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@RhetTbull
Last activeFebruary 3, 2025 11:13
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    Save RhetTbull/db70c113efd03029c6ff619f4699ce34 to your computer and use it in GitHub Desktop.
    Get the named timezone for a given location in python using native macOS CoreLocation APIs
    """Get named timezone for a location on macOS using CoreLocation
    To use this script, you need to have pyobjc-core and pyobjc-framework-CoreLocation installed:
    pip install pyobjc-core pyobjc-framework-CoreLocation
    This script uses CoreLocation to get the timezone for a given latitude and longitude
    as well as the timezone offset for a given date.
    It effectively does the same thing as python packages like [tzfpy](https://pypi.org/project/tzfpy/)
    or [timezonefinder](https://pypi.org/project/timezonefinder/) but uses macOS native APIs.
    """
    # /// script
    # dependencies = [
    # "pyobjc-core",
    # "pyobjc-framework-CoreLocation"
    # ]
    # ///
    importdatetime
    importobjc
    fromCoreLocationimportCLGeocoder,CLLocation
    fromFoundationimportNSDate,NSRunLoop,NSTimeZone
    WAIT_FOR_COMPLETION=0.01# wait time for async completion in seconds
    COMPLETION_TIMEOUT=5.0# timeout for async completion in seconds
    deftimezone_for_location(latitude:float,longitude:float)->NSTimeZone:
    withobjc.autorelease_pool():
    location=CLLocation.alloc().initWithLatitude_longitude_(latitude,longitude)
    geocoder=CLGeocoder.alloc().init()
    result= {"timezone":None,"error":None}
    completed=False
    defcompletion(placemarks,error):
    nonlocalcompleted
    iferror:
    result["error"]=error.localizedDescription()
    else:
    placemark=placemarks[0]ifplacemarkselseNone
    ifplacemarkandplacemark.timeZone():
    result["timezone"]=placemark.timeZone()
    else:
    result["error"]="Unable to determine timezone"
    completed=True
    geocoder.reverseGeocodeLocation_completionHandler_(location,completion)
    # reverseGeocodeLocation_completionHandler_ is async so run the event loop until completion
    # I usuall use threading.Event for this type of thing in pyobjc but the the thread blocked forever
    waiting=0
    whilenotcompleted:
    NSRunLoop.currentRunLoop().runMode_beforeDate_(
    "NSDefaultRunLoopMode",
    NSDate.dateWithTimeIntervalSinceNow_(WAIT_FOR_COMPLETION),
    )
    waiting+=WAIT_FOR_COMPLETION
    ifwaiting>=COMPLETION_TIMEOUT:
    raiseTimeoutError(
    f"Timeout waiting for completion of reverseGeocodeLocation_completionHandler_:{waiting} seconds"
    )
    ifresult["error"]:
    raiseException(f"Error:{result['error']}")
    returnresult["timezone"]
    if__name__=="__main__":
    importargparse
    importtime
    defparse_date(date_str):
    try:
    returndatetime.datetime.strptime(date_str,"%Y-%m-%d %H:%M:%S")
    exceptValueError:
    returndatetime.datetime.strptime(date_str,"%Y-%m-%d")
    parser=argparse.ArgumentParser(description="Get timezone for a location")
    parser.add_argument("latitude",type=float,help="Latitude of location")
    parser.add_argument("longitude",type=float,help="Longitude of location")
    parser.add_argument(
    "--date",
    type=lambdad:parse_date(d),
    default=datetime.datetime.now(),
    help="Date/time for timezone offset in format 'YYYY-MM-DD HH:MM:SS' or 'YYYY-MM-DD'",
    )
    args=parser.parse_args()
    try:
    start_t=time.time_ns()
    timezone=timezone_for_location(args.latitude,args.longitude)
    offset=timezone.secondsFromGMTForDate_(
    args.date
    )# takes an NSDate but pybojc will convert
    end_t=time.time_ns()
    print(
    f"Timezone:{timezone.name()}, offset:{offset}, took:{(end_t-start_t)/1e6:.2f} ms"
    )
    exceptExceptionase:
    print(f"Error:{e}")
    @RhetTbull
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    MIT License

    @RhetTbull
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    Run like this:

    uv run"https://gist.githubusercontent.com/RhetTbull/db70c113efd03029c6ff619f4699ce34/raw/06f34e6d64f054faa88c1caea4a4fa3968e14848/tzname.py" 34 -118

    Which ouputs:

    Timezone: America/Los_Angeles, offset: -28800, took: 317.20 ms

    Or

    uv run"https://gist.githubusercontent.com/RhetTbull/db70c113efd03029c6ff619f4699ce34/raw/06f34e6d64f054faa88c1caea4a4fa3968e14848/tzname.py" 34 -118 --date"2024-06-01"

    which outputs

    Timezone: America/Los_Angeles, offset: -25200, took: 264.47 ms

    @RhetTbull
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    Thanks to@simonw for the tip on including uvscript block.

    @oPromessa
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    oPromessa commentedJan 26, 2025•
    edited
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    Amazing. Offset accounts for DST based on sample date.

    Tries to extract DST status viatimezone.isDaylightSavingTime() but it comes as False in both cases. Sorry don't master Apple Foundation framework.

    $ python tzname.py 43 -9 --date"2024-06-01 10:00:00"Timezone: Europe/Madrid, offset: 7200, took: 254.66 ms$ python tzname.py  43 -9 --date"2024-01-01 10:00:00" Timezone: Europe/Madrid, offset: 3600, took: 304.73 ms

    Added:

    # Get DST informationis_dst=timezone.isDaylightSavingTimeForDate_(args.date)dst_offset=timezone.daylightSavingTimeOffsetForDate_(args.date)dst_timezone_name=timezone.abbreviationForDate_(args.date)print(f"Timezone:{timezone.name()}, offset:{offset}, "f"DST:{is_dst}, DST offset:{dst_offset}, "f"DST timezone name:{dst_timezone_name}, "f"took:{(end_t-start_t)/1e6:.2f} ms"        )

    @RhetTbull
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    RhetTbull commentedJan 27, 2025•
    edited
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    Weird.timezone.isDaylightSavingTimeForDate_(args.date) works correctly for me.

    ❯ python tz.py 34 -118 --date"2021-06-01"Timezone: America/Los_Angeles, offset: -25200, DST: True, took: 281.25 ms❯ python tz.py 34 -118 --date"2021-01-01"Timezone: America/Los_Angeles, offset: -28800, DST: False, took: 292.69 ms

    I added:

    is_dst=timezone.isDaylightSavingTimeForDate_(args.date)print(f"Timezone:{timezone.name()}, offset:{offset}, DST:{is_dst}, took:{(end_t-start_t)/1e6:.2f} ms"        )

    @agouliel
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    Very nice, thank you

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