tz-trout

Timezone Trout

This library tries to solve the common problem of figuring out what time zone a specific address or a phone number is in. It does so by using several mappings that are generated with the help of pytz, Geonames.org, and TimezoneFinder

Current version is fairly accurate for the United States, Canada, Australia, and countries which fit within a single time zone.

Vocabulary used in this library:

• PST - time zone name
• America/Los_Angeles - time zone identifier
• UTC-07:00 or -420 - UTC offset (the latter given in minutes)
• DST - Daylight Saving Time

The US Zipcode data is provided by www.geonames.org under the Creative Commons Attribution 3.0 License.

Starting in v1.0.0, this library requires Python version 3.6 or above.

Examples

>>> tztrout.tz_ids_for_phone('[phone]')
[u'America/Los_Angeles']
>>> tztrout.tz_ids_for_phone('[phone]')
[u'Europe/Berlin', u'Europe/Busingen']

>>> tztrout.tz_ids_for_address('US', state='CA')
[u'America/Los_Angeles']
>>> tztrout.tz_ids_for_address('PL')
[u'Europe/Warsaw']
>>> tztrout.tz_ids_for_address('CN')
[
    u'Asia/Shanghai',
    u'Asia/Harbin',
    u'Asia/Chongqing',
    u'Asia/Urumqi',
    u'Asia/Kashgar'
]

>>> import tztrout
>>> tztrout.tz_ids_for_tz_name('PDT')  # ran during DST
[
    u'America/Dawson',
    u'America/Los_Angeles',
    u'America/Santa_Isabel',
    u'America/Tijuana',
    u'America/Vancouver',
    u'America/Whitehorse',
    u'Canada/Pacific',
    u'US/Pacific'
]
>>> tztrout.tz_ids_for_tz_name('PDT')  # ran outside of the DST period
[]

>>> tztrout.local_time_for_phone('[phone]')
datetime.datetime(2013, 9, 16, 17, 45, 43, 0000000, tzinfo=<DstTzInfo 'America/Los_Angeles' PDT-1 day, 17:00:00 DST>)

>>> tztrout.local_time_for_phone('[phone])
datetime.datetime(2013, 9, 17, 2, 45, 43, 0000000, tzinfo=<DstTzInfo 'Europe/Warsaw' CEST+2:00:00 DST>)

>>> tztrout.local_time_for_address('US', state='CA')
datetime.datetime(2013, 9, 16, 17, 45, 43, 0000000, tzinfo=<DstTzInfo 'America/Los_Angeles' PDT-1 day, 17:00:00 DST>)
>>> tztrout.local_time_for_address('PL')
datetime.datetime(2013, 9, 17, 2, 45, 43, 0000000, tzinfo=<DstTzInfo 'Europe/Warsaw' CEST+2:00:00 DST>)

>>> tztrout.tz_ids_for_offset(-7 * 60)  # during DST
[
    u'America/Creston',
    u'America/Dawson',
    u'America/Dawson_Creek',
    u'America/Hermosillo',
    u'America/Los_Angeles',
    u'America/Phoenix',
    u'America/Santa_Isabel',
    u'America/Tijuana',
    u'America/Vancouver',
    u'America/Whitehorse',
    u'Canada/Pacific',
    u'US/Arizona',
    u'US/Pacific'
]
>>> tztrout.tz_ids_for_offset(+2 * 60)  # during DST
[
    "Africa/Blantyre",
    "Africa/Bujumbura",
    "Africa/Cairo",
    "Africa/Ceuta",
    "Africa/Gaborone",
    "Africa/Harare",
    "Africa/Johannesburg",
    "Africa/Kigali",
    "Africa/Lubumbashi",
    "Africa/Lusaka",
    "Africa/Maputo",
    "Africa/Maseru",
    "Africa/Mbabane",
    "Africa/Tripoli",
    "Africa/Windhoek",
    "Arctic/Longyearbyen",
    "Europe/Amsterdam",
    "Europe/Andorra",
    "Europe/Belgrade",
    "Europe/Berlin",
    "Europe/Bratislava",
    "Europe/Brussels",
    "Europe/Budapest",
    "Europe/Busingen",
    "Europe/Copenhagen",
    "Europe/Gibraltar",
    "Europe/Ljubljana",
    "Europe/Luxembourg",
    "Europe/Madrid",
    "Europe/Malta",
    "Europe/Monaco",
    "Europe/Oslo",
    "Europe/Paris",
    "Europe/Podgorica",
    "Europe/Prague",
    "Europe/Rome",
    "Europe/San_Marino",
    "Europe/Sarajevo",
    "Europe/Skopje",
    "Europe/Stockholm",
    "Europe/Tirane",
    "Europe/Vaduz",
    "Europe/Vatican",
    "Europe/Vienna",
    "Europe/Warsaw",
    "Europe/Zagreb",
    "Europe/Zurich"
]

Testing

Just run pytest

Regenerating the data

Time zones, addresses, and phone numbers are in a constant flux and hence the data used by this library needs to be regenerated periodically. To do so, upgrade the pytz and timezonefinder dependencies, and run python regenerate_data.py. If this doesn't fix the problem, consider opening an issue or adding an exception in data_exceptions.py.

Known Issues

• Australian Central Western Standard Time (CWST) is treated as Australian Central Standard Time (ACST). See Australian anomalies for more details.
• Lord Howe Standard Time (LHST) is treated as Australian Eastern Standard Time (AEST). In reality, they're 30 minutes apart.
• The whole state of British Columbia (Canada) is recognized as Pacific Time, although a small portion of its south-east territory should be recognized as Mountain Time.
• The whole state of Ontario (Canada) is recognized as Eastern Time, although a small portion of its west territory should be recognized as Central Time.
• All +1 867 phone numbers are recognized as Mountain Time, although this prefix is shared by three Canadian territories in the Arctic far north, spanning across Pacific, Mountain, and Central Time.

Releasing a New Version

1. Make sure the code has been thoroughly reviewed and tested in a realistic production environment.
2. Update setup.py and CHANGELOG.md. Make sure you include any breaking changes.
3. Run python setup.py sdist and twine upload dist/<PACKAGE_TO_UPLOAD>.
4. Push a new tag pointing to the released commit, format: v0.13 for example.