从NSDate获取时间返回nil [英] Get time from NSDate returns nil

问题描述

我正在尝试在图表上显示时间，并且以这种@"2012-08-28 18:50:24"格式显示了完整的时间戳.当我尝试从该日期开始获取时间时，它在NSDate中返回nil.

I am trying to show time on graph and i have a full time stamp in this @"2012-08-28 18:50:24" format. when i try to get time from this date then it returns nil in NSDate.

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"HH:mm:ss"];
    NSDate *time = [formatter dateFromString:@"2012-08-28 18:50:24"];

仅当我将 [formatter setDateFormat:@"HH:mm:ss"]; 行更改为 [formatter setDateFormat:@"yyyy-MM-dd HH:mm]时，此代码中的

:ss]; ，然后开始使用完整的日期和时间.但是我只需要时间

in this code only if I change [formatter setDateFormat:@"HH:mm:ss"]; line to [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; then it starts working with full date and time. But i need only time

推荐答案

首先，您已将字符串日期和时间转换为日期格式.

First you have converted your string date and time in the date formate..

YourTimeStr = @"2012-08-28 18:50:24";  

  NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    formatter.dateFormat = @"yyyy-mm-dd HH:mm:ss";
    NSDate *DateAndTime = [formatter dateFromString:LogOutTimeSTR];

然后

NSDateFormatter *dateFormatter1 = [[[NSDateFormatter alloc] init] autorelease];
    [dateFormatter1 setDateFormat:@"HH:mm:ss"];
    [dateFormatter1 setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]];

    NSString *YourTimeStr =[dateFormatter1 stringFromDate:DateAndTime];

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