times = (message.text).replace(".20",".")
if times == time.strftime("%d.%m.%y"):
import datetime
base_datetime = datetime.datetime(2021, 4, 1, 10, 0, 0)
base_datetime_add_3_hour = base_datetime + datetime.timedelta(hours=3)
print(base_datetime)
print(base_datetime_add_3_hour)
# 2021-04-01 10:00:00
# 2021-04-01 13:00:00