Calculation error when representing TDateTime (Delphi) as a Java Calendar object -

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Calculation error when representing TDateTime (Delphi) as a Java Calendar object -

delphi tdatetime epoch december 30, 1899, java calendar uses unix epoch january 1, 1970. next code:

calendar epoch = calendar.getinstance(timezone.gettimezone("utc")); epoch.set(1899, 12, 30, 0, 0, 0); epoch.gettimeinmillis();

gives -2206483199054 according manual calculations has -2209161600000. delta 2678400946 (31 days) come from? missing?

yes, can operate milliseconds workaround want know error comes from.

p.s. epoch instance of java.util.gregoriancalendar.

the month field 0-based, dec month 11, not 12. explains why you're off 31 days — wrapped around jan 30, 1900. can phone call setlenient(false) grab kind of error sometimes.

the set method sets 6 fields mentioned in arguments; leaves other fields unchanged, including millisecond field, explains why you're off slightly more 31 days.

the documentation advises phone call clear() first, may instead prefer phone call clear(calendar.millisecond) maintain time-zone info intact.

java delphi

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