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If memory serves me right, the use of 24:00:00, to refer to the end of the day, is to accomodate previous (and long standing) standards used by the military. As such ISO 8601 indicates:

<quote>
day, calendar
time-interval starting at [0000] and ending at [2400] (which is equal to the beginning of the next calendar day);
typically a calendar day has a duration of 24 h
</quote>

It is confusing to have two accepted ways to represent the same point in time and I do recall that this has always been a sore point with the chief database architect back in Rochester -- but a point that he (and us) have to live with...

Bruce Vining

<snip>
Larry Ducie <Larry_Ducie@xxxxxxxxxxx> wrote:
Hi Peter,


First of all, I'd like to know whether January 1, 2000 00:00:00 is the
same as January 1, 2000 24:00:00 (I would think that the latter actually
means January 2).

Second, which one is correct?


There are three different answers to this question:
1) Using standards agreed for formulating the appropriate representation of
a designated time.
In this case ISO 8601 is your guide and would suggest that they are the
same. Both are correct.
</snip>

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