Inconsistent diff

[risentveber]

Describe the bug
Inconsistent diff behaviour if timezones are different.

To Reproduce

n = moment()
moment("2021-03-14T16:20:43.308Z").diff(n, 'days', true) // 5.0297781
moment("2021-03-14T16:20:43.308Z").diff(n, 'seconds', true) / 3600 / 24 // 4.98811152

Expected behavior
Bad precision it's about 1%

Moment version 2.29.1
Browser version Mozilla/5.0 (Macintosh; Intel Mac OS X 11_2_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.192 Safari/537.36

[risentveber]

I think the problem is in zoneDelta

moment/src/lib/moment/diff.js

Line 33 in f5233ee

output = (this - that) / 1e3;

vs

moment/src/lib/moment/diff.js

Line 42 in f5233ee

output = (this - that - zoneDelta) / 864e5;

(edited)