Date compare

[mrexp21]

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.?