diff --git a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoAbbreviatedDayNames.cs b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoAbbreviatedDayNames.cs
index e8a0c1d46e68f..463b1c64779d0 100644
--- a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoAbbreviatedDayNames.cs
+++ b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoAbbreviatedDayNames.cs
@@ -37,10 +37,7 @@ public static IEnumerable<object[]> AbbreviatedDayNames_Get_TestData_HybridGloba
             yield return new object[] { "bn-BD", new string[] { "রবি", "সোম", "মঙ্গল", "বুধ", "বৃহস্পতি", "শুক্র", "শনি" } };
             yield return new object[] { "ca-AD", new string[] { "dg.", "dl.", "dt.", "dc.", "dj.", "dv.", "ds." } };
             yield return new object[] { "cs-CZ", new string[] { "ne", "po", "út", "st", "čt", "pá", "so" } };
-            var danishDays = PlatformDetection.IsNodeJSOnWindows ?
-                new string[] { "søn", "man", "tir", "ons", "tor", "fre", "lør" } :
-                new string[] { "søn.", "man.", "tirs.", "ons.", "tors.", "fre.", "lør." }; // like ICU
-            yield return new object[] { "da-DK", danishDays };
+            yield return new object[] { "da-DK", new string[] { "søn.", "man.", "tirs.", "ons.", "tors.", "fre.", "lør." } };
             yield return new object[] { "de-DE", new string[] { "So", "Mo", "Di", "Mi", "Do", "Fr", "Sa" } };
             yield return new object[] { "el-GR", new string[] { "Κυρ", "Δευ", "Τρί", "Τετ", "Πέμ", "Παρ", "Σάβ" } };
             yield return new object[] { "en-CA", new string[] { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" } }; // should be with dots
diff --git a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoAbbreviatedMonthGenitiveNames.cs b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoAbbreviatedMonthGenitiveNames.cs
index 8bc889ce04108..0330708cdc97a 100644
--- a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoAbbreviatedMonthGenitiveNames.cs
+++ b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoAbbreviatedMonthGenitiveNames.cs
@@ -14,14 +14,8 @@ public static IEnumerable<object[]> AbbreviatedMonthGenitiveNames_Get_TestData_H
             yield return new object[] { "ar-SA", new string[] { "محرم", "صفر", "ربيع الأول", "ربيع الآخر", "جمادى الأولى", "جمادى الآخرة", "رجب", "شعبان", "رمضان", "شوال", "ذو القعدة", "ذو الحجة", "" } };
             yield return new object[] { "am-ET", new string[] { "ጃንዩ", "ፌብሩ", "ማርች", "ኤፕሪ", "ሜይ", "ጁን", "ጁላይ", "ኦገስ", "ሴፕቴ", "ኦክቶ", "ኖቬም", "ዲሴም", "" } };
             yield return new object[] { "bg-BG", new string[] { "01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "" } }; //"яну", "фев", "март", "апр", "май", "юни", "юли", "авг", "сеп", "окт", "ное", "дек", ""
-            var banglaMonths = PlatformDetection.IsNodeJSOnWindows ?
-                new string[] { "জানু", "ফেব", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেম্বর", "অক্টোবর", "নভেম্বর", "ডিসেম্বর", "" } : // same as ICU
-                new string[] { "জানু", "ফেব", "মার্চ", "এপ্রি", "মে", "জুন", "জুল", "আগ", "সেপ", "অক্টো", "নভে", "ডিসে", "" };
-            yield return new object[] { "bn-BD", banglaMonths };
-            var bengaliMonths = PlatformDetection.IsNodeJSOnWindows ?
