时间的转换

time ==  1435199910000；

NSDate *date = [NSDatedateWithTimeIntervalSince1970:(time/1000)]；

 

+(NSString *)stringEvaluateDateWithLongLong:(long long)time

{

    //对dateFormatter的自定义

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

    //对时间格式的设置，可以自由设置格式

    [dateFormatter setDateFormat:@"YYYY-MM-dd”]

    //例如

    [dateFormatter setDateFormat:@“YYYY/MM/dd”]

    //对毫秒数的转换，转换为 2015-06-11 09:53:10 +0000

    NSDate *date = [NSDate dateWithTimeIntervalSince1970:time/1000];

    //对date的转换，转换为 2015-06-11 09:53:10

    NSString *dateSMS = [dateFormatter stringFromDate:date];

   //获取当前时间值

    NSDate *now = [NSDate date];

   //将当前时间值转换为格式设置的形式

    NSString *dateNow = [dateFormatter stringFromDate:now];

   //系统默认的时间形式的显示 2015-06-11 09:53:10

     NSString *today = [[now description] substringToIndex:10];

//    NSLog(@"third === %@%@%@", dateNow, today,dateSMS);

    //一天时间的time值

    NSTimeInterval second = 24 *60 *60;

   //转换为昨天的时间以及字符串

    NSDate *yesterday = [now dateByAddingTimeInterval: -second];

    NSString *yesterdayString = [[yesterday description] substringToIndex:10];

 

    NSDate *third = [now dateByAddingTimeInterval:-second*2];
    NSString *thirdString = [[third description] substringToIndex:10];
   
    if ([dateSMS isEqualToString:dateNow]) {
        [dateFormatter setDateFormat:[NSString stringWithFormat:@"今天%@",@"HH:mm"]];
    }else if ([dateSMS isEqualToString:yesterdayString])
    {
        [dateFormatter setDateFormat:[NSString stringWithFormat:@"昨天%@",@"HH:mm"]];
    }else if ([dateSMS isEqualToString:thirdString])
    {
        [dateFormatter setDateFormat:[NSString stringWithFormat:@"前天%@",@"HH:mm"]];
    }
    else {
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm"];

    }

    //将date转为字符串

    dateSMS = [dateFormatter stringFromDate:date];
    return dateSMS;

}

 

 

 

 

 

 

 

 

将时间转为时间戳

 

NSString* dateStr = begin;

       

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

       

[formater setDateFormat:@"yyyy年MM月dd日  HH:mm:ss"];

       

self.startNum = [formater dateFromString:dateStr];

 

-(long long)getDateTimeTOMilliSeconds:(NSDate *)datetime

{
    NSTimeInterval interval = [datetime timeIntervalSince1970];
    NSLog(@"interval=%f",interval);
    long long totalMilliseconds = interval*1000 ;
    NSLog(@"totalMilliseconds=%llu",totalMilliseconds);
    return totalMilliseconds;

}