Life & fun · alternatives · 2026

Tzintl.js is a JavaScript library for converting dates and times across different time zones and locales. It helps developers build applications that need to display or calculate dates in multiple international formats… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Tzintl.js – International Date-Time Conversion launched in 2021; newer entries below may have overtaken it.

1. 1
   Fast 2kB date library alternative to Moment.js with the same API▲122

   ⏰ Day.js 2kB immutable date-time library alternative to Moment.js with the same modern API - iamkun/dayjs

   2018 · github.com · its alternatives →

2. 2
   I made a tool to compare time zones▲758

   Timezone converter and world clock by time.fyi is a simple, fast and easy to use app to convert timezones and check the current time in different cities around the world.

   2024 · time.fyi · its alternatives →

3. 3
   My Time Zone▲382

   Automatic time zone conversion tool

   2017 · its alternatives →

4. 4
   uPlot.js – An exceptionally fast, tiny time series chart▲260

   📈 A small, fast chart for time series, lines, areas, ohlc & bars - leeoniya/uPlot

   2019 · github.com · its alternatives →

5. 5AD
   A date range picker for Twitter Bootstrap▲363

   2012 · dangrossman.info · its alternatives →

6. 6
   Moment.js▲279

   Parse, validate, manipulate, and display dates in JavaScript

   2015 · momentjs.com · its alternatives →

7. 7
   Tztail – View logs in the timezone you want▲53

   tztail (TimeZoneTAIL) allows you to view logs in the timezone you want - thecasualcoder/tztail

   2018 · github.com · its alternatives →

8. 8
   Watzon▲78

   Elegant timezone converter + reminder

   2016 · silesius.se · its alternatives →

9. 9
   TimeInZone▲153

   Check times across multiple timezones instantly

   2023 · timeinzone.com · its alternatives →

10. 10
    Time Travel▲89

    Convert timezones faster than ever!

    2020 · timetravel.sharath.app · its alternatives →

11. 11
    Day.js▲10

    2KB immutable date time library alternative to Moment

    2018 · github.com · its alternatives →

12. 12
    Tsayt▲66

    Beautiful time and currency converter

    2021 · play.google.com · its alternatives →

13. 13
    Day.js 1.6 locale and plugins 2kb moment.js alternative with same API▲6

    ⏰ Day.js 2kB immutable date-time library alternative to Moment.js with the same modern API - iamkun/dayjs

    2018 · github.com · its alternatives →

14. 14
    Summarize your time availability in seconds▲109

    Simple tool to share your availability as plain text. Select time slots, convert timezones, copy and send. No calendar links needed.

    2020 · whattime.today · its alternatives →

15. 15
    Paste A Date▲83

    Quickly convert timestamps into other timezones

    2017 · its alternatives →

16. 16
    Combining UTC and local times (time zones) in one new clock▲101

    2021 · thehtime.com · its alternatives →

17. 17
    Convert Time▲11

    Instantly convert times across 45+ timezones

    Jan 2026 · chromewebstore.google.com · its alternatives →

18. 18
    MeetWhen▲73

    Figure out meeting times across timezones without the hassle

    2020 · meetwhen.herokuapp.com · its alternatives →

19. 19
    yourtime.zone▲73

    Automatically show an event in the visitors local time.

    2017 · its alternatives →

20. 20
    GMT NOW▲83

    A modern progressive web app for timezone conversion.

    2020 · its alternatives →

21. 21
    Bramhaand▲56

    Clock, timezone, meeting planner

    2021 · apps.apple.com · its alternatives →

22. 22
    Just right and light-weight date time library for JavaScript▲5

    Light-weight, type-safe, immutable and chainable without dependencies. Handles UTC (default) and the local time of the environment, ambiguous daylight saving time strictly.

    2025 · github.com · its alternatives →

23. 23
    Intl-T.▲2

    A Fully-Typed Node-Based i18n Translation Library for TS

    May 2026 · intl-t.dev · its alternatives →

24. 24
    a18n – Automated I18n JavaScript Solution▲39

    Automated I18n solution for JavaScript/TypeScript/React - FallenMax/a18n

    2020 · github.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →