Development of the Roman Calendar


Roman Calendars — in Transition


The dates displayed on this page show the transitions of the earliest Roman calendars to the last revised version.


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Roman calendars from
Romulus (738 B.C.) to
Pope Gregory XIII (A.D. 1582)



  Romulus     Numa    Council of
Decemvirs 
  Julius     Augustus     Gregory XIII  
Circa
 738 B.C. 
  713 B.C.     451 B.C.     47 B.C.     8 B.C.    Europe
A.D. 1582
 England
A.D. 1752
Months
# Days
Months
# Days
Months
# Days
Months
# Days
Months
# Days
Months
# Days
           
Martius
31
Januarius
29
Januarius
29
Januarius
31
 Januarius
31 
 January
31  
 Aprilis
30 
 Martius
31 
 Februarius
28 
 Februarius
29/30 
 Februarius
28/29 
 February
28/29 
Maius
31
Aprilis
29
Martius
31
Martius
31
 Martius
31 
 March
31 
Junius
30
Maius
31
Aprilis
29
Aprilis
30
 Aprilis
30 
 April
30 
Quintilis
31
Junius
29
Maius
31
Maius
31
 Maius
31 
 May
31 
Sextilis
30
Quintilis
31
Junius
29
Junius
30
 Junius
30 
 June
30 
 Septemris
31 
Sextilis
29
Quintilis
31
Julius
31
 Julius
31 
 July
31 
Octobris
30
 Septembris
29
Sextilis
29
Sextilis
30
 Augustus
31 
 August
31 
Novembris
31
Octobris
31
 Septembris
29 
Septembris
31
 Septembris
30 
 September
30 
 Decembris
29 
 Novembris
29 
Octobris
31
Octobris
31
 Octobris
31 
 October
31 
    Decembris
29 
 Novembris
29 
Novembris 31  Novembris
30 
 November
30 
    Februarius
28 
Decembris
29
Decembris
30
 Decembris
31 
 December
31 
                 
 304
days 
 355
days 
 355
days 
 365.25
days 
 365.25
days 
 365.2422
days 


You may go to one of the Roman-modern months of your choice by clicking on the one you desire.

January February March April
May June July August
September October November December


Procrastination is the thief of time.
Television does a pretty good job, too.

-Robert Orben



Permanence is a man-made fantasy smiled on by time.

-Paul von Ringelheim



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