Converting UNIX timestamp using ctime

Question

I have a unix time stamp as follows

  char timestamp[100];
  strcpy(timestamp,"701729943");
  time_t timeval=ctime(timestamp);
  printf("Time %s",timeval);

If the check the value of the timestamp in the online unix time convertor it shows 27th march 1992, but if the check the program's output it shows feb 25,1996. How to rectify this?

Answer 1

You're using ctime the wrong way around: it expects a pointer to a time_t and returns a string, whereas you're passing it a string and expect it to return a time_t . Does your compiler not warn you about that?

Anyway, it is meant to be used this way:

time_t timeval = 701729943;
printf("Time %s", ctime(&timeval));

If you only have the UNIX timestamp as a string, use strtoul or atoi to so to make a time_t from it, then do this.