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

◉ 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

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.

Mike Mpls ,

Piece of crap

Hebrew calendar does not show the day and year in Hebrew characters. What a joke!! What a rip off. If you need a Hebrew calendar do not buy this one it's a rip off. I want my dollar back. Also I noticed that the actual Hebrew spellings of the months are incorrect. Whoever put this calendar together absolutely does not know what they're doing and does not know the Hebrew language. what a joke

Ajtcanvaz ,

Rip off

The app really doesn't give the different calculator conversions that you expect, just lays out reference guides and links to Wikipedia on the different calendars while if one selects a certain calendar you get redirected to that calendar app that you must pay for. Don't click on this. Waste of time.


Franck Sauvaire
45.5 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, French, Russian

Age Rating
Rated 4+
© 2012-2017 Franck Sauvaire
In-App Purchases
  1. Hebrew -common- $0.99
  2. Persian -Jalaali- $1.99
  3. Mayan $0.99


  • Family Sharing

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

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