Use time zone settings in Jint when parsing dates

[Piedone]

Is your feature request related to a problem? Please describe.

When parsing JS, Jint can use a configured time zone for datetime operations. We don't do that though, so datetime operations will use something else (I don't really know, some default, perhaps?).

Describe the solution you'd like

There's an abandoned PR for this that might be a suitable start: #9650. However, it shouldn't use sync-over-async, to begin with.

Describe alternatives you've considered

Can't add anything else.