I am trying to convert unix time on my local system to UTC time in unix format, but after converting it the final time is going off by +1 hour.
To do so, I wrote the following code.
from dateutil import tz
import time
from time
import mktime
now_time = time.time()
print('current local unix time', now_time)
print(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(now_time)))
to_zone = tz.tzutc()
from_zone = tz.tzlocal()
t = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(now_time))
utc = datetime.strptime(str(t), '%Y-%m-%d %H:%M:%S')
utc = utc.replace(tzinfo=from_zone)
central = utc.astimezone(to_zone)
print('Converted to UTC ',central)
unix_secs = mktime(central.timetuple())
print('Central unix time ',unix_secs)
print('central unix time to dattime ', time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(unix_secs)))
The output is as follows
current local unix time 1563985835.3707478
2019-07-24 12:30:35
Converted to UTC 2019-07-24 16:30:35+00:00
Central unix time 1564003835.0
central unix time to dattime 2019-07-24 17:30:35
can someone please tell me what am I doing wrong here and how can I fix this?
I guess you're incorrectly transform datetimes with TZ information when converting the timestamp to datetime instance using time.strftime and after that datetime.strptime or when using mktime.
Anyway, there is much easier way to achieve what you want:
from datetime import datetime, timezone
# Get current timestamp
now_timestamp = time.time()
>> 1563987839.054703
# Get datetime of that timestamp but already in UTC.
# This preserves TZ information and allows
# to correctly do transition to the timestamp again.
utc_time = datetime.utcfromtimestamp(now_timestamp)
>> datetime.datetime(2019, 7, 24, 17, 3, 59, 54703)
# Convert UTC datetime back to timestamp
utc_timestamp = utc_time.timestamp()
>> 1563977039.054703
# Verify that this timestamp is indeed UTC
# I am in UTC+3 timezone now
datetime.now()
>> datetime.datetime(2019, 7, 24, 20, 4, 10, 500229)
datetime.fromtimestamp(utc_timestamp)
>> datetime.datetime(2019, 7, 24, 17, 3, 59, 54703)