(tar.info)Time of day items
Time of day items ================= A "time of day item" in date strings specifies the time on a given day. Here are some examples, all of which represent the same time: 20:02:0 20:02 8:02pm 20:02-0500 # In EST (U.S. Eastern Standard Time). More generally, the time of the day may be given as `HOUR:MINUTE:SECOND', where HOUR is a number between 0 and 23, MINUTE is a number between 0 and 59, and SECOND is a number between 0 and 59. Alternatively, `:SECOND' can be omitted, in which case it is taken to be zero. If the time is followed by `am' or `pm' (or `a.m.' or `p.m.'), HOUR is restricted to run from 1 to 12, and `:MINUTE' may be omitted (taken to be zero). `am' indicates the first half of the day, `pm' indicates the second half of the day. In this notation, 12 is the predecessor of 1: midnight is `12am' while noon is `12pm'. (This is the zero-oriented interpretation of `12am' and `12pm', as opposed to the old tradition derived from Latin which uses `12m' for noon and `12pm' for midnight.) The time may alternatively be followed by a time zone correction, expressed as `SHHMM', where S is `+' or `-', HH is a number of zone hours and MM is a number of zone minutes. When a time zone correction is given this way, it forces interpretation of the time relative to Coordinated Universal Time (UTC), overriding any previous specification for the time zone or the local time zone. The MINUTE part of the time of the day may not be elided when a time zone correction is used. This is the best way to specify a time zone correction by fractional parts of an hour. Either `am'/`pm' or a time zone correction may be specified, but not both.
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