Luke Ma [blog.lukema.net]

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Posted by:
Luke

Date Time Format

Posted at 11:30 PM on
August 31, 2006

Some APIs use them, some don't, but I'm a fan of sticking to ISO8601 for date/time. Note, though, that the spec allows two different ways of indicating GMT Offset:

This profile defines two ways of handling time zone offsets:

1) Times are expressed in UTC (Coordinated Universal Time), with a special UTC designator ("Z").
2) Times are expressed in local time, together with a time zone offset in hours and minutes. A time zone offset of "+hh:mm" indicates that the date/time uses a local time zone which is "hh" hours and "mm" minutes ahead of UTC. A time zone offset of "-hh:mm" indicates that the date/time uses a local time zone which is "hh" hours and "mm" minutes behind UTC.

A standard referencing this profile should permit one or both of these ways of handling time zone offsets.

The second option is quite nice and technically contains more info than the first even though both designate the same instant. But conforming to ISO8601 only requires that you handle ONE of those cases, not both. Watch out.

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