how to convert date to timestamp?

Question

How should I convert date format(dd-mm-yyyy) to timestamp value . Can anyone suggest code how to convert and where to put code .

Answer 1

It is good for you?

struct tm tm;
time_t fecha;
if ( strptime(timestamp, "%Y-%m-%d %H:%M:%S", &tm) != NULL )
  fecha = mktime(&tm);
else 

// Another thing