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fix(customParseFormat): preserve UTC mode when format is an array #3023

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fix(customParseFormat): preserve UTC mode when format is an array #3023

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ccc9ec2
fix(customParseFormat): preserve UTC mode when format is an array
Jadu07 Mar 15, 2026
d3ca9c4
Merge branch 'dev' into fix/utc-custom-parse-format-array-format
Jadu07 Mar 16, 2026
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4 changes: 3 additions & 1 deletion src/plugin/customParseFormat/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -256,7 +256,9 @@ export default (o, C, d) => {
args[1] = format[i - 1]
const result = d.apply(this, args)
if (result.isValid()) {
this.$d = result.$d
this.$d = utc
? parseFormattedInput(date, format[i - 1], utc, d)
: result.$d
this.$L = result.$L
this.init()
break
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20 changes: 20 additions & 0 deletions test/plugin/utc.test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -219,6 +219,26 @@ describe('UTC with customParseFormat', () => {
expect(instant.format()).toBe('2011-02-02T03:04:05Z')
expect(instant.format()).toBe(momentInstant.format())
})

it('Array format - parses in UTC, not local time', () => {
dayjs.extend(customParseFormat)
const date = '1995-05-01'
const formats = ['YYYY-MM-DD', 'YYYY-M-D']
const result = dayjs.utc(date, formats)
expect(result.isValid()).toBe(true)
expect(result.toISOString()).toBe('1995-05-01T00:00:00.000Z')
expect(result.isUTC()).toBe(true)
})

it('Array format - second format matches, parsed in UTC', () => {
dayjs.extend(customParseFormat)
const date = '1995-5-1'
const formats = ['YYYY-MM-DD', 'YYYY-M-D']
const result = dayjs.utc(date, formats)
expect(result.isValid()).toBe(true)
expect(result.toISOString()).toBe('1995-05-01T00:00:00.000Z')
expect(result.isUTC()).toBe(true)
})
})

describe('UTC Offset', () => {
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