Some days/dates are not present in all (Gregorian) calendar months. Specifically, five months of the year do not have a '31st', and February does not have a '29th' (except in Leap years) nor a '30th'.

Is there a generic term for these days/dates that are present only in selected months?

Example sentence:

If recurring event would fall on a [date-not-present-in-that/all-calendar-month(s)], its occurrence will fall on the last day of that month.

  • 1
    Hmm... Is there a name for those days in your language? I don't think there's a specific name for it... :-/
    – Neeku
    Aug 15, 2014 at 9:52
  • great question, but I believe there is no real term for this in English. Maybe "longer-month extra-days" would work in say a technical discussion. Don[t forget "31" is the only one you are really discussing. (February is a special case.)
    – Fattie
    Aug 15, 2014 at 10:46
  • 1
    Days after 28th are in the fifth week of the month (or "after the end of the fourth week" if that's easier to visualise). Only a comment, because it's really too short for an answer.
    – Andrew Leach
    Aug 15, 2014 at 17:46
  • 1
    In MS Outlook, if you enter a monthly recurring event for the X day of the month (X = 29, 30, or 31) you get a warning message "Some months have fewer than X days. For these months, the occurrence will fall on the last day of the month."
    – TrevorD
    Jun 14, 2016 at 10:30
  • 1
    The term, if one were to find one, would almost certainly be from Latin, and would refer to the fact that the extra days were "stolen" from other months (particularly February) to glorify the specific deities and Roman emperors for whom the recipient months were named.
    – Hot Licks
    Jun 14, 2016 at 11:50

2 Answers 2


Hey I've thought of something I've seen in computer programming for these issues:


ie, the days bigger than 28. you could also say "super-28 days" or similar.

I don't know if it's relevant to your situation.

  • Yeah, that's clever; I'm actually writing a software spec. :D
    – Czar
    Aug 16, 2014 at 0:45
  • hope it helps, ciao !
    – Fattie
    Aug 16, 2014 at 13:25

February 29 is called the "leap day" because it's not in every year. See http://en.wikipedia.org/wiki/February_29

That doesn't answer your question though. Sorry I don't have enough reputation points yet to just post a comment

  • 3
    February 29 (and other similar days in other calendars) are technically called intercalary days.
    – Andrew Leach
    Aug 15, 2014 at 17:42

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.