This document describes Celery 2.4. For development docs, go here.



This module contains various utilities relating to dates and times.

  1. 2009 - 2011 by Ask Solem.

BSD, see LICENSE for more details.

celery.utils.timeutils.delta_resolution(dt, delta)

Round a datetime to the resolution of a timedelta.

If the timedelta is in days, the datetime will be rounded to the nearest days, if the timedelta is in hours the datetime will be rounded to the nearest hour, and so on until seconds which will just return the original datetime.

celery.utils.timeutils.humanize_seconds(secs, prefix='')

Show seconds in human form, e.g. 60 is “1 minute”, 7200 is “2 hours”.


Either datetime | str -> datetime or None -> None


Coerces integer to timedelta if delta is an integer.


Parses rate strings, such as “100/m” or “2/h” and converts them to seconds.

celery.utils.timeutils.remaining(start, ends_in, now=None, relative=False)

Calculate the remaining time for a start date and a timedelta.

e.g. “how many seconds left for 30 seconds after start?”

  • start – Start datetime.
  • ends_in – The end delta as a timedelta.
  • relative – If enabled the end time will be calculated using delta_resolution() (i.e. rounded to the resolution of ends_in).
  • now – Function returning the current time and date, defaults to

Convert datetime.timedelta to seconds.

Doesn’t account for negative values.


Return the position of a weekday (0 - 7, where 0 is Sunday).


>>> weekday("sunday"), weekday("sun"), weekday("mon")
(0, 0, 1)