Parse error when time is before 1000-01-01

[PengJiyuan]

trafficstars

Describe the bug

dayjs('0001-01-01').format('YYYY-MM-DD') // 1901-01-01
dayjs('1-01-01').format('YYYY-MM-DD') // 2001-01-01

So who knows how to parse 0001-01-01 or -0001-01-01.

Expected behavior

dayjs('0001-01-01').format('YYYY-MM-DD') // 0001-01-01

Information

• Day.js Version：v1.10.7
• OS: Mac
• Browser: Chrome
• Time zone: GMT+08:00

[cl-parsons]

Confirming this bug

• Node v16.17.0
• DayJS : 1.11.5

You can fix by specifying the time :

> dayjs('0001').format('YYYY-MM-DD')
'1901-01-01'
> dayjs('0001-01').format('YYYY-MM-DD')
'1901-01-01'
> dayjs('0001-01-01').format('YYYY-MM-DD')
'1901-01-01'
> dayjs('0001-01-01t').format('YYYY-MM-DD')
'1901-01-01'
> dayjs('0001-01-01t00').format('YYYY-MM-DD')
'1901-01-01'
> dayjs('0001-01-01t00:00').format('YYYY-MM-DD')
'1901-01-01'
> dayjs('0001-01-01t00:00:00').format('YYYY-MM-DD')
'1901-01-01'
> dayjs('0001-01-01t00:00:00z').format('YYYY-MM-DD')
'1-01-01'
> dayjs('0001-01-01z').format('YYYY-MM-DD')
'2001-01-01'

[adrigardi90]

Same error here (v1.11.5, Chrome). Trying to display year 0001 and always getting 1901 instead

It should be able to parse it accordingly (as momentJS does) dayjs('0001-01-01').format('YYYY-MM-DD') -> 0001-01-01