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Better dates & times for Python

Project description

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Arrow is a Python library that offers a sensible, human-friendly approach to creating, manipulating, formatting and converting dates, times, and timestamps. It implements and updates the datetime type, plugging gaps in functionality, and provides an intelligent module API that supports many common creation scenarios. Simply put, it helps you work with dates and times with fewer imports and a lot less code.

Arrow is heavily inspired by moment.js and requests.


Python’s standard library and some other low-level modules have near-complete date, time and timezone functionality but don’t work very well from a usability perspective:

  • Too many modules: datetime, time, calendar, dateutil, pytz and more
  • Too many types: date, time, datetime, tzinfo, timedelta, relativedelta, etc.
  • Timezones and timestamp conversions are verbose and unpleasant
  • Timezone naivety is the norm
  • Gaps in functionality: ISO-8601 parsing, timespans, humanization


  • Fully implemented, drop-in replacement for datetime
  • Supports Python 2.7, 3.5, 3.6, 3.7 and 3.8
  • Timezone-aware & UTC by default
  • Provides super-simple creation options for many common input scenarios
  • Updated replace method with support for relative offsets, including weeks
  • Formats and parses strings automatically
  • Partial support for ISO-8601
  • Timezone conversion
  • Timestamp available as a property
  • Generates time spans, ranges, floors and ceilings in timeframes from year to microsecond
  • Humanizes and supports a growing list of contributed locales
  • Extensible for your own Arrow-derived types

Quick Start


To install Arrow, use pip or pipenv:

$ pip install -U arrow

Example Usage

>>> import arrow
>>> utc = arrow.utcnow()
>>> utc
<Arrow [2013-05-11T21:23:58.970460+00:00]>

>>> utc = utc.replace(hours=-1)
>>> utc
<Arrow [2013-05-11T20:23:58.970460+00:00]>

>>> local ='US/Pacific')
>>> local
<Arrow [2013-05-11T13:23:58.970460-07:00]>

>>> arrow.get('2013-05-11T21:23:58.970460+00:00')
<Arrow [2013-05-11T21:23:58.970460+00:00]>

>>> local.timestamp

>>> local.format()
'2013-05-11 13:23:58 -07:00'

>>> local.format('YYYY-MM-DD HH:mm:ss ZZ')
'2013-05-11 13:23:58 -07:00'

>>> local.humanize()
'an hour ago'

>>> local.humanize(locale='ko_kr')
'1시간 전'


For full documentation, please visit


Contributions are welcome for both code and localization. To get started, find an issue or feature to tackle on the issue tracker and then fork the repository on GitHub to begin making changes. If you would like to help with localization, please see for what locales are currently supported. If you are helping with code, make sure to add tests to ensure that a bug was fixed or the feature works as intended.

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