[Cppcms-users] booster::locale::date_time to timestamp conversion issues / basis for booster::locale::date_time

[Alexander M. <a....@ev...>]

Hello,

I'm trying to convert a date_time object into a simple timestamp e.g.:

// init environment...
std::locale::global(booster::locale::generator().generate(""));
cppcms::service srv(argc, argv);

// ....

// get some time some month ago..
booster::locale::date_time dtCurrentTime;
booster::locale::date_time dtSomeMonthAgo = dtCurrentTime - 
(booster::locale::period::month());

// get date_time for 1970-01-01 00:00:00
booster::locale::date_time dtStart(0);

// get timestamp
int iDifference = dtStart.difference(dtCurrent, 
booster::locale::period::second());

That code works fine on Machine A.. But when I'm running the program on 
Machine B I get weird results..
On Machine A the timestamp for Mon, 26 Oct 2015 12:37:12 GMT is 
1445863032. (correct)
On Machine B the timestamp for Mon, 26 Oct 2015 12:37:12 GMT is 
536870912. (wrong)

The times on the machines are equal too.. timedatectl:

Machine A:
Local time: Do 2015-11-26 14:25:12 CET
   Universal time: Do 2015-11-26 13:25:12 UTC
         Timezone: Europe/Berlin (CET, +0100)
      NTP enabled: yes
NTP synchronized: yes
  RTC in local TZ: no
       DST active: no
  Last DST change: DST ended at
                   So 2015-10-25 02:59:59 CEST
                   So 2015-10-25 02:00:00 CET
  Next DST change: DST begins (the clock jumps one hour forward) at
                   So 2016-03-27 01:59:59 CET
                   So 2016-03-27 03:00:00 CEST

Machine B:
Local time: Do 2015-11-26 14:25:38 CET
   Universal time: Do 2015-11-26 13:25:38 UTC
         RTC time: Do 2015-11-26 13:25:38
         Timezone: Europe/Berlin (CET, +0100)
      NTP enabled: yes
NTP synchronized: no
  RTC in local TZ: no
       DST active: no
  Last DST change: DST ended at
                   So 2015-10-25 02:59:59 CEST
                   So 2015-10-25 02:00:00 CET
  Next DST change: DST begins (the clock jumps one hour forward) at
                   So 2016-03-27 01:59:59 CET
                   So 2016-03-27 03:00:00 CEST


Maybe someone had the same issue and knows what the problem is?

I would appreciate any tip :-)

Thank you very much,

Alex