c - mktime() giving different results for same input in different timezone -


here piece of code converting fri jan 1 00:00:00 ist 1970 epoch 

 memset(&date_st,0,sizeof(struct tm));  date_st.tm_year = 70;  date_st.tm_mon  = 0;  date_st.tm_mday  = 1;  date_st.tm_hour = 24;  date_st.tm_min  = 0;  date_st.tm_sec  = 0;  date_st.tm_isdst = 0 ;   date_in_seconds = mktime( &date_st );

the code running on 2 servers having different time zones

server_1!:user_1> tue aug 25 11:03:51 idt 2015

server_2!:user_2> tue aug 25 05:05:03 clt 2015

now code gives different output on different servers same input fri jan 1 00:00:00 ist 1970

server_1 -> 79200 server_2 -> 100800

can suggest why output different? , how can make same {i want same} ?

that's timezones about, local time different.

you might want try gmtime function instead, if want common reference time.


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