-                new string[] { "জানু", "ফেব", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেম্বর", "অক্টোবর", "নভেম্বর", "ডিসেম্বর", "" } : // same as ICU
-                new string[] { "জানু", "ফেব", "মার্চ", "এপ্রি", "মে", "জুন", "জুল", "আগ", "সেপ্টেঃ", "অক্টোঃ", "নভেঃ", "ডিসেঃ", "" };
-            yield return new object[] { "bn-IN", bengaliMonths }; // "জানু", "ফেব", "মার্চ", "এপ্রি", "মে", "জুন", "জুল", "আগ", "সেপ্টেঃ", "অক্টোঃ", "নভেঃ", "ডিসেঃ", "" } }; // "জানু", "ফেব", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেম্বর", "অক্টোবর", "নভেম্বর", "ডিসেম্বর", ""
+            yield return new object[] { "bn-BD", new string[] { "জানু", "ফেব", "মার্চ", "এপ্রি", "মে", "জুন", "জুল", "আগ", "সেপ", "অক্টো", "নভে", "ডিসে", "" } }; //  "জানু", "ফেব", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেম্বর", "অক্টোবর", "নভেম্বর", "ডিসেম্বর", ""
+            yield return new object[] { "bn-IN", new string[] { "জানু", "ফেব", "মার্চ", "এপ্রি", "মে", "জুন", "জুল", "আগ", "সেপ্টেঃ", "অক্টোঃ", "নভেঃ", "ডিসেঃ", "" } }; //  "জানু", "ফেব", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেম্বর", "অক্টোবর", "নভেম্বর", "ডিসেম্বর", ""
             yield return new object[] { "ca-AD", new string[] { "gen.", "febr.", "març", "abr.", "maig", "juny", "jul.", "ag.", "set.", "oct.", "nov.", "des.", "" } }; // "de gen.", "de febr.", "de març", "d’abr.", "de maig", "de juny", "de jul.", "d’ag.", "de set.", "d’oct.", "de nov.", "de des.", ""
             yield return new object[] { "ca-ES", new string[] { "gen.", "febr.", "març", "abr.", "maig", "juny", "jul.", "ag.", "set.", "oct.", "nov.", "des.", "" } };
             yield return new object[] { "cs-CZ", new string[] { "led", "úno", "bře", "dub", "kvě", "čvn", "čvc", "srp", "zář", "říj", "lis", "pro", "" } };
@@ -48,10 +42,7 @@ public static IEnumerable<object[]> AbbreviatedMonthGenitiveNames_Get_TestData_H
             yield return new object[] { "en-BS", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
             yield return new object[] { "en-BW", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
             yield return new object[] { "en-BZ", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
-            var canadianMonths = PlatformDetection.IsNodeJSOnWindows ?
-                new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } :
-                new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "" };
-            yield return new object[] { "en-CA", canadianMonths }; // "Jan.", "Feb.", "Mar.", "Apr.", "May", "Jun.", "Jul.", "Aug.", "Sep.", "Oct.", "Nov.", "Dec.", ""
+            yield return new object[] { "en-CA", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "" } }; // "Jan.", "Feb.", "Mar.", "Apr.", "May", "Jun.", "Jul.", "Aug.", "Sep.", "Oct.", "Nov.", "Dec.", ""
             yield return new object[] { "en-CC", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
             yield return new object[] { "en-CH", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
             yield return new object[] { "en-CK", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
@@ -161,10 +152,7 @@ public static IEnumerable<object[]> AbbreviatedMonthGenitiveNames_Get_TestData_H
             yield return new object[] { "it-CH", new string[] { "gen", "feb", "mar", "apr", "mag", "giu", "lug", "ago", "set", "ott", "nov", "dic", "" } };
             yield return new object[] { "it-IT", new string[] { "gen", "feb", "mar", "apr", "mag", "giu", "lug", "ago", "set", "ott", "nov", "dic", "" } };
             yield return new object[] { "ja-JP", new string[] { "1月", "2月", "3月", "4月", "5月", "6月", "7月", "8月", "9月", "10月", "11月", "12月", "" } };
-            var kannadaMonths = PlatformDetection.IsNodeJSOnWindows ?
