Date & Time Packages
Date, time, and timezone parsing, formatting, and manipulation libraries for reliable scheduling and display logic (date-fns, Day.js, Chrono).
Packages in Date & Time
Kind
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date-fns
Modern JavaScript date utility library with 200+ pure, immutable functions
python-dateutil
Powerful extensions to Python's datetime module for parsing, deltas, recurrence, and timezones.
cron-parser
Parse, validate, and iterate cron expressions in Node.js with full timezone and DST support.
date-fns-tz
IANA time zone support for date-fns, powered by the native Intl API with zero bundled time zone data.
croniter
Parses cron schedule strings and iterates the matching datetime values, with DST, second/year fields, and last-weekday support.
react-datepicker
A fully customizable, accessible date and time picker component for React apps.
rrule
A JavaScript/TypeScript library for computing iCalendar (RFC 5545) recurrence rules for calendar dates.
pendulum
A drop-in replacement for Python's datetime with timezone-aware objects by default and a friendlier API.
types-pytz
PEP 561 type stubs that add static typing to the Python pytz timezone library
cron-descriptor
A Python library that converts cron expressions into plain-English, localized descriptions.
monotonic
Backport of time.monotonic() providing a clock that never goes backwards for Python 2 and pre-3.3 Python 3
bootstrap-datepicker
A jQuery datepicker widget styled for Bootstrap, with date-range picking, typed-input parsing, and 80+ locales.
Arrow
Better, human-friendly dates and times for Python
fecha
A lightweight, dependency-free JavaScript library for formatting and parsing dates.
moment-range
Fancy date ranges for Moment.js — create, query, compare, and iterate over time intervals.
@sinonjs/fake-timers
Deterministic fake implementations of setTimeout, setInterval, Date, and other timer APIs for fast, reliable JavaScript tests.
humanize
Converts numbers, dates, times, and file sizes into human-readable text for Python apps.
django-timezone-field
Django model, form, and REST framework fields for zoneinfo and pytz timezone objects
holidays
A fast, efficient Python library for generating country- and subdivision-specific public holidays on the fly.
time-machine
Travel through time in your Python tests by mocking datetime and time at the C level.
timezonefinder
Fast, fully offline timezone lookup for any WGS84 coordinate on earth
timeago-react
A tiny React component that renders live, auto-updating relative timestamps like "3 hours ago".
timeago
Format Python datetimes into human-friendly '3 hours ago' relative time strings across 40+ locales.
later
Composable library for defining recurring schedules and calculating their next or previous occurrences.
