diff --git a/src/plugin/customParseFormat/index.js b/src/plugin/customParseFormat/index.js
index a210b53ff..ab09179d4 100644
--- a/src/plugin/customParseFormat/index.js
+++ b/src/plugin/customParseFormat/index.js
@@ -159,9 +159,9 @@ const parseFormattedInput = (input, format, utc) => {
       ) + (zone.offset * 60 * 1000))
     }
     const now = new Date()
+    const d = day || ((!year && !month) ? now.getDate() : 1)
     const y = year || now.getFullYear()
     const M = month > 0 ? month - 1 : now.getMonth()
-    const d = day || now.getDate()
     const h = hours || 0
     const m = minutes || 0
     const s = seconds || 0
diff --git a/test/plugin/customParseFormat.test.js b/test/plugin/customParseFormat.test.js
index 43e909b58..cafb94afd 100644
--- a/test/plugin/customParseFormat.test.js
+++ b/test/plugin/customParseFormat.test.js
@@ -161,6 +161,10 @@ it('return Invalid Date when parse corrupt short string', () => {
   expect(dayjs(input, format).format()).toBe('Invalid Date')
 })
 
+it('YYYY-MM set 1st day of the month', () => {
+  expect(dayjs('2019-02', 'YYYY-MM').format('YYYY-MM-DD')).toBe('2019-02-01')
+})
+
 it('Invalid Dates', () => {
   expect(dayjs('10/12/2014', 'YYYY-MM-DD').format('MM-DD-YYYY')).toBe('Invalid Date')
   expect(dayjs('10-12-2014', 'YYYY-MM-DD').format('MM-DD-YYYY')).toBe('Invalid Date')