why converting a date to milisecond is different in java and c#

hi

i wan convert date milisecond.

i use cod in c# :

   datetime date = convert.todatetime("2014 / 07 / 28");              datetime jan1st1970 = new datetime(1970, 1, 1, 0, 0, 0, 0, datetimekind.utc);              double millis = (double)((date - jan1st1970).totalmilliseconds);

it returns 1406505600000

but change java , returns 1406489400000

simpledateformat sdf=new simpledateformat("yyyy-mm-dd");  date mdate=sdf.parse("2014 / 07 / 28");   double millis= mdate.gettime();

why different?

i not sure, thing can think of timezone difference or culture setting.

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