日期与时间
1.NSDate *date = [NSDate date];
2.NSDate *date1 = [NSDate distantFuture];
3.NSDate *date2 = [NSDate distantPast];
4.NSTimeInterval time = [date2 timeIntervalSinceDate:date1];
5.NSDate *date3 = [NSDate dateWithTimeIntervalSinceNow:200];
6.NSDate *date4 = [date earlierDate:date3];
7.NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
formatter.dateFormat = @"yy-MM-dd HH:mm:ss";
NSString *dateString = [formatter stringFromDate:date4];
8.
NSDate *date5 = [formatter dateFromString:@"14-12-12 03:56:34"];
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