And now something totally wierd: if anyone has had the task to convert data from Clarion's TPS database files (anyone still remembers Clarion?), (s)he will have a problem of converting date fields. Clarion stores dates as long values in it's own format, which is not Unix Timestamp or anything similar - it's just Clarion. Well, after some time spent with a try-error-tryagain method, I found out that the "basic" date is 28.12.1800, and the long value is number of days that have passed after that, Clarion's TPS database does not have the datetime field, so you don't have to bother with time part.
There is a VBA function for converting these values in MS Access, but it would look more-less the same in any normal programming language.
Public Function GetClarionDate(ClDate)
If ClDate = 0 Then
GetClarionDate = DateAdd("d", CLng(ClDate), CDate("12/28/1800"))
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