如何将两个给定时间与当前时间进行比较？ [英] How to compare two given times with current time?

问题描述

我想比较不同日期的两个不同时间的当前时间。我的代码是

I want to compare current time with two different times on different dates.MY code is

NSString *time1 = record.trigger_from_time;
NSString *time2 = record.trigger_to_time;

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"HH:mm:ss"];

NSDate *date1= [formatter dateFromString:time1];
NSDate *date2 = [formatter dateFromString:time2];

NSLog(@"%@,%@",date1,date2);

我的日志是2000-01-01 09:12:00 + 0000,2000- 01-01 12:30:00 +0000

I'm getting log as 2000-01-01 09:12:00 +0000,2000-01-01 12:30:00 +0000

但我现在的时间是2014-04-01 17:06:18。

But MY current time is 2014-04-01 17:06:18.

我从获得当前日期

I'm getting current date from

NSDate *now = [NSDate date]; 
NSDateFormatter *timeFormatter = [[NSDateFormatter alloc] init]; 
timeFormatter.dateFormat = @"HH:mm"; 
[timeFormatter setTimeZone:[NSTimeZone systemTimeZone]]; 
NSLog(@"The Current Time is %@",[timeFormatter stringFromDate:now]); 

我想将当前时间与record.trigger_from_time和record.trigger_to_time

I want to compare thie current time with record.trigger_from_time and record.trigger_to_time

推荐答案

比较2个NSDates。

Comparing 2 NSDates.

    ...
    NSDate *date1= [formatter dateFromString:time1];
    NSDate *date2 = [formatter dateFromString:time2];

    if ([date2 compare:date1] == NSOrderedDescending) {
        NSLog(@"date1 is later than date2");

    } else if ([date2 compare:date1] == NSOrderedAscending) {
        NSLog(@"date1 is earlier than date2");

    } else {
        NSLog(@"dates are the same");

    }

UPD：
via Switch

UPD: via Switch

       ...
        NSDate *date1= [formatter dateFromString:time1];
        NSDate *date2 = [formatter dateFromString:time2];

        NSComparisonResult result = [date2 compare:date1];
        switch(result){
            case NSOrderedDescending:
                NSLog(@"date1 is later than date2");
                break;
            case NSOrderedAscending:
                NSLog(@"date1 is earlier than date2");
                break;
            default:
                NSLog(@"dates are the same");
                break;
         }

这篇关于如何将两个给定时间与当前时间进行比较？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！