old_contents: import time
  import datetime
  
  
  def get_current_utc(time_format="%Y-%m-%d %H:%M:%S"):
      """
      @return a string representation of the current time in UTC.
      """
      return time.strftime(time_format, time.gmtime())
  
  
  def today_strf():
      t = datetime.date.today()
      return t.strftime("%d/%m/%Y")
  
  
  def tomorrow_strf():
      t = datetime.date.today() + datetime.timedelta(days=1)
      return t.strftime("%d/%m/%Y")
  
  
  def yesterday_strf():
      t = datetime.date.today() - datetime.timedelta(days=1)
      return t.strftime("%d/%m/%Y")
  
  
  def seconds_to_milliseconds_timestamp(seconds_timestamp):
      return int(round(seconds_timestamp * 1000))
  
  
  def current_milliseconds_timestamp():
      return seconds_to_milliseconds_timestamp(time.time())
  
  
  def datetime_to_milliseconds_timestamp(datetime_obj):
      seconds_timestamp = time.mktime(datetime_obj.timetuple())
      return seconds_to_milliseconds_timestamp(seconds_timestamp)
  
new_contents: import time
  import datetime
  
  
  def get_current_utc(time_format="%Y-%m-%d %H:%M:%S"):
      """
      @return a string representation of the current time in UTC.
      """
      return time.strftime(time_format, time.gmtime())
  
  
  def today_strf(format="%d/%m/%Y"):
      t = datetime.date.today()
      return t.strftime(format)
  
  
  def tomorrow_strf(format="%d/%m/%Y"):
      t = datetime.date.today() + datetime.timedelta(days=1)
      return t.strftime(format)
  
  
  def yesterday_strf(format="%d/%m/%Y"):
      t = datetime.date.today() - datetime.timedelta(days=1)
      return t.strftime(format)
  
  
  def seconds_to_milliseconds_timestamp(seconds_timestamp):
      return int(round(seconds_timestamp * 1000))
  
  
  def current_milliseconds_timestamp():
      return seconds_to_milliseconds_timestamp(time.time())
  
  
  def datetime_to_milliseconds_timestamp(datetime_obj):
      seconds_timestamp = time.mktime(datetime_obj.timetuple())
      return seconds_to_milliseconds_timestamp(seconds_timestamp)
  
subject: Add format parameter to strf functions