是指UIDataPicker时间

首先，传进来的时间String是按24小时格式，然后将这个时间转换成NSDate:

    NSString* formatstring = nil;
    if([NSLocale timeIs24HourFormat])
        formatstring =  @"yyyy-MM-dd hh:mm:ss";
    else 
        formatstring = @"yyyy-MM-dd HH:mm:ss";
    
    NSDate* date = [NSString stringToDate:datestring andDateFormat:formatstring setUTC:NO]; 

 

stringToDate: andDateFormat:setUTC函数实现：

+(NSDate*)stringToDate:(NSString*)dateStr andDateFormat:(NSString*)dateFormatString setUTC:(BOOL)b
{
    NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];    
    if(b)
    	[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];  
    
    [dateFormatter  setDateFormat:dateFormatString];//@"yyyy-MM-dd HH:mm:ss"];    
    
    
    NSDate* dateFromString = [dateFormatter dateFromString:dateStr];    
    
    return dateFromString; 
}

 

最后，将这个dateFromString设置到UIDatePicker的date属性。