-                new string[] { "ಜನವರಿ", "ಫೆಬ್ರವರಿ", "ಮಾರ್ಚ್", "ಏಪ್ರಿ", "ಮೇ", "ಜೂನ್", "ಜುಲೈ", "ಆಗ", "ಸೆಪ್ಟೆಂ", "ಅಕ್ಟೋ", "ನವೆಂ", "ಡಿಸೆಂ", "" } : // same as ICU
-                new string[] { "ಜನವರಿ", "ಫೆಬ್ರವರಿ", "ಮಾರ್ಚ್", "ಏಪ್ರಿ", "ಮೇ", "ಜೂನ್", "ಜುಲೈ", "ಆಗಸ್ಟ್", "ಸೆಪ್ಟೆಂ", "ಅಕ್ಟೋ", "ನವೆಂ", "ಡಿಸೆಂ", "" };
-            yield return new object[] { "kn-IN", kannadaMonths };
+            yield return new object[] { "kn-IN", new string[] { "ಜನವರಿ", "ಫೆಬ್ರವರಿ", "ಮಾರ್ಚ್", "ಏಪ್ರಿ", "ಮೇ", "ಜೂನ್", "ಜುಲೈ", "ಆಗಸ್ಟ್", "ಸೆಪ್ಟೆಂ", "ಅಕ್ಟೋ", "ನವೆಂ", "ಡಿಸೆಂ", "" } }; // "ಜನವರಿ", "ಫೆಬ್ರವರಿ", "ಮಾರ್ಚ್", "ಏಪ್ರಿ", "ಮೇ", "ಜೂನ್", "ಜುಲೈ", "ಆಗ", "ಸೆಪ್ಟೆಂ", "ಅಕ್ಟೋ", "ನವೆಂ", "ಡಿಸೆಂ", ""
             yield return new object[] { "ko-KR", new string[] { "1월", "2월", "3월", "4월", "5월", "6월", "7월", "8월", "9월", "10월", "11월", "12월", "" } };
             yield return new object[] { "lt-LT", new string[] { "01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "" } }; // "saus.", "vas.", "kov.", "bal.", "geg.", "birž.", "liep.", "rugp.", "rugs.", "spal.", "lapkr.", "gruod."
             yield return new object[] { "lv-LV", new string[] { "janv.", "febr.", "marts", "apr.", "maijs", "jūn.", "jūl.", "aug.", "sept.", "okt.", "nov.", "dec.", "" } };
@@ -173,14 +161,10 @@ public static IEnumerable<object[]> AbbreviatedMonthGenitiveNames_Get_TestData_H
             yield return new object[] { "ms-BN", new string[] { "Jan", "Feb", "Mac", "Apr", "Mei", "Jun", "Jul", "Ogo", "Sep", "Okt", "Nov", "Dis", "" } };
             yield return new object[] { "ms-MY", new string[] { "Jan", "Feb", "Mac", "Apr", "Mei", "Jun", "Jul", "Ogo", "Sep", "Okt", "Nov", "Dis", "" } };
             yield return new object[] { "ms-SG", new string[] { "Jan", "Feb", "Mac", "Apr", "Mei", "Jun", "Jul", "Ogo", "Sep", "Okt", "Nov", "Dis", "" } };
-            string[] norwegianMonths = PlatformDetection.IsNodeJSOnWindows ?
-                new string [] { "jan.", "feb.", "mar.", "apr.", "mai", "jun.", "jul.", "aug.", "sep.", "okt.", "nov.", "des.", "" } : // same as ICU
-                new string [] { "jan.", "feb.", "mars", "apr.", "mai", "juni", "juli", "aug.", "sep.", "okt.", "nov.", "des.", "" };
+            string[] norwegianMonths = new string [] { "jan.", "feb.", "mars", "apr.", "mai", "juni", "juli", "aug.", "sep.", "okt.", "nov.", "des.", "" }; // "jan.", "feb.", "mar.", "apr.", "mai", "jun.", "jul.", "aug.", "sep.", "okt.", "nov.", "des.", "
             yield return new object[] { "nb-NO", norwegianMonths };
             yield return new object[] { "no-NO", norwegianMonths };
-            string[] dutchMonths = PlatformDetection.IsNodeJSOnWindows ?
