java - conversion to GMT giving problems during DST -


i facing problem in our existing application time entered employee (from org/store using time clock application) first converted gmt , stored in db. , displaying back, time in gmt converted store local time zone , displayed. in of cases works fine not when time zone moves dst , vice versa.

let me more specific. suppose standard time zone of store gmt-8 , employee punches @ 08:00 in morning, time converted gmt gives 16:00 , stored in db. conversion process first converts 08:00 store local time somehow gives 17:00 cet , 17:00 cet converted gmt gives 16:00 cet.

but if take example of 31 march when dst happens 02:00 becomes 03:00 am. suppose emplyoee punches @ 18:00 (on 30 march) returns me 04:00 cest during first conversion local , when convert gmt gives 03:00 cest. while converting gives 19:00 not correct. design says local times converted utc , stored in db if still utc should store 02:00 , not 03:00 because gmt/utc not have dst.

the code used conversion is:

step 1

final date localpunchdatetime = r3valconverter.convertfromtimezone(tedata.m_dttm,                                                  timezone.gettimezone("gmt-8"));

step 2

tedata.m_dttm = r3valconverter.converttogmt( localpunchdatetime );

r3valconverter.java

public static date convertfromtimezone(final date dtsrc, final timezone tzsrc)     {          final sisdatetime dttmtemp = new sisdatetime(dtsrc, timezone.getdefault());         final sisdatetime dttmsrc = new sisdatetime( dttmtemp.getyear(), dttmtemp.getmonth(),                                                       dttmtemp.getdate(), dttmtemp.gethour(),                                                       dttmtemp.getminute(), dttmtemp.getsecond(),                                                       tzsrc );          return dttmsrc.todate();                                                            }

sisdatetime

gregoriancalendar m_cal;  public sisdatetime(date dt, timezone tz) throws sisdatetimeexception     {          m_cal = new gregoriancalendar(tz);         m_cal.settime(dt);         resetmillis();     }

the other sisdatetime method using same gregoriancalendar.

i appreciate in regard. assuming here have problem here in first step dont know solution @ moment.

you have store utc + current offset in seconds local time utc in db. if want preserve local time, need pair (utc time, offset)

you use timezonewithoffsetfromgmt (or simmiliar named)


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