---
title: "1.31.1 — Month-boundary date helpers"
description: "Adds dates.get_start_of_month and dates.get_end_of_month for consumers that summarize or bill per calendar month. No behaviour changes."
date: "2026-09-29"
tags: ["release"]
canonical: "https://django-mojo.sitesmojo.com/changelog/1-31-1/"
---

Adds dates.get_start_of_month and dates.get_end_of_month for consumers that summarize or bill per calendar month. No behaviour changes.

### Added
- `mojo.helpers.dates.get_start_of_month(when=None)` — first instant of the calendar month containing `when`; defaults to now and returns a UTC-aware datetime.
- `mojo.helpers.dates.get_end_of_month(when=None)` — last instant of that month (`23:59:59.999999`), including the December rollover.