Info Catalog coreutils: Relative items in date strings coreutils: Date input formats coreutils: Seconds since the Epoch

coreutils: Pure numbers in date strings

 
 29.8 Pure numbers in date strings
 =================================
 
 The precise interpretation of a pure decimal number depends on the
 context in the date string.
 
    If the decimal number is of the form YYYYMMDD and no other calendar
 date item (⇒Calendar date items) appears before it in the date
 string, then YYYY is read as the year, MM as the month number and DD as
 the day of the month, for the specified calendar date.
 
    If the decimal number is of the form HHMM and no other time of day
 item appears before it in the date string, then HH is read as the hour
 of the day and MM as the minute of the hour, for the specified time of
 day.  MM can also be omitted.
 
    If both a calendar date and a time of day appear to the left of a
 number in the date string, but no relative item, then the number
 overrides the year.
 

Info Catalog coreutils: Relative items in date strings coreutils: Date input formats coreutils: Seconds since the Epoch