-                new string[] { "jan.", "feb.", "mrt.", "apr.", "mei", "jun.", "jul.", "aug.", "sep.", "okt.", "nov.", "dec.", "" } : // same as ICU
-                new string[] { "jan", "feb", "mrt", "apr", "mei", "jun", "jul", "aug", "sep", "okt", "nov", "dec", "" };
+            string[] dutchMonths = new string[] { "jan", "feb", "mrt", "apr", "mei", "jun", "jul", "aug", "sep", "okt", "nov", "dec", "" }; // "jan.", "feb.", "mrt.", "apr.", "mei", "jun.", "jul.", "aug.", "sep.", "okt.", "nov.", "dec.", ""
             yield return new object[] { "nl-AW", dutchMonths };
             yield return new object[] { "nl-BE", dutchMonths };
             yield return new object[] { "nl-NL", dutchMonths };
diff --git a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoAbbreviatedMonthNames.cs b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoAbbreviatedMonthNames.cs
index 9cae2ffbfb0d6..4687babcb259a 100644
--- a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoAbbreviatedMonthNames.cs
+++ b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoAbbreviatedMonthNames.cs
@@ -34,14 +34,8 @@ public static IEnumerable<object[]> AbbreviatedMonthNames_Get_TestData_HybridGlo
             yield return new object[] { "ar-SA", new string[] { "محرم", "صفر", "ربيع الأول", "ربيع الآخر", "جمادى الأولى", "جمادى الآخرة", "رجب", "شعبان", "رمضان", "شوال", "ذو القعدة", "ذو الحجة", "" } };
             yield return new object[] { "am-ET", new string[] { "ጃንዩ", "ፌብሩ", "ማርች", "ኤፕሪ", "ሜይ", "ጁን", "ጁላይ", "ኦገስ", "ሴፕቴ", "ኦክቶ", "ኖቬም", "ዲሴም", "" } };
             yield return new object[] { "bg-BG", new string[] { "01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "" } }; // "яну", "фев", "март", "апр", "май", "юни", "юли", "авг", "сеп", "окт", "ное", "дек", ""
-             var banglaMonths = PlatformDetection.IsNodeJSOnWindows ?
-                new string[] { "জানুয়ারী", "ফেব্রুয়ারী", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেম্বর", "অক্টোবর", "নভেম্বর", "ডিসেম্বর", "" } : // same as ICU
-                new string[] { "জানু", "ফেব", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেম্বর", "অক্টোবর", "নভেম্বর", "ডিসেম্বর", "" };
-            yield return new object[] { "bn-BD", banglaMonths };
-            var bengaliMonths = PlatformDetection.IsNodeJSOnWindows ?
-                new string[] { "জানুয়ারী", "ফেব্রুয়ারী", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেম্বর", "অক্টোবর", "নভেম্বর", "ডিসেম্বর", "" } : // same as ICU
-                new string[] { "জানু", "ফেব", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেঃ", "অক্টোঃ", "নভেঃ", "ডিসেঃ", "" }; // BUG. this response is Genitive even though we expect Nominative; "জানু", "ফেব", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেম্বর", "অক্টোবর", "নভেম্বর", "ডিসেম্বর", ""
-            yield return new object[] { "bn-IN", bengaliMonths };
+            yield return new object[] { "bn-BD", new string[] { "জানু", "ফেব", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেম্বর", "অক্টোবর", "নভেম্বর", "ডিসেম্বর", "" } }; // "জানুয়ারী", "ফেব্রুয়ারী", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেম্বর", "অক্টোবর", "নভেম্বর", "ডিসেম্বর", ""
+            yield return new object[] { "bn-IN", new string[] { "জানু", "ফেব", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেঃ", "অক্টোঃ", "নভেঃ", "ডিসেঃ", "" } }; // BUG. JS returns Genitive even though we expect Nominative; "জানু", "ফেব", "মার্চ", "এপ্রিল", "মে", "জুন", "জুলাই", "আগস্ট", "সেপ্টেম্বর", "অক্টোবর", "নভেম্বর", "ডিসেম্বর", ""
             yield return new object[] { "ca-AD", new string[] { "gen.", "febr.", "març", "abr.", "maig", "juny", "jul.", "ag.", "set.", "oct.", "nov.", "des.", "" } };
             yield return new object[] { "ca-ES", new string[] { "gen.", "febr.", "març", "abr.", "maig", "juny", "jul.", "ag.", "set.", "oct.", "nov.", "des.", "" } };
             yield return new object[] { "cs-CZ", new string[] { "led", "úno", "bře", "dub", "kvě", "čvn", "čvc", "srp", "zář", "říj", "lis", "pro", "" } };
@@ -60,10 +54,7 @@ public static IEnumerable<object[]> AbbreviatedMonthNames_Get_TestData_HybridGlo
             yield return new object[] { "en-AI", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
             yield return new object[] { "en-AS", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "" } };
             yield return new object[] { "en-AT", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
-            var australianMonths = PlatformDetection.IsNodeJSOnWindows ?
