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056. to unix epoch, from unix epoch

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long hundredM = 100*1000*1000;
long sec = dt.ToFileTimeUtc() / hundredM;
long epoch = sec - 1164444480;

long ft = (epoch + 1164444480) * hundredM;
Date dt2 = DateTime.FromFiltTimeUtc(ft);

Java

long epoch = dt.getTimeInMillis()/1000;

Date dt2 = new Date(epoch * 1000);

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D

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