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try:
import zoneinfo
except ImportError:
from backports import zoneinfo
from dateutil.zoneinfo import get_zonefile_instance
def make_full_tz_list():
dateutil_zones = set(get_zonefile_instance().zones)
zoneinfo_zones = set(zoneinfo.available_timezones())
# Since the tests create ZoneInfo objects, we can only use timezones
# that are available in zoneinfo. Filter out any dateutil-only timezones
# that are not available in zoneinfo (like Asia/Hanoi which was renamed to Asia/Ho_Chi_Minh)
all_zones = dateutil_zones.union(zoneinfo_zones)
return {tz for tz in all_zones if tz in zoneinfo_zones}
def assert_datetime_equality(dt1, dt2, within=10):
# Compare timezone behavior instead of object identity for cross-platform compatibility
assert_timezone_equivalence(dt1.tzinfo, dt2.tzinfo, dt1)
assert abs((dt1 - dt2).total_seconds()) < within
def assert_timezone_equivalence(tz1, tz2, dt):
# Timezone objects are equivalent
if tz1 == tz2:
return
# Compare timezone names
assert tz1.tzname(dt) == tz2.tzname(dt)
# Compare UTC offset and DST behavior at the given datetime
assert tz1.utcoffset(dt) == tz2.utcoffset(
dt
), f"UTC offset mismatch: {tz1.utcoffset(dt)} != {tz2.utcoffset(dt)}"
assert tz1.dst(dt) == tz2.dst(dt), f"DST mismatch: {tz1.dst(dt)} != {tz2.dst(dt)}"
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