My objective is to take string(containg UTC date and time) as the input and convert it to local timezone based on Timezone difference. I have come up with the following code
Code
import time
print "Timezone Diff", time.timezone/3600
def convertTime(string):
print "Before Conversion"
print "year",string[0:4],"month",string[5:7],"day",string[8:10]
print "hour",string[11:13],"min",string[14:16]
print "After Conversion"
print "newhour",int(string[11:13])-(time.timezone/3600)
newhour = int(string[11:13])-(time.timezone/3600)
if newhour>=24:
print "year",string[0:4],"month",string[5:7],"newday",int(string[8:10])+1
print "hour",newhour-24,"min",string[14:16]
convertTime('2013:07:04:14:00')
Output:
Timezone Diff -10
Before Conversion
year 2013 month 07 day 04
hour 14 min 00
After Conversion
newhour 24
year 2013 month 07 newday 5
hour 0 min 00
This code is very basic , and clearly wouldn't work for month /year changes and not consider leap years. Can anyone suggest me a better approach to this issue.
Here's a solution with the datetime and pytz modules, using my timezone as an example:
import pytz
import datetime
s = '2013:07:04:14:00'
mydate = datetime.datetime.strptime(s, '%Y:%m:%d:%H:%M')
mydate = mydate.replace(tzinfo=timezone('Australia/Sydney'))
print mydate
Prints:
2013-07-04 14:00:00+10:00
You may have to "reshape" the code to work for your exact output, but I hope this helps in any way!
To convert UTC time to a local timezone using only stdlib, you could use an intermediate timestamp value:
from datetime import datetime
def convertTime(timestring):
utc_dt = datetime.strptime(timestring, '%Y:%m:%d:%H:%M')
timestamp = (utc_dt - datetime.utcfromtimestamp(0)).total_seconds()
return datetime.fromtimestamp(timestamp) # return datetime in local timezone
See How to convert a python utc datetime to a local datetime using only python standard library?.
To support past dates that have different utc offsets, you might need pytz, tzlocal libraries (stdlib-only solution works fine on Ubuntu; pytz-based solution should also enable Windows support):
from datetime import datetime
import pytz # $ pip install pytz
from tzlocal import get_localzone # $ pip install tzlocal
# get local timezone
local_tz = get_localzone()
def convertTime(timestring):
utc_dt = datetime.strptime(timestring, '%Y:%m:%d:%H:%M')
# return naive datetime object in local timezone
local_dt = utc_dt.replace(tzinfo=pytz.utc).astimezone(local_tz)
#NOTE: .normalize might be unnecessary
return local_tz.normalize(local_dt).replace(tzinfo=None)
The below piece of code sorted out the issue for me . Though pytz is probably the best approach to use. But in case you don't have pytz the below solution could be an alternative.
import datetime
def convertTime(timestring):
UTC_OFFSET_TIMEDELTA = datetime.datetime.utcnow() - datetime.datetime.now()
local_datetime = datetime.datetime.strptime(timestring, "%Y:%m:%d:%H:%M")
result_utc_datetime = local_datetime - UTC_OFFSET_TIMEDELTA
print result_utc_datetime.strftime("%Y-%m-%d %H:%M:%S"),
s = '2013:07:07:14:00'
convertTime(s)
Related
In Python, how do you find what UTC time offset the computer is set to?
time.timezone:
import time
print -time.timezone
It prints UTC offset in seconds (to take into account Daylight Saving Time (DST) see time.altzone:
is_dst = time.daylight and time.localtime().tm_isdst > 0
utc_offset = - (time.altzone if is_dst else time.timezone)
where utc offset is defined via: "To get local time, add utc offset to utc time."
