old_contents: import datetime
  import time
  
  def datetime_to_sec_since_epoch(dt):
    '''Take a python datetime object and convert it to seconds since the unix epoch. Not timezone
       aware'''
    return time.mktime(dt.timetuple())
  
  def sec_since_epoch_to_datetime(sec_since_epoch):
    '''Take some number seconds since the epoch and convert them to a python datetime object. Not
       timezone aware'''
    return datetime.datetime.fromtimestamp(sec_since_epoch)
  
  def epoch_sec_to_minutes_since_epoch(sec_since_epoch):
    '''Return the number of minutes since the epoch (quite a large number)'''
    return (sec_since_epoch / 60) % 60
  
new_contents: import datetime
  import time
  
  def datetime_to_sec_since_epoch(dt):
    '''Take a python datetime object and convert it to seconds since the unix epoch. Not timezone
       aware'''
    return int(time.mktime(dt.timetuple()))
  
  def sec_since_epoch_to_datetime(sec_since_epoch):
    '''Take some number seconds since the epoch and convert them to a python datetime object. Not
       timezone aware'''
    return datetime.datetime.fromtimestamp(sec_since_epoch)
  
  def epoch_sec_to_minutes_since_epoch(sec_since_epoch):
    '''Return the number of minutes since the epoch (quite a large number)'''
    return (sec_since_epoch / 60)
  
subject: Make datetime_to_sec_since_epoch return an int and fix epoch_sec_to_minutes_since_epoch