Year addition perform unexpected result when value is a multiple of 5

[YixiongJiang]

const date = spacetime('2000-01-01 00:00:00');
expect(date.add(30, 'year').format(DateFormat.YYYY_MM_DD_HH_MM_SS)).toBe('2030-01-01 00:00:00');

Expected: "2030-01-01 00:00:00"
Received: "2029-01-01 00:00:00"

It happens when unit is year and when the value is a multiple of 5.

Just curiosity, why not just add value to the year numerically?

[spencermountain]

thanks @YixiongJiang good find. I'll check it out.
cheers

[YixiongJiang]

@spencermountain Thanks, for your more information, I found there is a workaround to avoid this bug:
date.add(30*12, 'month'),
will get correct result: "2030-01-01 00:00:00"

[spencermountain]

yikes! will add this to the next release, ideally next week.
thank you

[spencermountain]

fixed in v6.16.3 - thank you!