# Copyright (c) 2019, MD2K Center of Excellence
# - Nasir Ali <nasir.ali08@gmail.com>
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import datetime as dt
import pytz
[docs]def get_timezone(tz_offset:float, common_only:bool=False):
"""
Returns a timezone for a given offset in milliseconds
Args:
tz_offset (float): in milliseconds
common_only (bool):
Returns:
str: timezone of an offset
"""
if tz_offset is None or tz_offset=="":
raise ValueError("Offset cannot be None or empty.")
# pick one of the timezone collections
timezones = pytz.common_timezones if common_only else pytz.all_timezones
# convert the milliseconds offset to a timedelta
offset_days, offset_seconds = 0, int(tz_offset/1000)
if offset_seconds < 0:
offset_days = -1
offset_seconds += 24 * 3600
desired_delta = dt.timedelta(offset_days, offset_seconds)
# Loop through the timezones and find any with matching offsets
null_delta = dt.timedelta(0, 0)
results = ""
for tz_name in timezones:
tz = pytz.timezone(tz_name)
non_dst_offset = getattr(tz, '_transition_info', [[null_delta]])[-1]
if desired_delta == non_dst_offset[0]:
return tz_name
return results