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It is assumed that 7-day weeks have formed an uninterrupted sequence since ancient times.
Thus, the day of the week can be obtained from the remainder of the division of the Julian date by 7.
(The Unix cal command for systems manufactured in the U. reflects the 1752 changeover.) For a list of when certain countries switched to the Gregorian calendar, see Claus Tøndering's Calendar FAQ. For more information on the API, please see the documentation page.
For further information on calendars, see Richards, E.
As used here, the two calendars have identical month names and number of days in each month, and differ only in the rule for leap years.Specifically, for dates on or before 4 October 1582, the Julian calendar is used; for dates on or after 15 October 1582, the Gregorian calendar is used.Thus, there is a ten-day gap in calendar dates, but no discontinuity in Julian dates or days of the week: 4 October 1582 (Julian) is a Thursday, which begins at JD 2299159.5; and 15 October 1582 (Gregorian) is a Friday, which begins at JD 2299160.5. This page allows you to interconvert dates in a variety of calendars, both civil and computer-related.All calculations are done in Java Script executed in your own browser; complete source code is embedded in or linked to this page, and you're free to download these files to your own computer and use them even when not connected to the Internet.
The Roman calendar organized its months around three days, each of which served as a reference point for counting the other days: The remaining, unnamed days of the month were identified by counting backwards from the Kalends, Nones, or the Ides.