Question

i have a file, ‘date.txt’ which has date in it. Like,
Mon Oct 13 09:37:08 2009.

Now i want to compare this date with system date. How can i compare dates in C++.?

I used this code to get the contents from the file ‘date.txt’

    string date;
    while ( inDateFile >>date) //inDateFile is an ifstream object 
           cout<<date<<endl;

And this code to get system date,

  time_t timer;
  struct tm *tblock;
  timer = time(NULL);
  tblock = localtime(&timer);
  string str = asctime(tblock);

Now how can i compare these two dates.?

Answer 1

Parse values, use std::mktime function to get time_t and now use std::difftime to get the difference.