-                new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "" } :
-                new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" }; // same as ICU
-            yield return new object[] { "en-AU", australianMonths };
+            yield return new object[] { "en-AU", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } };
             yield return new object[] { "en-BB", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
             yield return new object[] { "en-BE", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
             yield return new object[] { "en-BI", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "" } };
@@ -71,10 +62,7 @@ public static IEnumerable<object[]> AbbreviatedMonthNames_Get_TestData_HybridGlo
             yield return new object[] { "en-BS", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
             yield return new object[] { "en-BW", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
             yield return new object[] { "en-BZ", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
-            var canadianMonths = PlatformDetection.IsNodeJSOnWindows ?
-                new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } :
-                new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "" };
-            yield return new object[] { "en-CA", canadianMonths }; // "Jan.", "Feb.", "Mar.", "Apr.", "May", "Jun.", "Jul.", "Aug.", "Sep.", "Oct.", "Nov.", "Dec.", ""
+            yield return new object[] { "en-CA", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "" } }; // "Jan.", "Feb.", "Mar.", "Apr.", "May", "Jun.", "Jul.", "Aug.", "Sep.", "Oct.", "Nov.", "Dec.", ""
             yield return new object[] { "en-CC", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
             yield return new object[] { "en-CH", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
             yield return new object[] { "en-CK", new string[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "" } }; // "Sep"
@@ -196,9 +184,7 @@ public static IEnumerable<object[]> AbbreviatedMonthNames_Get_TestData_HybridGlo
             yield return new object[] { "nb-NO", new string[] { "jan", "feb", "mar", "apr", "mai", "jun", "jul", "aug", "sep", "okt", "nov", "des", "" } };
             yield return new object[] { "no", new string[] { "jan", "feb", "mar", "apr", "mai", "jun", "jul", "aug", "sep", "okt", "nov", "des", "" } };
             yield return new object[] { "no-NO", new string[] { "jan", "feb", "mar", "apr", "mai", "jun", "jul", "aug", "sep", "okt", "nov", "des", "" } };
-            var dutchMonths = PlatformDetection.IsNodeJSOnWindows ?
-                new string[] { "jan.", "feb.", "mrt.", "apr.", "mei", "jun.", "jul.", "aug.", "sep.", "okt.", "nov.", "dec.", "" } : // same as ICU
-                new string[] { "jan", "feb", "mrt", "apr", "mei", "jun", "jul", "aug", "sep", "okt", "nov", "dec", "" };
+            var dutchMonths = new string[] { "jan", "feb", "mrt", "apr", "mei", "jun", "jul", "aug", "sep", "okt", "nov", "dec", "" }; // "jan.", "feb.", "mrt.", "apr.", "mei", "jun.", "jul.", "aug.", "sep.", "okt.", "nov.", "dec.", ""
             yield return new object[] { "nl-AW", dutchMonths };
             yield return new object[] { "nl-BE", dutchMonths };
             yield return new object[] { "nl-NL", dutchMonths };
diff --git a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoCalendarWeekRule.cs b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoCalendarWeekRule.cs
index 71fd47030b7bb..a9a8271aaeaff 100644
--- a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoCalendarWeekRule.cs
+++ b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoCalendarWeekRule.cs
@@ -176,9 +176,9 @@ public static IEnumerable<object[]> CalendarWeekRule_Get_TestData()
                 yield return new object[] { "ms-BN", CalendarWeekRule.FirstDay };
                 yield return new object[] { "ms-MY", CalendarWeekRule.FirstDay };
                 yield return new object[] { "ms-SG", CalendarWeekRule.FirstDay };
-                yield return new object[] { "nb-NO", PlatformDetection.IsNodeJSOnWindows ? CalendarWeekRule.FirstDay : CalendarWeekRule.FirstFourDayWeek };
+                yield return new object[] { "nb-NO", CalendarWeekRule.FirstFourDayWeek };
                 yield return new object[] { "no-NO", CalendarWeekRule.FirstFourDayWeek };
-                yield return new object[] { "nl-AW", PlatformDetection.IsNodeJSOnWindows ? CalendarWeekRule.FirstFourDayWeek : CalendarWeekRule.FirstDay };
+                yield return new object[] { "nl-AW", CalendarWeekRule.FirstDay };
                 yield return new object[] { "nl-BE", CalendarWeekRule.FirstFourDayWeek };
                 yield return new object[] { "nl-NL", CalendarWeekRule.FirstFourDayWeek };
                 yield return new object[] { "pl-PL", CalendarWeekRule.FirstFourDayWeek };
diff --git a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoDayNames.cs b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoDayNames.cs
index 55882acd9fc14..8f3e921169276 100644
--- a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoDayNames.cs
+++ b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoDayNames.cs
@@ -42,10 +42,7 @@ public static IEnumerable<object[]> DayNames_Get_TestData_HybridGlobalization()
             yield return new object[] { "es-419", new string[] { "domingo", "lunes", "martes", "miércoles", "jueves", "viernes", "sábado" } };
             yield return new object[] { "es-ES", new string[] { "domingo", "lunes", "martes", "miércoles", "jueves", "viernes", "sábado" } };
             yield return new object[] { "es-MX", new string[] { "domingo", "lunes", "martes", "miércoles", "jueves", "viernes", "sábado" } };
-            var estonianDays = PlatformDetection.IsNodeJSOnWindows ?
