iOS-NSDate时间、时间戳操作

电玩女神 2023-10-16 23:53 40阅读 0赞

#pragma mark -获取字符串形式的时间戳
    -(NSString *)getTimeStampString
    {
        //获取时间和时间戳
        NSDate* timeStamp = [NSDatedateWithTimeIntervalSinceNow:0];
        NSTimeInterval temp=[timeStamptimeIntervalSince1970]*1000;
        return [NSStringstringWithFormat:@"%.0f", temp];
    }
    
    #pragma mark - 时间戳转为NSString
    /**
     *  @author zm
     *
     *  @brief  时间戳转为NSString
     *
     *  @param timeStamp   字符串格式的时间戳
     *  @param formatString format格式(默认yyyy-MM-dd HH:mm:ss.SSS)
     *
     *  @return 返回字符串
     */
    -(NSString *)event_stringFromTimeStamp:(NSString *)timeStamp formatString:(NSString *)formatString
    {
        NSDate *updatetimestamp = [selff_getDateByString:timeStamp];
        NSString *dateFormat =@"yyyy-MM-dd HH:mm:ss.SSS";
        if (formatString) {
            dateFormat = formatString;
        }
        NSDateFormatter *formatter = [[NSDateFormatteralloc]init];
        [formatter setDateStyle:NSDateFormatterMediumStyle];
        [formatter setTimeStyle:NSDateFormatterShortStyle];
        [formatter setDateFormat:dateFormat];
        NSString *dateString = [formatterstringFromDate:updatetimestamp];
        return dateString;
    }
    
    #pragma mark -获取字符串形式的当前时间(默认yyyy-MM-dd HH:mm:ss)
    +(NSString *)getDateTimeString:(NSDateFormatter *)dateFormatter
    {
        if (dateFormatter ==nil) {
            dateFormatter = [[NSDateFormatteralloc]init];
            [dateFormattersetDateFormat:@"yyyy-MM-dd HH:mm:ss.SSS"];
        }
        NSDate *dateNow = [NSDatedate];
        return [dateFormatterstringFromDate:dateNow];
    }
    
    #pragma mark -将字符串形式的时间转换为时间戳
    +(UInt64)getTimeStampByDateString:(NSString *)dateString
    {
        NSDateFormatter *XNNDateFormatter = [[NSDateFormatteralloc]init];
        [XNNDateFormattersetDateFormat:@"yyyy-MM-dd HH:mm:ss.SSS"];
        NSDate *XNNDate= [XNNDateFormatterdateFromString:dateString];
        if(XNNDate){
            return [XNNDatetimeIntervalSince1970]*1000;
        }else{
            return -99999;
        }
    }
    
    #pragma mark -字符串转为日期
    - (NSDate *)stringToDate:(NSString *)strdate
    {
        NSDateFormatter *dateFormatter = [[NSDateFormatteralloc] init];
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
        NSDate *retdate = [dateFormatter dateFromString:strdate];
        [dateFormatter release];
        return retdate;
    }
    
    #pragma mark -日期转为字符串
    - (NSString *)dateToString:(NSDate *)date
    {
        NSDateFormatter *dateFormatter = [[NSDateFormatteralloc] init];
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
        NSString *strDate = [dateFormatter stringFromDate:date];
        [dateFormatter release];
        return strDate;
    }
    
    #pragma mark -将UTC日期字符串转为本地时间字符串  
    //输入的UTC日期格式2013-08-03T04:53:51+0000  
    -(NSString *)getLocalDateFormateUTCDate:(NSString *)utcDate  
    {  
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];  
        //输入格式  
        [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ssZ"];  
        NSTimeZone *localTimeZone = [NSTimeZone localTimeZone];  
        [dateFormatter setTimeZone:localTimeZone];  
          
        NSDate *dateFormatted = [dateFormatter dateFromString:utcDate];  
        //输出格式  
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];  
        NSString *dateString = [dateFormatter stringFromDate:dateFormatted];  
        [dateFormatter release];  
        return dateString;  
    }
    
    #pragma mark -将本地日期字符串转为UTC日期字符串  
    //本地日期格式:2013-08-03 12:53:51  
    //可自行指定输入输出格式  
    -(NSString *)getUTCFormateLocalDate:(NSString *)localDate  
    {  
       NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 
        //输入格式  
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];        
        NSDate *dateFormatted = [dateFormatter dateFromString:localDate];  
        NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"UTC"];  
        [dateFormatter setTimeZone:timeZone]; 
       //输出格式 
        [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ssZ"];  
        NSString *dateString = [dateFormatter stringFromDate:dateFormatted]; 
        [dateFormatter release]; 
        return dateString;  
    } 
    