In Python 3.3+ there is tm_gmtoff attribute if underlying C library supports it:
utc_offset = time.localtime().tm_gmtoff
Note: time.daylight may give a wrong result in some edge cases.
tm_gmtoff is used automatically by datetime if it is available on Python 3.3+:
from datetime import datetime, timedelta, timezone
d = datetime.now(timezone.utc).astimezone()
utc_offset = d.utcoffset() // timedelta(seconds=1)
To get the current UTC offset in a way that workarounds the time.daylight issue and that works even if tm_gmtoff is not available, #jts's suggestion to substruct the local and UTC time can be used:
import time
from datetime import datetime
ts = time.time()
utc_offset = (datetime.fromtimestamp(ts) -
datetime.utcfromtimestamp(ts)).total_seconds()
To get UTC offset for past/future dates, pytz timezones could be used:
from datetime import datetime
from tzlocal import get_localzone # $ pip install tzlocal
tz = get_localzone() # local timezone
d = datetime.now(tz) # or some other local date
utc_offset = d.utcoffset().total_seconds()
It works during DST transitions, it works for past/future dates even if the local timezone had different UTC offset at the time e.g., Europe/Moscow timezone in 2010-2015 period.
gmtime() will return the UTC time and localtime() will return the local time so subtracting the two should give you the utc offset.
From https://pubs.opengroup.org/onlinepubs/009695399/functions/gmtime.html
The gmtime() function shall convert the time in seconds since the Epoch pointed to by timer into a broken-down time, expressed as Coordinated Universal Time (UTC).
So, despite the name gmttime, the function returns UTC.
I like:
>>> strftime('%z')
'-0700'
I tried JTS' answer first, but it gave me the wrong result. I'm in -0700 now, but it was saying I was in -0800. But I had to do some conversion before I could get something I could subtract, so maybe the answer was more incomplete than incorrect.
the time module has a timezone offset, given as an integer in "seconds west of UTC"
import time
time.timezone
You can use the datetime and dateutil libraries to get the offset as a timedelta object:
>>> from datetime import datetime
>>> from dateutil.tz import tzlocal
>>>
>>> # From a datetime object
>>> current_time = datetime.now(tzlocal())
>>> current_time.utcoffset()
datetime.timedelta(seconds=7200)
>>> current_time.dst()
datetime.timedelta(seconds=3600)
>>>
>>> # From a tzlocal object
>>> time_zone = tzlocal()
>>> time_zone.utcoffset(datetime.now())
datetime.timedelta(seconds=7200)
>>> time_zone.dst(datetime.now())
datetime.timedelta(seconds=3600)
>>>
>>> print('Your UTC offset is {:+g}'.format(current_time.utcoffset().total_seconds()/3600))
Your UTC offset is +2
hours_delta = (time.mktime(time.localtime()) - time.mktime(time.gmtime())) / 60 / 60
Create a Unix Timestamp with UTC Corrected Timezone
This simple function will make it easy for you to get the current time from a MySQL/PostgreSQL database date object.
def timestamp(date='2018-05-01'):
return int(time.mktime(
datetime.datetime.strptime( date, "%Y-%m-%d" ).timetuple()
)) + int(time.strftime('%z')) * 6 * 6
Example Output
>>> timestamp('2018-05-01')
1525132800
>>> timestamp('2018-06-01')
1527811200
Here is some python3 code with just datetime and time as imports. HTH
>>> from datetime import datetime
>>> import time
>>> def date2iso(thedate):
... strdate = thedate.strftime("%Y-%m-%dT%H:%M:%S")
... minute = (time.localtime().tm_gmtoff / 60) % 60
... hour = ((time.localtime().tm_gmtoff / 60) - minute) / 60
... utcoffset = "%.2d%.2d" %(hour, minute)
... if utcoffset[0] != '-':
... utcoffset = '+' + utcoffset
... return strdate + utcoffset
...
