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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

v3.1.1 (2026-04-13)

Bug Fixes

  • Enable changelog updates for semantic release (cec6ada)

[3.1.0] - 2026-04-13

changed

  • Modernized packaging and developer workflow around pyproject.toml, uv, pytest, ruff, and mypy
  • Updated CI and release automation to use the new build and verification flow
  • Replaced the legacy single-file unittest suite with a pytest test layout while preserving the existing behavior coverage
  • Updated the Docker image to a current Python base image and removed the old requirements.txt and setup.py install path

compatibility

  • Support remains Python 3.10+
  • During the modernization pass, the floor was briefly evaluated at 3.11+, but it was set to 3.10+ instead because the library and tooling still work cleanly there and it keeps a broader install base without adding meaningful maintenance overhead
  • Previous published support before this change was Python 3.8+; this update intentionally drops 3.8 and 3.9 to align the project with a more current 2026 baseline while keeping 3.10 available
  • zoneinfo is now used in tests instead of pytz, but this does not require raising the runtime floor beyond Python 3.10

[3.0.3] - 2024-09-12

Please use 3.0.3 going forward! 3.0.2 has a breaking bug.

fixed

  • Fix: issue where version wasnt getting populated
  • Fix: move version out of VERSION.txt and into datemath/_version.py directly
  • Fix: typos in CHANGELOG. Thank you @s00hyun!

[3.0.2] - 2024-09-11

added

  • Feat: Complete typing with strict type-checking #43 Thank you @Avasam!
  • Feat: Added __version__ to verify the version of the module.
  • Feat: Added Dockerfile and relevant verify.py to help with local development and testing

chore

  • Chore: bumped modules in requirements.txt

fixed

  • Fix: removed legacy-tests.py since we no longer support python2.x
  • Fix: removed requirements-2.txt from manifest due to deprecation of python2 support
  • Fix: renamed requirements-3.txt to requirements.txt to support python3 going forward
    • also modifed to release.yaml and tests.yaml workflows to support this
  • Fix: long_description should now show up in pypi #33
  • Fix: move more pypi configurations to setup.cfg and out of setup.py

[3.0.1] - 2024-08-23

fixed

  • Fix: Race condition in timezone tests: #36
  • Fix: Updated arrow version: #32
  • Fix: mypy type hint checking in tests: #31
  • Fix: SyntaxWarning: invalid escape sequence in re.match(): #39
  • Fix: Licence Classifier: #34
  • Fix: Bump certifi to latest: #38

added

  • Feat: Typehint support: #31
  • Feat: Renamed CHANGELOG.md to keepachangelog.org format

todo

  • todo: Fix pypi: #33

deprecated

  • python 2.7 support. Python 3.8+ will only be supported going forward

[1.5.5] - 2021-04-26

fixed

  • fix: Issue #28
    • datemath() object now returns the expected datetime object instead of an Arrow object
    • added tests to catch invalid object types of helpers

[1.5.4] - 2021-04-20

Unused

  • skipped due to name conflict on pypi, all changes in this are from 1.5.3

[1.5.3] - 2021-04-16

fixed

  • FIX: Issue #25 - Fixed an issue where if you provided an invalid timestamp, i.e. datemath('2') you would not get an DateMathException back. Also bumped dependencies.

[1.5.2] - 2020-10-01

fixed

  • FIX: Issue #21 - Fixed an issue where if timezone offset was in a datetime string (ISO8601), the timezone of the returned datemath object would be UTC and not the timezone as specified in the datetime string.

[1.5.1] - 2020-03-25

fixed

  • FIX: Issue #15 - Fixed issue with parser finding invalid timeunits and throwing correct errors

added

  • Feat: Issue #16 - Added support for parser to accecpt a epoch/unix timestamp but throw an error on epoch milli's since arrow can't support that.

[1.5.0] - 2019-11-09

fixed

  • Issue #12 - missing VERSION.txt. Added MANIFEST.in for sdist build
  • PR #13 - Fix BaseException to Exception inheritence, thank you for your contribution @yury-primer!

[1.4.9] - 2019-10-26

** PLEASE DO NOT USE THIS VERSION, use 1.5.0+ instead. This may not compile on your system due to a missing VERSION.txt which was fixed in 1.5.0+ **

fixed

  • [FIX] Issue #9 && Issue #8 - Fixing deprecated arrow replace() function with shift().
  • [FIX] Arrow upgrade to 0.15.2 to fix the above mentioned issues
  • [FIX] Modifed tests.py to account for the timestamp change (tz is now +0000, instead of -0000)
  • [FIX] replaced ts = ts.replace(tzinfo=tz.gettz(timezone)) with ts = ts.replace(tzinfo=timezone) in datemath.helpers.parseTime() to fix Issue #7

added

  • [NEW] Breakout of python2 and python3 requirements
  • [NEW] Breakout of python2 and python3 specific CICD pipelines
  • [NEW] Derecated the following python version (although they may still work, they are no longer supported) - 2.4,2.6,3.4,3.5

[1.4.8] - 2019-10-25

** dont use this version **

  • skipped due to name conflict on pypi, all changes are in 1.4.9

[1.4.7] - 2017-11-10

fixed

  • [FIX] Fixed timezone for date strings: Issue #6

[1.4.5] - 2017-03-21

added

  • [NEW] Added roundDown functionality. Allows user to specify the default rounding for expressions such as /d.
  • example - assuming the time is currently 2016-01-01 12:00:00, we should get the following
>>> # now = 2016-01-01 14:00:00+00:00
>>> dm('now+/d', roundDown=False)
<Arrow [2016-01-01T23:59:00+00:00]>
>>> dm('now/d')
<Arrow [2016-01-01T00:00:00+00:00]>

[1.4.4] - 2016-12-28

fixed

  • [FIX] Fixed bug with expression logic and rounding: #2

[1.4.3] - 2016-03-31

added

[NEW] Floats are now supported for days, hours, and seconds units. Example now-2.5d, now-3.2h. Any other unit other than days, hours, or seconds that is a float will be converted to an int and floored due to the datetime() module not being able to handle them.