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

◉ Lot of calendars are yet supported:
✸ Still in use:
▸ Gregorian, Julien, Revised Julian
▸ Custom Gregorian calendar
▸ Coptic, Ethiopian, 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

✸ Islamic and Hebrew calendars:
▸ Baha'i (indonesian)
▸ Hebrew (common and traditional)
▸ Islamic (4 versions + Umm al Qura) and Persian

✸ Reform calendars
▸ World calendar
▸ Symmetry010, Symmetry454 (2 versions), Symmetry445
▸ Perpetual Fixe
▸ Bonavian Civil
▸ Positivism
▸ New Earth
▸ 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 Day, Rata Die, Lilian Day, Dublin Day, Reduce Julian day, Modified Julian day
▸ Custom Day counter
▸ ISO ordinal calendar
▸ Masonic

✸ Fiction:
▸ Star date

◉ 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.