The Read/Show instances for TimeZone are misleading about time HOT 7 CLOSED

Can you reproduce this? It should recognise any time zone in the knownTimeZones field of the TimeLocale you are passing in.

from time.

Hmm, for read, where you don't pass in a TimeLocale, it should recognise the time-zones in defaultTimeLocale.

from time.

Closing this as not reproducible.

from time.

λ> getZonedTime
2018-11-23 16:14:00.94267804 MSK
λ> ct <- getZonedTime
λ> timeZoneMinutes $ zonedTimeZone ct
180
λ> timeZoneMinutes $ zonedTimeZone $ read "2018-11-23 16:14:00.94267804 MSK"
0

This sucks, since x ≠ read $ show x.
How do i read ZonedTime correctly?

from time.

λ> read "2018-11-23 02:43:56.725423116 MSK" :: ZonedTime
2018-11-23 02:43:56.725423116 MSK
λ> zonedTimeToUTC $ read "2018-11-23 02:43:56.725423116 MSK"
2018-11-23 02:43:56.725423116 UTC

from time.

Hmm, the problem is that show outputs the time-zone name, but not the actual offset in minutes. And the name (e.g., MSK) is insufficient to determine the offset. So it loses information that read cannot recover. This means that x ≠ read $ show x. I'm not sure how or whether to fix this.

To read ZonedTime, use parseTimeM. If you have a set of named time-zones, put them in knownTimeZones, and parseTimeM will match against them along with the standard ones.

from time.

OK, added documentation about this.

from time.