>>> date2iso(datetime.fromtimestamp(time.time()))
'2015-04-06T23:56:30-0400'
This works for me:
if time.daylight > 0:
return time.altzone
else:
return time.timezone
import requests
import bs4
root_url = 'url here'
response = requests.get(root_url)
soup = bs4.BeautifulSoup(response.content)
hora = soup.select('span.match-time')[0].get_text()
return - 20:45
I need to convert the string variable "hora" to datetime zone UTC
Update:
from_zone = tz.gettz('UTC')
to_zone = tz.gettz('America/Montevideo')
utc = dt_obj.replace(tzinfo=from_zone)
central = utc.astimezone(to_zone)
print(central)
return 1900-01-01 15:45:00-03:45
time difference is 3 hours not 3:45.
What is the matter?
Thankyou
See Python'sdatetime library (datetime)
You're going to particularly need to use datetime.strptime to parse 20:45. You'll also need pytz (pip install pytz) to get UTC timezone.
import pytz
import datetime
udt = datetime.datetime.strptime(hora, '%H:%M').time().replace(tzinfo=pytz.UTC)
This is assuming the time you're reading is already in UTC.
datetime.time(*map(int,hora_string.split(":")))
but you would need to know the timezone it is in in order to change it ...
you could also use the dateutil library
import dateutil.parser as p
print p.parse("16:45")
but this will attach todays date to the time , which may not be desireable
from datetime import datetime as dt
hora = "20:45"
the_time = dt.strptime(hora, "%H:%M").time()
This will return a datetime.time() object.
To convert UTC time to a given timezone, you need to know both date and time (utc offset may be different at a different date/time):
>>> from datetime import datetime
>>> import pytz
>>> input_time = datetime.strptime('20:45', '%H:%M').time()
>>> utc_dt = datetime.combine(datetime.utcnow(), input_time)
>>> tz = pytz.timezone('America/Montevideo')
>>> str(utc_dt.replace(tzinfo=pytz.utc).astimezone(tz))
'2015-01-24 18:45:00-02:00'
Note: the current offset is 2 hours, not 3. Uruguay observes DST from October till March.
I have a datetime that i get from a database, this datetime is a UTC datetime. But when i pull it from the DB, it is unaware of the timezone. What i need to do, is convert this datetime to a "seconds from epoch" time for another function. The problem with this, is that the system's time is in PST and i am not able to change it for specific reasons.
So, what i want to do is, take this datetime that i get from the database, and tell python that this datetime is a UTC datetime. Every way that i have done that, results in it losing time or gaining time due to timezone conversions. Again, not trying to convert the time, just trying to specify that it is UTC.
If anyone can help with this that would be great.
Thanks!
Example
Assume database_function() returns a datetime data type that is '2013-06-01 01:06:18'
datetime = database_function()
epoch = datetime.strftime('%s')
pytz.utc.localize(database_function()).datetime.strftime('%s')
datetime.replace(tzinfo=pytz.utc).datetime.strftime('%s')
Both of these return a epoch timestamp of 1370077578
But, it SHOULD return a timestamp of 1370048778 per http://www.epochconverter.com/
Remember, this timestamp is a utc timestamp
Using the fabolous pytz:
import datetime, pytz
dt = datetime.datetime(...)
utc_dt = pytz.utc.localize(dt)
This creates a tz-aware datetime object, in UTC.
How about Setting timezone in Python This appears to reset the timezone within your python script. You are changing the time zone that your system sees given the specified time, not changing the specified time into the specified time zone. You probably want to set it to 'UTC'
time.tzset()
Resets the time conversion rules used by the library routines.
The environment variable TZ specifies how this is done.
New in version 2.3.
Availability: Unix.
I do not have this available on my home platform so I could not test it. I had to get this from the previous answer.
The answer marked best on the question is:
>>> import os, time
>>> time.strftime('%X %x %Z')
'12:45:20 08/19/09 CDT'
>>> os.environ['TZ'] = 'Europe/London'
>>> time.tzset()
>>> time.strftime('%X %x %Z')
'18:45:39 08/19/09 BST'
To get the specific values you've listed:
>>> year = time.strftime('%Y')
>>> month = time.strftime('%m')
>>> day = time.strftime('%d')
>>> hour = time.strftime('%H')
>>> minute = time.strftime('%M')
See here for a complete list of directives. Keep in mind that the strftime() function will always return a string, not an integer or other type.
You can Use pytz, which is a time zone definitions package.
from datetime import datetime
from pytz import timezone
fmt = "%Y-%m-%d %H:%M:%S %Z%z"
# Current time in UTC
now_utc = datetime.now(timezone('UTC'))
print now_utc.strftime(fmt)
# Convert to US/Pacific time zone
now_pacific = now_utc.astimezone(timezone('US/Pacific'))
print now_pacific.strftime(fmt)
# Convert to Europe/Berlin time zone
now_berlin = now_pacific.astimezone(timezone('Europe/Berlin'))
print now_berlin.strftime(fmt)
output:
2014-04-04 21:50:55 UTC+0000
2014-04-04 14:50:55 PDT-0700
2014-04-04 23:50:55 CEST+0200
or may be it helps
>> import pytz
>>> import datetime
>>>
>>> now_utc = datetime.datetime.utcnow() #Our UTC naive time from DB,
for the time being here I'm taking it as current system UTC time..
>>> now_utc
datetime.datetime(2011, 5, 9, 6, 36, 39, 883479) # UTC time in Naive
form.
>>>
>>> local_tz = pytz.timezone('Europe/Paris') #Our Local timezone, to
which we want to convert the UTC time.
>>>
>>> now_utc = pytz.utc.localize(now_utc) #Add Timezone information to
UTC time.
>>>
>>> now_utc
datetime.datetime(2011, 5, 9, 6, 36, 39, 883479, tzinfo=<UTC>) # The
full datetime tuple
>>>
>>> local_time = now_utc.astimezone(local\_tz) # Convert to local
time.
>>>
>>> local_time #Current local time in Paris
datetime.datetime(2011, 5, 9, 8, 36, 39, 883479, tzinfo=<DstTzInfo
'Europe/Paris' CEST+2:00:00 DST>)
Here is one way, using the pytz module:
import pytz
utc_datetime = (datetime.datetime(1970, 1, 1, tzinfo=pytz.utc)
+ datetime.timedelta(seconds=seconds_since_epoch)
If you don't want to install the pytz module, you can copy the example UTC class from the datetime documentation (search for "class UTC"):
https://docs.python.org/2/library/datetime.html#tzinfo-objects
Here's stdlib only solution without 3-party modules.
.., this datetime is a UTC datetime. But when i pull it from the DB, it is unaware of the timezone. What i need to do, is convert this datetime to a "seconds from epoch" time for another function.emphasize is mine
To convert an unaware (naive) datetime object that represents time in UTC to POSIX timestamp:
from datetime import datetime
timestamp = (dt_from_db - datetime(1970, 1, 1)).total_seconds()
Example:
>>> from datetime import datetime
>>> dt = datetime.strptime('2013-06-01 01:06:18', '%Y-%m-%d %H:%M:%S')
>>> (dt - datetime(1970, 1, 1)).total_seconds()
1370048778.0
See Converting datetime.date to UTC timestamp in Python that provides solutions for various Python versions.
To answer the question from the title: In general you need pytz library to handle timezones in Python. In particular, you should use .localize method to convert an unaware datetime object into timezone-aware one.
import pytz # $ pip install pytz
from tzlocal import get_localzone # $ pip install tzlocal
tz = get_localzone() # local timezone whatever it is (just an example)
aware_dt = tz.localize(naive_dt_in_local_timezone, is_dst=None)
is_dst=None asserts that naive_dt_in_local_timezone exists and unambiguous.
Though you don't need it for UTC timezone because it always has the same UTC offset (zero) around the year and in all past years:
import pytz
aware_dt = utc_dt.replace(tzinfo=pytz.utc)
See Python - simplest and most coherent way to get timezone-aware current time in UTC? (it provides a stdlib-only solution):
aware_dt = utc_dt.replace(tzinfo=timezone.utc)
I've never had to convert time to and from UTC. Recently had a request to have my app be timezone aware, and I've been running myself in circles. Lots of information on converting local time to UTC, which I found fairly elementary (maybe I'm doing that wrong as well), but I can not find any information on easily converting the UTC time to the end-users timezone.
