import time

import datetime

def utc2local(utc):

# https://stackoverflow.com/a/19238551

epoch = time.mktime(utc.timetuple())

offset = datetime.datetime.fromtimestamp(epoch) - datetime.datetime.utcfromtimestamp(epoch)

return utc + offset

x1 = datetime.datetime.now()

str(x1)

x1 = datetime.datetime(2018, 12, 16, 12, 0)

x2 = datetime.datetime(2018, 12, 16, 12, 1)

x2.timestamp() - x1.timestamp()

datetime.datetime.fromtimestamp(0)

datetime.datetime.utcfromtimestamp(0)

# see: https://docs.python.org/3/library/datetime.html#strftime-and-strptime-behavior

x1 = datetime.datetime.strptime('2018-12-16 12:01:02', '%Y-%m-%d %H:%M:%S')

x1.strftime('%a, %b, %d %H:%M')

x1 = datetime.datetime(2018, 12, 16, 12, 0)

x1 + datetime.timedelta(hours=10)

x1 - datetime.timedelta(days=1)

x1 = datetime.datetime.fromtimestamp(0)

x2 = x1.replace(tzinfo=datetime.timezone(datetime.timedelta(hours=3)))

x1 = datetime.datetime.utcnow()

x2 = x1.replace(tzinfo=datetime.timezone.utc)

x3 = x2.astimezone(datetime.timezone(datetime.timedelta(hours=8)))

z0 = datetime.datetime.now()

z0.strftime('%Y%m%d-%H:%M:%S')