Ultimate Date Converter (UDC) helps you to convert a date in one calendar system to another calendar.
More than 100 calendars are now available.

◉ Lot of calendars are yet supported:
=== Still in use ===
▸ Gregorian, Julien, Revised Julian
▸ Custom Gregorian calendar
▸ Romanian
▸ Bikram Sambat
▸ Thai
▸ Breton
▸ North Korea

=== Japanese calendars ===
▸ Anno Domini based
▸ Jimmu Tenno
▸ Nengo Era

=== Archaic calendars ===
▸ French Republic (Julian, Gregorian and Equinox computation)
▸ Soviet (5 days)
▸ Maya
▸ Armenian
▸ Chinese
▸ Celtic tree
▸ Antique Egypt
▸ Swedish
▸ Bizantine

=== Islamic and Hebrew calendars ===
▸ Baha'i (before and after 2015)
▸ Hebrew
▸ Islamic (4 versions + Umm al Qura)
▸ Persian (Jalaali and Khayyam)
▸ Berber
▸ Afghan

=== Reform calendars ===
▸ World calendar
▸ Symmetry010, Symmetry454
▸ Perpetual Fixe
▸ Bonavian Civil
▸ Positivism
▸ Dee & Dee Cecil
▸ World Season (Isaac Asimov)
▸ Tranquility
▸ Hanke-Henry
▸ Pax
▸ Tabot
▸ Pataphysic
▸ Holocene

=== For professional usage ===
▸ ISO week date, US week date
▸ Day counter: Julian, Rata Die, Lilian, Dublin, Reduced, Modified, CNES, CCSDS, LOP
▸ Custom Day counter
▸ ISO ordinal calendar
▸ Masonic

=== Liturgical calendars ===
▸ Nanakshahi
▸ Coptic
▸ Ethiopian
▸ Myanmar
▸ Discordian

=== Fiction ===
▸ Star date (3 versions)

◉ Following calendars are proposed by default with the application:
▸ Gregorian (astronomic),
▸ Julien (proleptic and orthodox),
▸ World calendar
▸ Few reform calendars and day counter calendars

◉ Additional features:
You can easily compute the number of days between two dates of two different calendars.
You can as well export a date converted in all calendars format to Note or Mail.
The ISO/US week date number is also displayed with the icon of the application, so you won't lose time to open the application.

What’s New

Version 2.2.8

This app has been updated by Apple to use the latest Apple signing certificate.

◉ Bug fixing:
▸ It was needed to press twice the button "language" depending on the calendar
◉ New features:
▸ Remove Facebook's button (iPad only)
▸ iOS10 and Xcode8 support
▸ Remove button 'sort'
▸ Remove iAds (deprecated)
▸ Remove the possibility to change the font of characters
▸ Badi calendar: add day feasts
▸ French Republic (equinox): change computation algorithm
▸ Julian day counters: add decimal number
◉ New calendars:
▸ New Badi calendar aligned with the northward equinox starting in 172 as specified by the House of Justice
▸ Day counter CNES
▸ Day counter CCSDS
▸ Day counter LOP
▸ Myanmar calendar
▸ Byzantine calendars
▸ Discordian calendar

Ratings and Reviews

4.3 out of 5
3 Ratings

3 Ratings

PryanksterNB ,

A few calendars included

It's nice that some calendars are included. I will be buying some of the others.

SF Presidio ,

Elegant and fun approach to time

This series of easy to use calendars allow you to convert dates from one system to another. It includes ancient and modern timekeeping as well as a science fiction offering. These apps are an excellent investment that are not only useful but also fun.
Calendars are more than a way to name units of time. They are a reflection of a people’s history. The establishment of “day one” is usually related to a cherished event. The naming of days and units above that reflect history since “day one”. The events memorialized may be triumphant or tragic but they are always important. If you understand the calendar of another people you begin to learn about their culture.

Galactic Groundhog ,

Months need their number as well as their name

Months are shown with their names but the app should also provide the month's ordinal number within the given year.

App Privacy

The developer, Franck Sauvaire, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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