In a nutshell, and android app sends me (appengine app) data and within that data is a timestamp. To store that timestamp to utc time I am using:
datetime.utcfromtimestamp(timestamp)
That seems to be working. When my app stores the data, it is being store as 5 hours ahead (I am EST -5)
The data is being stored on appengine's BigTable, and when retrieved it comes out as a string like so:
"2011-01-21 02:37:21"
How do I convert this string to a DateTime in the users correct time zone?
Also, what is the recommended storage for a users timezone information? (How do you typically store tz info ie: "-5:00" or "EST" etc etc ?) I'm sure the answer to my first question might contain a parameter the answers the second.
If you don't want to provide your own tzinfo objects, check out the python-dateutil library. It provides tzinfo implementations on top of a zoneinfo (Olson) database such that you can refer to time zone rules by a somewhat canonical name.
from datetime import datetime
from dateutil import tz
# METHOD 1: Hardcode zones:
from_zone = tz.gettz('UTC')
to_zone = tz.gettz('America/New_York')
# METHOD 2: Auto-detect zones:
from_zone = tz.tzutc()
to_zone = tz.tzlocal()
# utc = datetime.utcnow()
utc = datetime.strptime('2011-01-21 02:37:21', '%Y-%m-%d %H:%M:%S')
# Tell the datetime object that it's in UTC time zone since
# datetime objects are 'naive' by default
utc = utc.replace(tzinfo=from_zone)
# Convert time zone
central = utc.astimezone(to_zone)
Edit Expanded example to show strptime usage
Edit 2 Fixed API usage to show better entry point method
Edit 3 Included auto-detect methods for timezones (Yarin)
Here's a resilient method that doesn't depend on any external libraries:
from datetime import datetime
import time
def datetime_from_utc_to_local(utc_datetime):
now_timestamp = time.time()
offset = datetime.fromtimestamp(now_timestamp) - datetime.utcfromtimestamp(now_timestamp)
return utc_datetime + offset
This avoids the timing issues in DelboyJay's example. And the lesser timing issues in Erik van Oosten's amendment.
As an interesting footnote, the timezone offset computed above can differ from the following seemingly equivalent expression, probably due to daylight savings rule changes:
offset = datetime.fromtimestamp(0) - datetime.utcfromtimestamp(0) # NO!
Update: This snippet has the weakness of using the UTC offset of the present time, which may differ from the UTC offset of the input datetime. See comments on this answer for another solution.
To get around the different times, grab the epoch time from the time passed in. Here's what I do:
def utc2local(utc):
epoch = time.mktime(utc.timetuple())
offset = datetime.fromtimestamp(epoch) - datetime.utcfromtimestamp(epoch)
return utc + offset
See the datetime documentation on tzinfo objects. You have to implement the timezones you want to support yourself. The are examples at the bottom of the documentation.
