Extracted the checking for timezone offset

lib/index.js

@@ -547,7 +547,7 @@ Utils.parseDateTimeField = function(field, options) {
   if (SugarDate.isValid(parsedDateWithTimezone)) {
     Utils.Logger.debug('Utils.parseDateTimeField: parsedDateWithTimezone:', parsedDateWithTimezone.toISOString());
 
-    var hasTZOffset = new RegExp('[zZ]|[+-][01]\d:?[0-5]\d').test(field);
+    var hasTZOffset = Utils.hasTZOffset(field);
 
     // Convert to string. Important to remove offset/tz info (if none was provided originally)
     //  or moment will ignore the passed in tz in later step.
@@ -566,6 +566,21 @@ Utils.parseDateTimeField = function(field, options) {
   return rtnObject;
 };
 
+
+/**
+ * Utils.hasTZOffset - Checks to see if the string has a timezone offset
+ * Examples
+ * - `-06:00`
+ * - `+0600`
+ * - `Z`
+ *
+ * @param  {String} str The date string to be checked
+ * @return {Boolean}    true or false
+ */
+Utils.hasTZOffset = function(str) {
+  return new RegExp('[zZ]|[+-][01]\d:?[0-5]\d').test(str);
+};
+
 /**
  * Parses a boolean-ish input into a boolean object.
  *