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Ultimate Date Converter

By Franck Sauvaire

This app is only available on the App Store for iOS devices.


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 in 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


iPhone Screenshot 1
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Ultimate Date Converter
View in iTunes
This app is designed for both iPhone and iPad
  • Free
  • Category: Utilities
  • Updated:
  • Version: 2.2.8
  • Size: 45.5 MB
  • Languages: English, French, Russian
  • Seller:

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

Customer Ratings

Current Version:
All Versions:

Top In-App Purchases

  1. Hebrew -common-$0.99
  2. Persian -Jalaali-$1.99
  3. Mayan$0.99
  4. Ethiopian$1.99
  5. Islamic -common-$0.99
  6. Masonic$2.99
  7. Coptic$1.99
  8. Bahai$0.99
  9. Stardate (23rd century)$0.99
  10. Islamic -standard-$0.99