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Round Serial Date Numbers or Date Vectors

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Round Serial Date Numbers or Date Vectors



03 Dec 2012 (Updated )

Round Serial Date Numbers or Date Vectors to the nearest desired unit (round/floor/ceiling).

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### Why This Function? ###

# Round dates to the nearest year, month, day, hour, minute, or second.
# Choice of rounding, floor or ceiling.
# Input either Serial Date Numbers in a column vector, or Date Vectors in a matrix.
# Output is a column vector of Serial Date Numbers.

### Examples ###

Examples use the date+time described by the vector [1999,1,3,15,6,48.0568].

 ans = [1999,1,3,15,6,48]

 ans = [1999,1,3,15,6,48]

 ans = [1999,1,3,15,7,0]

datevec(dateround([1999,1,3,15,6,48.0568],5)) % 5=='minute'
 ans = [1999,1,3,15,7,0]

 ans = [1999,1,3,15,6,0]

 ans = [2000,1,1,0,0,0;1999,12,31,23,59,59]


This file inspired Iso 8601 Date String To Serial Date Number and Date Vector/Number To Iso 8601 Date String.

Required Products MATLAB
MATLAB release MATLAB 7.11 (R2010b)
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Comments and Ratings (3)
14 Aug 2014 Jeff Jackson

Jeff Jackson (view profile)

14 Aug 2014 Jeff Jackson

Jeff Jackson (view profile)

16 Apr 2013 Jeff Harris

Nicely done. It is useful to have a time rounding fn to determine if times are equal within a tolerance, especially if they may have lost significant digits.

10 Dec 2012

- Fix bug in 'ceiling'.
- Unit tokens changed to match datestr8601/datenum8601 tokens.
- Simplify date format selection code.

21 May 2013

- Now only returns Date Numbers. This simplifies the code and the help comments.

24 Jun 2013

- Fixed incorrect order when rounding multiple dates.
- Improve internal precision management.

08 Jul 2013

- Revert conversion precision adjustment to original value.

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