import datetime
import time

ltime=time.localtime(19532546)
timeY=time.strftime("%Y-%m-%d %H:%M:%S",ltime)
print(timeY) #2018-09-09

dateC=datetime.datetime(2018,09,30,10,10,10)
timestamp=time.mktime(dateC.timetuple())
print(timestamp) #789564121