gocron v2's WithLocation is a SchedulerOption (process-wide), not a
JobOption — there's no per-job location knob. To get per-user
timezones we use a cron expression with the CRON_TZ= prefix, which
the underlying robfig/cron parser honors:
CRON_TZ=America/New_York 0 3 * * *
Fires at 03:00 in the named zone every day. Same DST-correctness as
the original WithLocation approach.
Fall-back to UTC moves inline (was validateTimezoneOrUTC); kept the
helper because the test file still exercises it.
Caught by go vet on CI after slice 2 pushed:
"cannot use gocron.WithLocation(loc) (value of type
gocron.SchedulerOption) as gocron.JobOption value"
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
c2168afbf0