Calculating the difference between two datetimes?-CodePudding

from datetime import datetime
import pytz

cur_time = datetime.now()
cur_time = pytz.utc.localize(cur_time)

rr_name = 'xx_20211005141746.txt'
rr_time =  re.search('_(.*).txt', rr_name).group(1)
rr_time =  datetime.strptime(rr_time, '%Y%m%d%H%M%S')

tzone = "Europe/London"
hb_time = pytz.utc.localize(rr_time).astimezone(pytz.timezone(tzone))
                    
diff = cur_time - hb_time

l_heared = round((diff.total_seconds() / 60), 2)

The difference between cur_time and rr_time is around 6 minutes, which is 360 seconds. How comes delta gives me back 77.65 seconds...

Please note cur_time and rr_name are native datetimes

CodePudding user response：

Use the total_seconds method:

print(f'{delta.total_seconds()} seconds')

output: 337.525332 seconds

CodePudding user response：

You'll have to set the correct time zone for date/time stored in the filename directly, don't set it to UTC first and then convert:

import re
from datetime import datetime
from zoneinfo import ZoneInfo # Python 3.9  ; there is backports.zoneinfo for older versions
# import pytz

now = datetime.now(ZoneInfo('UTC'))
# now = datetime.now(pytz.UTC)
print(now.astimezone(ZoneInfo('Europe/London')))
# 2021-10-05 14:58:43.957950 01:00

rr_name = 'xx_20211005141746.txt' # time zone Europe/London in filename ...
rr_time =  re.search('_(.*).txt', rr_name).group(1)
rr_time =  datetime.strptime(rr_time, '%Y%m%d%H%M%S').replace(tzinfo=ZoneInfo('Europe/London'))
# rr_time = pytz.timezone('Europe/London').localize(datetime.strptime(rr_time, '%Y%m%d%H%M%S'))
print(rr_time)
# 2021-10-05 14:17:46 01:00

l_heared = round(((now-rr_time).total_seconds() / 60), 2) 
print(l_heared, "minutes ago")
# 40.97 minutes ago