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As indicated, avoidng the leap second hole means that it only requires time to cover a single day. Something that the Firebird TIME value does nicely, but which does not cater for negative times. So we end up really needing to have a signed floating point number for the time element, with a count of seconds. Fractions of a day is easy, and the only fiddle is a list of leap second day flags. But this verion of TIME can be used for both clock, and the offsets for both LMT and Time Zone rules.
Extra fields to follow ... Calendar, Time Zone, Location and Versioning
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Extra Material
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ISO8601 - Data elements and interchange formats – Information interchange – Representation of dates and times
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RFC3339 - Date and Time on the Internet: Timestamps