gmtime

[MayFlowerNew]

Hi,

is there any way to calculate other date&time like london, tokyo from gmtime?

Thanks in advance

 

[CodingNovice]

yeah simple if you know the time difference just add it to the hour member of the struct.

i.e. gmt to cet

#include <stdio.h>
#include <time.h>
#define CET (1)
int main ()
{
  time_t rawtime;
  tm * ptm;
  time ( &rawtime );
  ptm = gmtime ( &rawtime );
  printf ("CET now is :-%2d:%02d\n", ptm->tm_hour+CET, ptm->tm_min);
  return 0;
}

or very similar.

 

[MayFlowerNew]

Hi CodingNovice,
Thanks for the reply but say I am looking for date, time of tokyo. The timeoffset is 9 hours. if I add directly to the hour field it gives figure which is greater than 24 and naturally this dose not change the date field.

I am looking for something where we add the offset and it gives the new tm structure.

Thanks again

 

[cpjust]

Instead of modifying the tm struct, just modify the time_t by adding the time offset x 3600.

 

[MayFlowerNew]

Yes this sounds a good idea, let me try and get back to you..

Thanks a lot

 

[CodingNovice]

Im sure localtime can do it as well but I dont know anything about C locales.

 

[xwb]

Note that in some time zones like India, the offsets are on the half hour. eg Mumbai (Bombay) is 5.5 hours ahead of GMT.