-                new string[] { "Pühapäev", "Esmaspäev", "Teisipäev", "Kolmapäev", "Neljapäev", "Reede", "Laupäev" } :
-                new string[] { "pühapäev", "esmaspäev", "teisipäev", "kolmapäev", "neljapäev", "reede", "laupäev" }; // same as ICU
-            yield return new object[] { "et-EE", estonianDays };
+            yield return new object[] { "et-EE", new string[] { "pühapäev", "esmaspäev", "teisipäev", "kolmapäev", "neljapäev", "reede", "laupäev" } };
             yield return new object[] { "fa-IR", new string[] { "یکشنبه", "دوشنبه", "سه‌شنبه", "چهارشنبه", "پنجشنبه", "جمعه", "شنبه" } };
             yield return new object[] { "fi-FI", new string[] { "sunnuntai", "maanantai", "tiistai", "keskiviikko", "torstai", "perjantai", "lauantai" } };
             yield return new object[] { "fil-PH", new string[] { "Linggo", "Lunes", "Martes", "Miyerkules", "Huwebes", "Biyernes", "Sabado" } };
diff --git a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoFirstDayOfWeek.cs b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoFirstDayOfWeek.cs
index 0b227146950c5..534f60f2d4406 100644
--- a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoFirstDayOfWeek.cs
+++ b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoFirstDayOfWeek.cs
@@ -41,7 +41,7 @@ public static IEnumerable<object[]> FirstDayOfWeek_Get_TestData_HybridGlobalizat
             yield return new object[] { "en-AI", DayOfWeek.Monday };
             yield return new object[] { "en-AS", DayOfWeek.Sunday };
             yield return new object[] { "en-AT", DayOfWeek.Monday };
-            yield return new object[] { "en-AU", PlatformDetection.IsNodeJSOnWindows ? DayOfWeek.Sunday : DayOfWeek.Monday }; // originally in ICU: Sunday, even though ISO 8601 states: Monday
+            yield return new object[] { "en-AU", DayOfWeek.Monday }; // originally in ICU: Sunday, even though ISO 8601 states: Monday
             yield return new object[] { "en-BB", DayOfWeek.Monday };
             yield return new object[] { "en-BE", DayOfWeek.Monday };
             yield return new object[] { "en-BI", DayOfWeek.Monday };
@@ -193,13 +193,13 @@ public static IEnumerable<object[]> FirstDayOfWeek_Get_TestData_HybridGlobalizat
             yield return new object[] { "ta-LK", DayOfWeek.Monday };
             yield return new object[] { "ta-MY", DayOfWeek.Monday };
             yield return new object[] { "ta-SG", DayOfWeek.Sunday };
-            yield return new object[] { "te-IN", PlatformDetection.IsNodeJSOnWindows ? DayOfWeek.Monday : DayOfWeek.Sunday };
+            yield return new object[] { "te-IN", DayOfWeek.Sunday };
             yield return new object[] { "th-TH", DayOfWeek.Sunday };
             yield return new object[] { "tr-CY", DayOfWeek.Monday };
             yield return new object[] { "tr-TR", DayOfWeek.Monday };
             yield return new object[] { "uk-UA", DayOfWeek.Monday };
             yield return new object[] { "vi-VN", DayOfWeek.Monday };
-            yield return new object[] { "zh-CN", PlatformDetection.IsNodeJSOnWindows ? DayOfWeek.Sunday : DayOfWeek.Monday };
+            yield return new object[] { "zh-CN", DayOfWeek.Monday };
             yield return new object[] { "zh-Hans-HK", DayOfWeek.Sunday };
             yield return new object[] { "zh-SG", DayOfWeek.Sunday };
             yield return new object[] { "zh-HK", DayOfWeek.Sunday };
diff --git a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoGetAbbreviatedEraName.cs b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoGetAbbreviatedEraName.cs
index 71d286cf1553f..0c23b33cdc1fb 100644
--- a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoGetAbbreviatedEraName.cs
+++ b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoGetAbbreviatedEraName.cs
@@ -23,7 +23,7 @@ public static IEnumerable<object[]> GetAbbreviatedEraName_TestData()
                 yield return new object[] { "am-ET", 1, "ዓ/ም" };
