Date pickers emit Javascript Date instances and
these get converted to datetime strings with timezone info.

Ex. a user in UTC+9 timezone picks some date (say July 1).
The underlying Date object gets converted to a string
that uses UTC+0 as the default timezone and the date may
change becuase of this conversion:

'2021-07-01 UTC+9 Korean Standard Time'
=> '2021-06-30T??:??:??Z'

Changelog: fixed
EE: true