**main.m**
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[]) {
@autoreleasepool {
// Figure out how many seconds i have been alive.
// Creating a new date object that is set to my birthday.
NSDateComponents *comps = [[NSDateComponents alloc] init];
comps.year = 1983;
comps.month = 06;
comps.day = 15;
comps.hour = 03;
comps.minute = 00;
comps.second = 00;
NSCalendar *g = [[NSCalendar alloc] initWithCalendarIdentifier: NSCalendarIdentifierGregorian];
NSDate *dateOfBirth = [g dateFromComponents: comps];
// Measuring time in seconds since *dateOfBirth
NSDate *today = [[NSDate alloc] init];
double life = [today timeIntervalSinceDate: dateOfBirth];
NSLog(@"Since my birthday have passed %0.f", life);
}
return 0;
}