Demonstrate how to get UTC seconds for a local time in Python, in both the right and wrong way.

utc_the_right_way.py

from datetime import datetime
from pytz import timezone
 
dt = timezone("Asia/Shanghai").localize(datetime(1970, 1, 1, 8, 0, 0, 0))
UTC_EPOCH = datetime(1970, 1, 1, 0, 0, 0, 0, tzinfo=timezone("UTC"))
 
print int((dt - UTC_EPOCH).total_seconds())

utc_the_wrong_way.py

from datetime import datetime
from pytz import timezone
 
dt = datetime(1970, 1, 1, 8, 0, 0, 0, timezone("Asia/Shanghai"))
UTC_EPOCH = datetime(1970, 1, 1, 0, 0, 0, 0, timezone("UTC"))
 
print int((dt - UTC_EPOCH).total_seconds())