                 yield return new object[] { "bg-BG", 1, "сл.Хр." };
                 yield return new object[] { "bn-BD", 1, "খৃষ্টাব্দ" };
-                yield return new object[] { "bn-IN", 1, PlatformDetection.IsNodeJSOnWindows ? "খৃষ্টাব্দ" : "খ্রিঃ" }; // "খৃষ্টাব্দ"
+                yield return new object[] { "bn-IN", 1, "খ্রিঃ" }; // "খৃষ্টাব্দ"
                 yield return new object[] { "ca-AD", 1, "dC" };
                 yield return new object[] { "ca-ES", 1, "dC" };
                 yield return new object[] { "cs-CZ", 1, "n.l." };
@@ -140,8 +140,8 @@ public static IEnumerable<object[]> GetAbbreviatedEraName_TestData()
                 yield return new object[] { "en-ZM", 1, "A" }; // AD
                 yield return new object[] { "en-ZW", 1, "A" }; // AD
                 yield return new object[] { "es-ES", 1, "d. C." };
-                yield return new object[] { "es-419", 1, PlatformDetection.IsNodeJSOnWindows ? "d. C." : "d.C." }; // "d. C."
-                yield return new object[] { "es-MX", 1, PlatformDetection.IsNodeJSOnWindows ? "d. C." : "d.C." }; // "d. C."
+                yield return new object[] { "es-419", 1, "d.C." }; // "d. C."
+                yield return new object[] { "es-MX", 1, "d.C." }; // "d. C."
                 yield return new object[] { "et-EE", 1, "pKr" };
                 yield return new object[] { "fa-IR", 1, "ه.ش" }; // ه‍.ش.
                 yield return new object[] { "fi-FI", 1, "jKr" };
diff --git a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoGetEraName.cs b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoGetEraName.cs
index 93dda71911fe3..a2c69d95081ae 100644
--- a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoGetEraName.cs
+++ b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoGetEraName.cs
@@ -33,8 +33,8 @@ public static IEnumerable<object[]> GetEraName_TestData()
                 yield return new object[] { "bg-BG", 1, "сл.Хр." };
                 yield return new object[] { "bn-BD", 0, "খৃষ্টাব্দ" };
                 yield return new object[] { "bn-BD", 1, "খৃষ্টাব্দ" };
-                yield return new object[] { "bn-IN", 0, PlatformDetection.IsNodeJSOnWindows ? "খৃষ্টাব্দ" : "খ্রিঃ" };
-                yield return new object[] { "bn-IN", 1, PlatformDetection.IsNodeJSOnWindows ? "খৃষ্টাব্দ" : "খ্রিঃ" };
+                yield return new object[] { "bn-IN", 0, "খ্রিঃ" };
+                yield return new object[] { "bn-IN", 1, "খ্রিঃ" };
                 yield return new object[] { "ca-AD", 0, "dC" };
                 yield return new object[] { "ca-AD", 1, "dC" };
                 yield return new object[] { "ca-ES", 0, "dC" };
@@ -269,10 +269,10 @@ public static IEnumerable<object[]> GetEraName_TestData()
                 yield return new object[] { "en-US", 1, "AD" };
                 yield return new object[] { "es-ES", 0, "d. C." };
                 yield return new object[] { "es-ES", 1, "d. C." };
-                yield return new object[] { "es-419", 0, PlatformDetection.IsNodeJSOnWindows ? "d. C." : "d.C." };
-                yield return new object[] { "es-419", 1, PlatformDetection.IsNodeJSOnWindows ? "d. C." : "d.C." };
-                yield return new object[] { "es-MX", 0, PlatformDetection.IsNodeJSOnWindows ? "d. C." : "d.C." };
-                yield return new object[] { "es-MX", 1, PlatformDetection.IsNodeJSOnWindows ? "d. C." : "d.C." };
+                yield return new object[] { "es-419", 0, "d.C." };
+                yield return new object[] { "es-419", 1, "d.C." };
+                yield return new object[] { "es-MX", 0, "d.C." };
+                yield return new object[] { "es-MX", 1, "d.C." };
                 yield return new object[] { "et-EE", 0, "pKr" };
                 yield return new object[] { "et-EE", 1, "pKr" };
                 yield return new object[] { "fa-IR", 0, "ه.ش" }; // ه‍.ش.
