I am new Python. I am stuck at one point. I have variable that store time as string with specified timezone.
It is look like as given below
>>> print usertime 2017-08-18T08:00:00+04:30 >>> type(usertime) <type 'str'> So I just want to convert usertime time to utc time, The output should subtract 4 hours and 30 minutes from 2017-08-18T08:00:00. The output conversion will look like: 2017-08-18T03:30:00 as per utc format.
You want to convert the string to a datetime like object first. The problem with your string is that the timezone is in a format that datetime doesn't recognise.
You could use pandas Timestamp
import pandas as pd ts = pd.Timestamp(string).tz_convert("UTC") output = ts.strftime("%Y-%m-%dT%H:%M:%S") Alternatively, if you don't want to install/use Pandas, could convert the string format, and then use datetime.
import datetime import pytz import re # Remove the ':' from the timezone, if it's there. string = re.sub("\+(?P<hour>\d{2}):(?P<minute>\d{2})$", "+\g<hour>\g<minute>" , string) # Create the datetime object. dt = datetime.datetime.strptime(string, "%Y-%m-%dT%H:%M:%S%z") # Convert to UTC dt = dt.astimezone(pytz.UTC) output = dt.strftime("%Y-%m-%dT%H:%M:%S") If you're using python 2.7, and can't specify %z when calling strptime the standard workaround is to do this:
def parse(string): dt = datetime.strptime(string[0:19],'%Y-%m-%dT%H:%M:%S') if string[19] == "+": dt -= datetime.timedelta(hours=int(string[20:22]), minutes=int(string[22:])) elif t[19]=='-': dt += datetime.timedelta(hours=int(string[20:22]), minutes=int(string[22:])) return dt The advantage of the methods above, vs Stefano's answer, is that they will work with an arbitrary offset. Not just for four and half hours.
Python 2.7 dt = datetime.datetime.strptime(string, "%Y-%m-%dT%H:%M:%S%z") will throw a ValueError: 'z' is a bad directive in format '%Y-%m-%dT%H:%M:%S%z'You can install the package python-dateutil with pip and use "parser" to convert your string into datetime format (utc) and you can use timedelta to subtract the 4 hours and 30 minutes.
from datetime import datetime, timedelta from dateutil import parser usertime = "2017-08-18T08:00:00+04:30" date = parser.parse(usertime) date = date - timedelta(hours=4, minutes=30) print date 2017-08-18 03:30:00+04:30