Ultimate Date Converter (UDC) helps you to convert a date in one calendar system to another calendar.

◉ This application provides all following calendars:
=== Archaic calendars ===
▸ French Republic (Julian, Gregorian and Equinox computation)
▸ Soviet (5 days)
▸ Maya
▸ Armenian
▸ Chinese
▸ Celtic tree
▸ Egypte antique
▸ Swedish
▸ Slavic-Aryan
▸ Byzantine
▸ Florentine
▸ Pisan

=== Still in use ===
▸ Gregorian
▸ Julien

◉ 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.

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
◉ New calendars:
▸ Byzantine calendar
▸ Florentine calendar

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

SF Presidio ,

What’s in a calendar?

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.


Franck Sauvaire
28.6 MB

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


English, French, Russian

Age Rating


  • Family Sharing

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

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