    - (NSString *)getUTCFormatDate:(NSDate *)localDate
    {
        NSDateFormatter *dateFormatter = [[NSDateFormatteralloc] init];
        NSTimeZone *timeZone = [NSTimeZonetimeZoneWithName:@"UTC"];
        [dateFormatter setTimeZone:timeZone];
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss Z"];
        NSString *dateString = [dateFormatter stringFromDate:localDate];
        [dateFormatter release];
        return dateString;
    }
    
    - (NSDate *)getLocalFromUTC:(NSString *)utc
    {
        NSDateFormatter *dateFormatter = [[NSDateFormatteralloc] init];
        NSTimeZone *timeZone = [NSTimeZonelocalTimeZone];
        [dateFormatter setTimeZone:timeZone];
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss Z"];
        NSDate *ldate = [dateFormatter dateFromString:utc];
        [dateFormatter release];
        return ldate;
    }
    
    #pragma mark -世界标准时间UTC /GMT 转为当前系统时区对应的时间 
    - (NSDate *)getNowDateFromatAnDate:(NSDate *)anyDate  
    {  
        //设置源日期时区  
        NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"UTC"];//或GMT  
        //设置转换后的目标日期时区  
        NSTimeZone* destinationTimeZone = [NSTimeZone localTimeZone];  
        //得到源日期与世界标准时间的偏移量  
        NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:anyDate];  
        //目标日期与本地时区的偏移量  
       NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:anyDate];  
        //得到时间偏移量的差值  
        NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;  
       //转为现在时间  
       NSDate* destinationDateNow = [[[NSDate alloc] initWithTimeInterval:interval sinceDate:anyDate] autorelease];  
        return destinationDateNow;  
    }  
        如：
         //2013-08-03T12:53:51+0800     UTC时间格式下的北京时间，可以看到北京时间＝ UTC + 8小时。
        NSDateFormatter *dateFormatter = [[NSDateFormatteralloc] init];
        [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ssZ"];
        NSDate *localDate = [dateFormatter dateFromString:@"2013-08-03T04:56:52+0000"];      ＋0000 表示的是当前时间是个世界时间。
        [dateFormatter release];
        NSLog(@"now Time = %@",[selfgetNowDateFromatAnDate:localDate]);
    结果：
    2013-08-03 12:57:33.391 xxxx[2547:c07] now Time = 2013-08-03 12:56:52 +0000
     以上注意一点，在转出来后带的时间是原参数anydate的时区，因此切不可再用NSDateFormatter 转换。否则会多增加一个时区的时间值。应该使用如下来提取字符串
        NSString *str = [NSStringstringWithFormat:@"%@",[selfgetNowDateFromatAnDate:localDate]];
        NSLog(@"str = %@",str);
    注NSDate对象存放的日期始终是UTC的标准时间，可以根据这个时间进行其它时间的转换。因此上面算出来的时间中时区为 +0000，如果此时再转为字符串
    #pragma mark -比较时间间隔（天数）
    +(NSInteger)compareOneDay:(NSDate *)oneDay withAnotherDay:(NSDate *)anotherDay
    {
        NSDateFormatter *dateFormatter=[[NSDateFormatteralloc]init];
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm"];
        NSTimeInterval time =[oneDaytimeIntervalSinceDate:anotherDay];
        NSInteger days=((NSInteger)time)/(3600*24);
        return days;
    }
    
    #pragma mark -比较时间间隔（ms）
    +(NSInteger)compareOneTime:(NSDate *)oneTime withAnotherTime:(NSDate *)anotherTime
    {
        NSDateFormatter *dateFormatter=[[NSDateFormatteralloc]init];
        [dateFormatter setDateFormat:@"HH:mm:ss"];
        NSTimeInterval time =[oneTimetimeIntervalSinceDate:anotherTime];
        //1s = 1000ms
        NSInteger timeT=((NSInteger)time) *1000;
        return timeT;
    }
    
    #pragma mark-获取当前时间的年、月、日、时、分、秒
    //获取当前时间
    NSDate *now = [NSDate date];
    NSLog(@"now date is: %@", now);
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
    NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:now]；
    int year = [dateComponent year];
    int month = [dateComponent month];
    int day = [dateComponent day];
    int hour = [dateComponent hour];
    int minute = [dateComponent minute];
    int second = [dateComponent second];
    NSLog(@"year is: %d", year);
    NSLog(@"month is: %d", month);
    NSLog(@"day is: %d", day);
    NSLog(@"hour is: %d", hour);
    NSLog(@"minute is: %d", minute);
    NSLog(@"second is: %d", second);