iOS_NSDate,时间戳等

来源：互联网发布：一个域名要多少钱编辑：程序博客网时间：2024/06/07 02:36

会出现2038问题。

addtime = 1410863909000;

要转换成iOS的时间戳要除以1000

        NSString*String = [NSStringstringWithFormat:@"%f",1410863909000/1000];       NSTimeInterval time = [StringdoubleValue];        NSDateFormatter * formatter = [[NSDateFormatteralloc]init];        [formatter setDateStyle:NSDateFormatterMediumStyle];        [formatter setTimeStyle:NSDateFormatterShortStyle];        [formattersetDateFormat:@"yyyy-MM-dd HH:mm"];//yyyy-MM-dd HH:mmset        [formatter setFormatterBehavior:NSDateFormatterBehavior10_4];        NSDate *timeDate = [NSDatedateWithTimeIntervalSince1970:time];       NSLog(@"pcl.addtime  = %@",timeDate);       NSString *timeStr = [formatterstringFromDate:timeDate];       NSLog(@"timeStr=%@",timeStr);

测试程序的效率：

/* 计算一个方法的效率  TICK在方法前调用 Tock在方法后调用*/#define TICK   NSDate *startTime = [NSDate date]#define TOCK   NSLog(@"Time: %f", -[startTime timeIntervalSinceNow])

获取当前时间

-(NSString*)getTodayDate{    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];    NSDateComponents *comps = [[NSDateComponents alloc] init];    NSInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit |    NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;    NSDate *now=[NSDate date];    comps = [calendar components:unitFlags fromDate:now];    //week = [comps weekday];    NSInteger year = [comps year];    NSInteger month = [comps month];    NSInteger day = [comps day];    NSString * dateStr = [NSString stringWithFormat:@"%04d%02d%02d",year,month,day];    return dateStr;}

计算周几：

// 计算出对应的一个星期的第几天- (NSInteger) getWeekDayWithStringDate:(NSString *) strdate  {    int year = [[strdate substringToIndex:4] intValue];    int month = [[[strdate substringFromIndex:4] substringToIndex:2] intValue];    int day = [[strdate substringFromIndex:6] intValue];    NSDateComponents *comps = [[[NSDateComponents alloc] init] autorelease];    [comps setDay:day];    [comps setMonth:month];    [comps setYear:year];    NSCalendar *gregorian = [[[NSCalendar alloc]                              initWithCalendarIdentifier:NSGregorianCalendar] autorelease];    NSDate *date = [gregorian dateFromComponents:comps];    NSDateComponents *weekdayComponents =    [gregorian components:NSWeekdayCalendarUnit fromDate:date];    NSInteger weekday = [weekdayComponents weekday];    return weekday;}// 对应于哪一天- (NSString *) getWeekDayWithIntWeekday:(NSInteger) intweekday  {    switch (intweekday) {        case 1:            return LocalizedString(@"周日", @"");            break;        case 2:            return LocalizedString(@"周一", @"");            break;        case 3:            return LocalizedString(@"周二", @"");            break;        case 4:            return LocalizedString(@"周三", @"");            break;        case 5:            return LocalizedString(@"周四", @"");            break;        case 6:            return LocalizedString(@"周五", @"");            break;        case 7:            return LocalizedString(@"周六", @"");            break;        default:            return nil;            break;    }}

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