Date picker is inconsistent (and sometimes wrong)

[iffy]

[iffy]

Imported from https://trello.com/c/bDbNumyY

• copy over comments

[iffy]

Not completely solved:

...when it’s on the evening for me (China) and I validate some posted date, it will register that date -1.
For example, if I register something today : I pick 26th on date picker, when I validate it will register as 25th…

From the logs:

(main) Local time: 2018-04-18T09:19:14-05:00
(main)   UTC time: 2018-04-18T14:19:14Z
(main) Timezone: America/Chicago
(budget.r)   localNow(): 2018-04-18T09:19:16-05:00
(budget.r)     utcNow(): 2018-04-18T14:19:16Z
(budget.r)          toString: Wed Apr 18 2018 22:19:16 GMT+0800 (CST)
(budget.r)    toLocaleString: 4/18/2018, 10:19:16 PM
(budget.r) getTimezoneOffset: -480
(budget.r) moment: 2.18.1

• moment guesses that the timezone is America/Chicago which is UTC-5 or UTC-6
• getTimezoneOffset is -8 (-480/60) (the sign on this is backward)
• toString() reports the timezone as CST (China Standard Time) which is +8

So I guess the problem is that moment guesses that CST is Central Standard Time (in the US) instead of China?

[iffy]

I think this is related: moment/moment-timezone#517

[iffy]

Included in v0.42.0 release (AUTOMATED COMMENT)