將時間格式轉換爲相對時間目標C

Question

如何將2011-05-08T22：08：38Z轉換爲目標C中的相對時間格式？

Answer 1

// create a date formatter 
NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; 
// set the formatter to parse RFC 3339 dates 
[formatter setDateFormat:@"yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'"]; 
// the formatter parses your date into an NSDate instance 
NSDate *date = [formatter dateFromString:@"2011-05-08T22:08:38Z"]; 

// now to get relative information you can do things like this, which 
// will give you the number of seconds since now 
NSTimeInterval secondsFromNow = [date timeIntervalSinceNow]; 

// or this, which will give you the time interval between this data 
// and another date 
NSTimeInterval secondsFromOther = [date timeIntervalSinceDate:someOtherDateInstance];