Here's a simple example:
from datetime import datetime,tzinfo,timedelta
class Zone(tzinfo):
def __init__(self,offset,isdst,name):
self.offset = offset
self.isdst = isdst
self.name = name
def utcoffset(self, dt):
return timedelta(hours=self.offset) + self.dst(dt)
def dst(self, dt):
return timedelta(hours=1) if self.isdst else timedelta(0)
def tzname(self,dt):
return self.name
GMT = Zone(0,False,'GMT')
EST = Zone(-5,False,'EST')
print datetime.utcnow().strftime('%m/%d/%Y %H:%M:%S %Z')
print datetime.now(GMT).strftime('%m/%d/%Y %H:%M:%S %Z')
print datetime.now(EST).strftime('%m/%d/%Y %H:%M:%S %Z')
t = datetime.strptime('2011-01-21 02:37:21','%Y-%m-%d %H:%M:%S')
t = t.replace(tzinfo=GMT)
print t
print t.astimezone(EST)
Output
01/22/2011 21:52:09
01/22/2011 21:52:09 GMT
01/22/2011 16:52:09 EST
2011-01-21 02:37:21+00:00
2011-01-20 21:37:21-05:00a
If you want to get the correct result even for the time that corresponds to an ambiguous local time (e.g., during a DST transition) and/or the local utc offset is different at different times in your local time zone then use pytz timezones:
#!/usr/bin/env python
from datetime import datetime
import pytz # $ pip install pytz
import tzlocal # $ pip install tzlocal
local_timezone = tzlocal.get_localzone() # get pytz tzinfo
utc_time = datetime.strptime("2011-01-21 02:37:21", "%Y-%m-%d %H:%M:%S")
local_time = utc_time.replace(tzinfo=pytz.utc).astimezone(local_timezone)
This answer should be helpful if you don't want to use any other modules besides datetime.
datetime.utcfromtimestamp(timestamp) returns a naive datetime object (not an aware one). Aware ones are timezone aware, and naive are not. You want an aware one if you want to convert between timezones (e.g. between UTC and local time).
If you aren't the one instantiating the date to start with, but you can still create a naive datetime object in UTC time, you might want to try this Python 3.x code to convert it:
import datetime
d=datetime.datetime.strptime("2011-01-21 02:37:21", "%Y-%m-%d %H:%M:%S") #Get your naive datetime object
d=d.replace(tzinfo=datetime.timezone.utc) #Convert it to an aware datetime object in UTC time.
d=d.astimezone() #Convert it to your local timezone (still aware)
print(d.strftime("%d %b %Y (%I:%M:%S:%f %p) %Z")) #Print it with a directive of choice
Be careful not to mistakenly assume that if your timezone is currently MDT that daylight savings doesn't work with the above code since it prints MST. You'll note that if you change the month to August, it'll print MDT.
Another easy way to get an aware datetime object (also in Python 3.x) is to create it with a timezone specified to start with. Here's an example, using UTC:
import datetime, sys
aware_utc_dt_obj=datetime.datetime.now(datetime.timezone.utc) #create an aware datetime object
dt_obj_local=aware_utc_dt_obj.astimezone() #convert it to local time
#The following section is just code for a directive I made that I liked.
if sys.platform=="win32":
directive="%#d %b %Y (%#I:%M:%S:%f %p) %Z"
else:
directive="%-d %b %Y (%-I:%M:%S:%f %p) %Z"
print(dt_obj_local.strftime(directive))
If you use Python 2.x, you'll probably have to subclass datetime.tzinfo and use that to help you create an aware datetime object, since datetime.timezone doesn't exist in Python 2.x.
If using Django, you can use the timezone.localtime method:
from django.utils import timezone
date
# datetime.datetime(2014, 8, 1, 20, 15, 0, 513000, tzinfo=<UTC>)
timezone.localtime(date)
# datetime.datetime(2014, 8, 1, 16, 15, 0, 513000, tzinfo=<DstTzInfo 'America/New_York' EDT-1 day, 20:00:00 DST>)
The following worked for me in a Cloud environment for US west:
import datetime
import pytz
#set the timezone
tzInfo = pytz.timezone('America/Los_Angeles')
dt = datetime.datetime.now(tz=tzInfo)
print(dt)
Consolidating the answer from franksands into a convenient method.
