SEJARAH PERKEMBANGAN KALENDAR

SEJARAH PERKEMBANGAN GREGORIAN KALENDAR

Romulus kalendar hanya ada 10 bulan sahaja (lebih kurang 753 BC)

Months
Martius	31
Aprilis	30
Maius	31
Iunius	30
Quintilis	31
Sextilis	30
September	30
Oktober	31
November	30
December	30
Jumlah hari	304

61 hari daripada musim sejuk tidak di letakkan atau dinamakan pada mana-mana bulan.

Kalendar Numa (lebih kurang 713 BC)
- Numa Pompilius hanya mahu jumlah hari dalam setahu sebanyak 354 hari sahaja

Civil calendar		Religious calendar
Berdasarkan kepada Macrobius dan Plutarch	Berdasarkan kepada Ovid (modern order due to Decemviri 450 BC)	Berdasarkan kepada Fowler
Ianuarius(29)	Ianuarius	Martius
Februarius(28)	Martius	Aprilis
Martius (31)	Aprilis	Maius
Aprilis (29)	Maius	Iunius
Maius (31)	Iunius	Quintilis
Iunius (29)	Quintilis	Sextilis
Quintilis (31)	Sextilis	September
Sextilis (29)	September	October
September (29)	October	November
October (31)	November	December
November (29)	December	Ianuarius
December (29)	Februarius	Februarius

Kalendar Julian

Months	Lengths before 45 BC	Lengths as of 45 BC
Ianuarius	29	31
Februarius	28 (leap years: 23 or 24)	28 (leap years: 29)
Martius	31	31
Aprilis	29	30
Maius	31	31
Iunius	29	30
Quintilis (Julius)	31	31
Sextilis (Augustus)	29	31
September	29	30
Oktober	31	31
November	29	30
December	29	31
Intercalaris	0 (leap years: 27) (inserted between the shortened February and March)	(abolished)

Kalendar Gregorian

Bulan	Jumlah Hari
January	31
February	28 or 29
March	31
April	30
May	31
June	30
July	31
August	31
September	30
October	31
November	30
December	31