input: Write a python function to convert the timestamp to a readable date format.
  assert getDateTime(1591123259) == "02-06-2020"
  assert getDateTime(1609459200) == "01-01-2021"
  assert getDateTime(1622505600) == "01-06-2021"
output: def getDateTime(timestamp):
      from datetime import datetime
      return datetime.utcfromtimestamp(timestamp).strftime('%d-%m-%Y')