import calendar
import datetime
def to_local_datetime(utc_dt):
"""
convert from utc datetime to a locally aware datetime according to the host timezone
:param utc_dt: utc datetime
:return: local timezone datetime
"""
return datetime.datetime.fromtimestamp(calendar.timegm(utc_dt.timetuple()))
You can use arrow
from datetime import datetime
import arrow
now = datetime.utcnow()
print(arrow.get(now).to('local').format())
# '2018-04-04 15:59:24+02:00'
you can feed arrow.get() with anything. timestamp, iso string etc
You can use calendar.timegm to convert your time to seconds since Unix epoch and time.localtime to convert back:
import calendar
import time
time_tuple = time.strptime("2011-01-21 02:37:21", "%Y-%m-%d %H:%M:%S")
t = calendar.timegm(time_tuple)
print time.ctime(t)
Gives Fri Jan 21 05:37:21 2011 (because I'm in UTC+03:00 timezone).
import datetime
def utc_str_to_local_str(utc_str: str, utc_format: str, local_format: str):
"""
:param utc_str: UTC time string
:param utc_format: format of UTC time string
:param local_format: format of local time string
:return: local time string
"""
temp1 = datetime.datetime.strptime(utc_str, utc_format)
temp2 = temp1.replace(tzinfo=datetime.timezone.utc)
local_time = temp2.astimezone()
return local_time.strftime(local_format)
utc_tz_example_str = '2018-10-17T00:00:00.111Z'
utc_fmt = '%Y-%m-%dT%H:%M:%S.%fZ'
local_fmt = '%Y-%m-%dT%H:%M:%S+08:00'
# call my function here
local_tz_str = utc_str_to_local_str(utc_tz_example_str, utc_fmt, local_fmt)
print(local_tz_str) # 2018-10-17T08:00:00+08:00
When I input utc_tz_example_str = 2018-10-17T00:00:00.111Z, （UTC +00:00）
then I will get local_tz_str = 2018-10-17T08:00:00+08:00 （My target timezone +08:00）
parameter utc_format is a format determined by your specific utc_tz_example_str.
parameter local_fmt is the final desired format.
In my case, my desired format is %Y-%m-%dT%H:%M:%S+08:00 ( +08:00 timezone). You should construct the format you want.
This worked for me:
from django.utils import timezone
from datetime import timedelta,datetime
ist_time = timezone.now() + timedelta(hours=5,minutes=30)
#second method
ist_time = datetime.now() + timedelta(hours=5,minutes=30)
I traditionally defer this to the frontend -- send times from the backend as timestamps or some other datetime format in UTC, then let the client figure out the timezone offset and render this data in the proper timezone.
For a webapp, this is pretty easy to do in javascript -- you can figure out the browser's timezone offset pretty easily using builtin methods and then render the data from the backend properly.
From the answer here, you can use the time module to convert from utc to the local time set in your computer:
utc_time = time.strptime("2018-12-13T10:32:00.000", "%Y-%m-%dT%H:%M:%S.%f")
utc_seconds = calendar.timegm(utc_time)
local_time = time.localtime(utc_seconds)
Here is a quick and dirty version that uses the local systems settings to work out the time difference. NOTE: This will not work if you need to convert to a timezone that your current system is not running in. I have tested this with UK settings under BST timezone
from datetime import datetime
def ConvertP4DateTimeToLocal(timestampValue):
assert isinstance(timestampValue, int)
# get the UTC time from the timestamp integer value.
d = datetime.utcfromtimestamp( timestampValue )
# calculate time difference from utcnow and the local system time reported by OS
offset = datetime.now() - datetime.utcnow()
# Add offset to UTC time and return it
return d + offset
Short and simple:
from datetime import datetime
t = "2011-01-21 02:37:21"
datetime.fromisoformat(t) + (datetime.now() - datetime.utcnow())
In Python, how do you find what UTC time offset the computer is set to?
time.timezone:
import time
print -time.timezone
It prints UTC offset in seconds (to take into account Daylight Saving Time (DST) see time.altzone:
is_dst = time.daylight and time.localtime().tm_isdst > 0
utc_offset = - (time.altzone if is_dst else time.timezone)
where utc offset is defined via: "To get local time, add utc offset to utc time."
