1.31.1 — Month-boundary date helpers

2026-09-29

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.