Arrow: Better dates & times for Python

Release v1.3.0 (Installation) (Changelog)

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Arrow is a Python library that offers a sensible and 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 providing 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 named after the arrow of time and is heavily inspired by moment.js and requests.

Why use Arrow over built-in modules?

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

  • Support for Python 3.6+

  • Timezone-aware and UTC by default

  • Super-simple creation options for many common input scenarios

  • shift method with support for relative offsets, including weeks

  • Format and parse strings automatically

  • Wide support for the ISO 8601 standard

  • Timezone conversion

  • Support for dateutil, pytz, and ZoneInfo tzinfo objects

  • Generates time spans, ranges, floors and ceilings for time frames ranging from microsecond to year

  • Humanize dates and times with a growing list of contributed locales

  • Extensible for your own Arrow-derived types

  • Full support for PEP 484-style type hints

Quick Start


To install Arrow, use pip or pipenv:

$ pip install -U arrow

Example Usage

>>> import arrow
>>> arrow.get('2013-05-11T21:23:58.970460+07:00')
<Arrow [2013-05-11T21:23:58.970460+07:00]>

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

>>> utc = utc.shift(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]>

>>> 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')
'한시간 전'