计算目标C中的时差

Question

我在NSString中有2次以12小时格式(10-09 PM)或24小时格式(18-12)的值.如何计算两者之间的时差？(两个日期将是12小时或24小时格式,不是混合格式)

Answer 1

NSDateFormatter *df=[[NSDateFormatter alloc] init];
// Set the date format according to your needs
[df setDateFormat:@"MM/dd/YYYY hh:mm a"]; //for 12 hour format
//[df setDateFormat:@"MM/dd/YYYY HH:mm "]  // for 24 hour format
NSDate *date1 = [df dateFromString:firstDateString];
NSDate *date2 = [df dateFromString:secondDatestring];
NSLog(@"%@f is the time difference",[date2 timeIntervalSinceDate:date1]);
[df release];

希望这可以帮助