Getting Time Zone from Lat Long Coordinates?

Question

I am trying to get the time zones for latitude and longitude coordinates but am having a few problems
The mistakes are probably very basic

I have a table in a database with around 600 rows. Each row contains a lat long coordinate for somewhere in the world
I want to feed these co-ordinates into a function and then retrieve the time zone. The aim being to convert events which have a local time stamp within each of these 600 places into UTC time

I found a blog post which uses a piece of code to derive timezones from geographical coordinates.

When I try to run the code, I get the error geonames is not defined. I have applied for an account with geonames.

I think I have just saved the function file in the wrong directory or something simple. Can anyone help

#-------------------------------------------------------------------------------
# Converts latitude longitude into a time zone
# REF: https://gist.github.com/pamelafox/2288222
# REF: http://blog.pamelafox.org/2012/04/converting-addresses-to-timezones-in.html
#-------------------------------------------------------------------------------

geonames_client = geonames.GeonamesClient('Username_alpha')
geonames_result = geonames_client.find_timezone({'lat': 48.871236, 'lng': 2.77928})
user.timezone = geonames_result['timezoneId']

Asked By: John Smith

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Source

Answer 1

This works as expected:

import geonames
geonames_client = geonames.GeonamesClient('demo')
geonames_result = geonames_client.find_timezone({'lat': 48.871236, 'lng': 2.77928})
print geonames_result['timezoneId']

Output:

'Europe/Paris'

Answered By: Manu

Answer 2

import requests
lat = 48.871236 ## your latitude
lon = 2.77928 ## your longitude

url = "http://api.geonames.org/timezoneJSON?formatted=true&lat={}&lng={}&username=demo".format(lat,lon)

r = requests.get(url) ## Make a request
return r.json()['timezoneId'] ## return the timezone

Answered By: Bilal

Answer 3

With tzwhere and pytz:

import datetime
import pytz
from tzwhere import tzwhere

tzwhere = tzwhere.tzwhere()
timezone_str = tzwhere.tzNameAt(37.3880961, -5.9823299) # Seville coordinates
timezone_str
#> Europe/Madrid

timezone = pytz.timezone(timezone_str)
dt = datetime.datetime.now()
timezone.utcoffset(dt)
#> datetime.timedelta(0, 7200)

Answered By: tuxayo

Answer 4

I was able to do a lookup suitable for my purposes using timezonefinder:

import datetime
import timezonefinder, pytz

tf = timezonefinder.TimezoneFinder()

# From the lat/long, get the tz-database-style time zone name (e.g. 'America/Vancouver') or None
timezone_str = tf.certain_timezone_at(lat=49.2827, lng=-123.1207)

if timezone_str is None:
    print("Could not determine the time zone")
else:
    # Display the current time in that time zone
    timezone = pytz.timezone(timezone_str)
    dt = datetime.datetime.utcnow()
    print("The time in %s is %s" % (timezone_str, dt + timezone.utcoffset(dt)))

There’s a discussion of the methods of timezonefinder and its limitations in the documentation linked from its pypi page.

timezonefinder and pytz can be found in the pip packages of the same name.

Answered By: rakslice

Getting Time Zone from Lat Long Coordinates?

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