13位时间戳转时间 获取当前时间

1 ，13位时间戳转时间  stamp =  1513478681000

- (NSString *)timeStampConvertToDateWithStamp:(double )stamp {

    // 把时间戳转化成时间

    NSTimeInterval interval = stamp / 1000.0;

    NSDate *date = [NSDate dateWithTimeIntervalSince1970:interval];

    NSDateFormatter *objDateformat = [[NSDateFormatter alloc] init];

    [objDateformat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

    NSString * timeStr = [NSString stringWithFormat:@"%@",[objDateformat stringFromDate: date]];

    return timeStr;

}

2 ， 获取当前时间

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

    [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];

    NSDate *datenow = [NSDate date];

    NSString *currentTimeString = [formatter stringFromDate:datenow];

    NSLog(@"currentTimeString =  %@",currentTimeString);

3， 获取两个时间之间的差

- (NSInteger )countTwoDatesAreCalculatedWithStart:(NSString * )start End:(NSString *)end {

    //创建日期格式化对象

    NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];

    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

    

    NSDate *date1 = [dateFormatter dateFromString:start]; //start

    NSDate *date2 = [dateFormatter dateFromString:end]; //end

    //取两个日期对象的时间间隔：

    //这里的NSTimeInterval 并不是对象，是基本型，其实是double类型，是由c定义的:typedef double NSTimeInterval;

    NSTimeInterval time=[date2 timeIntervalSinceDate:date1];

    

    int days= ((int)time)/(3600*24);

    int hours=((int)time)%(3600*24)/3600;

    //NSString *dateContent=[[NSString alloc] initWithFormat:@"%i天%i小时",days,hours];

    return days;

}

4 ， 获取当前时间的时间戳

    NSDate* localDate = [NSDate date];

    NSTimeInterval interval=[localDate timeIntervalSince1970];

    NSString *timestamp = [NSString stringWithFormat:@"%ld", (long)interval];