ios - Display current time in epoch

Question

I'm trying to display the current time in epoch, i'm not sure if this is correct, but i'm sure it's not since it's giving me an error:

NSDate *currentDate = [NSDate date];
NSDate *epochDate = [NSDate dateWithTimeIntervalSince1970:currentDate];

Any idea of how to accomplish this?

Answer 1

NSString *epochTime = @"1347522689";
NSTimeInterval epochInterval = [epochTime longLongValue];
NSDate *epochNSDate = [[NSDate alloc] initWithTimeIntervalSince1970:epochInterval];
NSDateFormatter *dateFormatterEpoch = [[NSDateFormatter alloc] init];
[dateFormatterEpoch setDateFormat:@"yyyy-MM-dd HH:mm:ss zzz"];
NSString *epochDate = [dateFormatterEpoch stringFromDate:epochNSDate];

NSDate *currentDateNSDate = [NSDate date];
NSDateFormatter *dateFormatterCurrent = [[NSDateFormatter alloc] init];
[dateFormatterCurrent setDateFormat:@"yyyy-MM-dd HH:mm:ss zzz"];
NSString *currentDate = [dateFormatterCurrent stringFromDate:currentDateNSDate];


NSLog(@"epochDate = %@",epochDate);
NSLog(@"currentDate = %@", currentDate);

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

NSUInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit | NSYearCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;

NSDateComponents *components = [gregorian components:unitFlags fromDate:epochNSDate toDate:currentDateNSDate options:0];

NSInteger year = [components month];
NSInteger months = [components month];
NSInteger days = [components day];
NSInteger hours = [components hour];
NSInteger min = [components minute];
NSInteger sec = [components second];


NSLog(@"Year Difference = %@
 Month Difference = %@
, Days Difference = %@
, Hours Difference = %@
 ,Minutes Difference = %@
 second Difference = %@
", [[NSNumber numberWithInteger:year] stringValue] ,[[NSNumber numberWithInteger:months] stringValue], [[NSNumber numberWithInteger:days] stringValue], [[NSNumber numberWithInteger:hours] stringValue], [[NSNumber numberWithInteger:min] stringValue],[[NSNumber numberWithInteger:sec] stringValue]);