In Python 3.3+ there is tm_gmtoff attribute if underlying C library supports it:
utc_offset = time.localtime().tm_gmtoff
Note: time.daylight may give a wrong result in some edge cases.
tm_gmtoff is used automatically by datetime if it is available on Python 3.3+:
from datetime import datetime, timedelta, timezone
d = datetime.now(timezone.utc).astimezone()
utc_offset = d.utcoffset() // timedelta(seconds=1)
To get the current UTC offset in a way that workarounds the time.daylight issue and that works even if tm_gmtoff is not available, #jts's suggestion to substruct the local and UTC time can be used:
import time
from datetime import datetime
ts = time.time()
utc_offset = (datetime.fromtimestamp(ts) -
datetime.utcfromtimestamp(ts)).total_seconds()
To get UTC offset for past/future dates, pytz timezones could be used:
from datetime import datetime
from tzlocal import get_localzone # $ pip install tzlocal
tz = get_localzone() # local timezone
d = datetime.now(tz) # or some other local date
utc_offset = d.utcoffset().total_seconds()
It works during DST transitions, it works for past/future dates even if the local timezone had different UTC offset at the time e.g., Europe/Moscow timezone in 2010-2015 period.
gmtime() will return the UTC time and localtime() will return the local time so subtracting the two should give you the utc offset.
From https://pubs.opengroup.org/onlinepubs/009695399/functions/gmtime.html
The gmtime() function shall convert the time in seconds since the Epoch pointed to by timer into a broken-down time, expressed as Coordinated Universal Time (UTC).
So, despite the name gmttime, the function returns UTC.
I like:
>>> strftime('%z')
'-0700'
I tried JTS' answer first, but it gave me the wrong result. I'm in -0700 now, but it was saying I was in -0800. But I had to do some conversion before I could get something I could subtract, so maybe the answer was more incomplete than incorrect.
the time module has a timezone offset, given as an integer in "seconds west of UTC"
import time
time.timezone
You can use the datetime and dateutil libraries to get the offset as a timedelta object:
>>> from datetime import datetime
>>> from dateutil.tz import tzlocal
>>>
>>> # From a datetime object
>>> current_time = datetime.now(tzlocal())
>>> current_time.utcoffset()
datetime.timedelta(seconds=7200)
>>> current_time.dst()
datetime.timedelta(seconds=3600)
>>>
>>> # From a tzlocal object
>>> time_zone = tzlocal()
>>> time_zone.utcoffset(datetime.now())
datetime.timedelta(seconds=7200)
>>> time_zone.dst(datetime.now())
datetime.timedelta(seconds=3600)
>>>
>>> print('Your UTC offset is {:+g}'.format(current_time.utcoffset().total_seconds()/3600))
Your UTC offset is +2
hours_delta = (time.mktime(time.localtime()) - time.mktime(time.gmtime())) / 60 / 60
Create a Unix Timestamp with UTC Corrected Timezone
This simple function will make it easy for you to get the current time from a MySQL/PostgreSQL database date object.
def timestamp(date='2018-05-01'):
return int(time.mktime(
datetime.datetime.strptime( date, "%Y-%m-%d" ).timetuple()
)) + int(time.strftime('%z')) * 6 * 6
Example Output
>>> timestamp('2018-05-01')
1525132800
>>> timestamp('2018-06-01')
1527811200
Here is some python3 code with just datetime and time as imports. HTH
>>> from datetime import datetime
>>> import time
>>> def date2iso(thedate):
... strdate = thedate.strftime("%Y-%m-%dT%H:%M:%S")
... minute = (time.localtime().tm_gmtoff / 60) % 60
... hour = ((time.localtime().tm_gmtoff / 60) - minute) / 60
... utcoffset = "%.2d%.2d" %(hour, minute)
... if utcoffset[0] != '-':
... utcoffset = '+' + utcoffset
... return strdate + utcoffset
...
>>> date2iso(datetime.fromtimestamp(time.time()))
'2015-04-06T23:56:30-0400'
This works for me:
if time.daylight > 0:
return time.altzone
else:
return time.timezone