Time / Date Tracking

Hi, Well i've never tried this, so i figured i'd get some info on the best technique for Time/Date Tracking... I'm going to be reading a bunch of log files with time and date stamps in them.. I want to pick out the time and date, and sort each Log line by day.. then seperate by each day of the month. And also have options to purge after x amount of days. Anways is there is easy way to go about this, the courius problem i was thinking i was going to run into for example: if i keep track of statistics, and have it where the "end user" can set how many days they would like the program to keep track of everything for.. example 7 days.. and it starts off on 11/28/02 and goes till 12/05/02, whould I have to make my own calander to keep track of the roll over for each month. Or is there something that already does this?? I'm also trying to think of the best way to store the date and time in a struct.. for comparision and subtracting / dividing time... any suggestions would help a lot.. i'm trying to keep this cross platform for linux as well... [edited by - tonic151 on December 3, 2002 5:20:29 PM]