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Similar to Julian calendar

Julian

References: 		Italy

Revised Julian

References: 		Italy

Gregorian & Julian Gregorian

References:
Variants:
  • Gregorian Proleptic
  • Gregorian Astronomic
  • Custom Gregorian Astronomic
  • Julian/Gregorian Astronomic
 Italy

Romanian

References: 		Roumania

Breton

References: 		Breton

National calendars

Bikram Sambat

References: 		Nepal

Thai solar

References:
Variants:
  • Rattanakosin
  • Suriyakati
 Thailand

Indian

References: 		India

North Korean (Juche)

References: 		North Korea

Bengali

References: 		Bangladesh

Japanese calendars

Gregorian structure

References: 		Japan

Jimmu Tenno

References: 		Japan

Nengo

References: 		Japan

Archaic calendars

Antique armenian

References:
Variants:
  • Starts in 552 AD
  • Starts in 2492 BCE
 Armenia

French Republic

References:
Variants:
  • Julian
  • Gregorian
  • Vernal equinox
 France

Soviet, 5 days based

References: 		CCCP

Mayan

References: 		Maya

Chinese

References:
Variants:
  • Starts in 2697 BCE
  • Starts in 2698 BCE
 China

Celtic tree

References:
Notes:
  • Years are aligned with the Gregorian calendar.
 Celtic

Antique Egypt

References:
Notes:
  • Start the 19th of July -4242 (Julian).
  • Decree of Canopus implemented the 29th of August -22 (Julian).
 Antique Egypt

Swedish

References: 		Sweden

Slavic-Aryan

References: 		Slavic-Aryan

Byzantine

References:
Variants:
  • Original version
  • Alexandrian era
  • Chronicon Paschale
 Byzantine

Florentine

References: 		Florentine

Pisan

References: 		Pisan

Islamic calendars

Badi

References:
Variants:
  • Version aligned with Gregorian calendar (before 2015)
  • Version aligned with the northward equinox (after 2015)
 Indonesia

Islamic

References:
Variants:
  • Common version
  • Standard version
  • Umm al Qura
  • Indian version
  • Koweiti version
  • Version from Elias de Nisibi
 Saoudi Arabia Kuwait India

Persian

References:
Variants:
  • Jalaali
  • Khayyam
 Iran

Berbère

References: 		Berber

Afghanistan

References:
Afghanistan

Kurdish (modern)

References: 		Kurdishtan

Reform calendars

Bonavian Civil

References: 		UK

Perpetual fixe

References: 		UK

Positivist

References: 		France

Symmetry

References:
Variantes :
  • Symmetry010
  • Symmetry445
  • Symmetry454
 Canada

World

References: 		UN

Dee

References:
Variants:
  • Dee
  • Dee Cecil
 UK

World season (Isaac Asimov)

References: 		US

Tranquility

References: 		US

Pax

References: 		US

Hanke-Henry

References: 		US

Tabot

References: 		Jamaica

Pataphysic

References: 		France

Holocene

References: 		US

Professional usage

ISO week date

References: 		EU

US week date

References:
Notes:
  • Week 53 may overlap week 1.
 US

ISO ordinal date

References: 		EU

Julian day counters

References:
Variants:
Name Start date Start time
Julian day counter 1st January 4713 BC midday
Astronomical Julian day counter 1st January 4713 BC noon
Custom Julian day counter 1st January 4713 BC by default midday
Custom Julian day counter 1st January 4713 BC by default noon
Rata die 1st January 1 (gregorian) noon
Lilian day counter 15th of October 1582 noon
ANSI day counter 1st of January 1601 noon
Reduced day counter 17th of Novembre 1858 midday
Modified day counter 17th of November 1858 noon
Dublin day counter 31st of December 1899 midday
Truncated day counter 24th of May 1968 noon
CNES 1st of January 1950 noon
CCSDS 1st of January 1958 noon
LOP 1st of January 1992 noon
France UK US

Masonic

References: 		Masonic

Liturgical calendars

Coptic

References: 		Coptic

Ethiopian

References:
Variants:
  • Standard
  • Anno Mundi according to Panadoros
  • Anno Mundi according to Anianos
  • Era of Martyrs
 Ethiopia

Hebrew

References: 		Israel

Nanakshahi

References: 		Nanakshahi

Myanmar

References: 		Myanmar

Discordian

References:
Variants:
  • Gregorian based
  • Julian based
 Discordian

Fiction calendars

Star Trek™ © 2004 Paramount Pictures

References: 		Stars