You need to take 2 step:
- convert string to
NSDate
- convert date to timeStamp
like below:
- (void) dateConverter{
NSString *string = @"22/04/2013 05:56";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
// this is imporant - we set our input date format to match our input string
// if format doesn't match you'll get nil from your string, so be careful
[dateFormatter setDateFormat:@"dd/MM/yyyy hh:mm"];
NSDate *date = [[NSDate alloc] init];
// voila!
date = [dateFormatter dateFromString:string];
NSLog(@"dateFromString = %@", date);
//date to timestamp
NSTimeInterval timeInterval = [date timeIntervalSince1970];
}
Then to achieve something like time ago following method will help, although it's not totally for you bu i believe you can modify it to help you!
- (NSString *) timeAgoFor : (NSDate *) date {
double ti = [date timeIntervalSinceDate:[NSDate date]];
ti = ti * -1;
if (ti < 86400) {//86400 = seconds in one day
return[NSString stringWithFormat:@"Today"];
} else if (ti < 86400 * 2) {
return[NSString stringWithFormat:@"Yesterday"];
}else if (ti < 86400 * 7) {
int diff = round(ti / 60 / 60 / 24);
return[NSString stringWithFormat:@"%d days ago", diff];
}else {
int diff = round(ti / (86400 * 7));
return[NSString stringWithFormat:@"%d wks ago", diff];
}
}