@@ -387,8 +387,8 @@ public static IEnumerable<object[]> GetEraName_TestData()
                 yield return new object[] { "tr-TR", 1, "MS" };
                 yield return new object[] { "uk-UA", 0, "н. е." };
                 yield return new object[] { "uk-UA", 1, "н. е." };
-                yield return new object[] { "vi-VN", 0, PlatformDetection.IsNodeJSOnWindows ? "Sau CN" : "CN" }; // sau CN
-                yield return new object[] { "vi-VN", 1, PlatformDetection.IsNodeJSOnWindows ? "Sau CN" : "CN" }; // sau CN
+                yield return new object[] { "vi-VN", 0, "CN" }; // sau CN
+                yield return new object[] { "vi-VN", 1, "CN" }; // sau CN
                 yield return new object[] { "zh-CN", 0, "公元" };
                 yield return new object[] { "zh-CN", 1, "公元" };
                 yield return new object[] { "zh-Hans-HK", 0, "公元" };
diff --git a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoNativeCalendarName.cs b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoNativeCalendarName.cs
index a554b89fb1c30..86507dc1308f1 100644
--- a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoNativeCalendarName.cs
+++ b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoNativeCalendarName.cs
@@ -11,10 +11,10 @@ public class DateTimeFormatInfoNativeCalendarName
         public static IEnumerable<object[]> NativeCalendarName_Get_TestData_HybridGlobalization()
         {
             // see the comments on the right to check the non-Hybrid result, in this collection it always differs
-            string islamicName = PlatformDetection.IsNodeJSOnWindows ? "UMALQURA" : "islamic-umalqura";
-            string gregorianName = PlatformDetection.IsNodeJSOnWindows ? "GREGORIAN" : "gregory";
-            string persianName = PlatformDetection.IsNodeJSOnWindows ? "PERSIAN" : "persian";
-            string bhuddistName = PlatformDetection.IsNodeJSOnWindows ? "THAI" : "buddhist";
+            string islamicName = "islamic-umalqura";
+            string gregorianName = "gregory";
+            string persianName = "persian";
+            string bhuddistName = "buddhist";
             yield return new object[] { new CultureInfo("ar-SA").DateTimeFormat, islamicName }; // التقويم الإسلامي (أم القرى)
             yield return new object[] { new CultureInfo("am-ET").DateTimeFormat, gregorianName }; // የግሪጎሪያን የቀን አቆጣጠር
             yield return new object[] { new CultureInfo("bg-BG").DateTimeFormat, gregorianName }; // григориански календар
diff --git a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoShortDatePattern.cs b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoShortDatePattern.cs
index 6b18885611d80..dd601d0f9ffb9 100644
--- a/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoShortDatePattern.cs
+++ b/src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoShortDatePattern.cs
@@ -44,7 +44,7 @@ public static IEnumerable<object[]> ShortDatePattern_Get_TestData_HybridGlobaliz
             yield return new object[] { "en-BZ", "dd/MM/yyyy" };
             yield return new object[] { "en-CA", "yyyy-MM-dd" };
             yield return new object[] { "en-CC", "dd/MM/yyyy" };
-            yield return new object[] { "en-CH", PlatformDetection.IsNodeJSOnWindows ? "dd/MM/yyyy" : "dd.MM.yyyy" }; // "dd/MM/yyyy"
+            yield return new object[] { "en-CH", "dd.MM.yyyy" }; // "dd/MM/yyyy"
             yield return new object[] { "en-CK", "dd/MM/yyyy" };
             yield return new object[] { "en-CM", "dd/MM/yyyy" };
             yield return new object[] { "en-CX", "dd/MM/yyyy" };