iOS 时间转换总结

刺骨的言语ヽ痛彻心扉 2022-12-13 11:23 447阅读 0赞

今天整理一下时间转换的类。  
1、获取当前时间字符串

/**
     *  当前时间字符串
     *
     *  @param format 时间格式 @"yyyy-MM-dd HH:mm:ss"
     *
     *  @return 时间字符串
     */
    + (NSString *)dateStringWithFormat:(NSString *)format{
        
        NSDate *now = [NSDate date];
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:format];
        //[dateFormatter setTimeZone:[NSTimeZone systemTimeZone]];
        NSString *dateString = [dateFormatter stringFromDate:now];
        return  dateString;
    }

2、用格式:时间获取正确时区的时间字符串

/**
    *  用格式:时间获取正确时区的时间字符串
    *
    *  @param format 时间格式 @"yyyy-MM-dd HH:mm:ss"
    *  @param date   时间
    *
    *  @return 时间字符串
    */
    + (NSString *)dateStringWithFormat:(NSString *)format date:(NSDate *)date{
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:format];
        //[dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:8]];
        //[dateFormatter setTimeZone:[NSTimeZone systemTimeZone]];
        NSString *dateString = [dateFormatter stringFromDate:date];
        
        return  dateString;
    }

3、时间字符串 获取格式的时间字符串

/**
    *  时间字符串 获取格式的时间字符串
    *
    *  @param format 时间格式
    *  @param date   时间
    *
    *  @return 时间字符串
    */
    + (NSString *)dateStringWithFormat:(NSString *)format dateString:(NSString *)date{
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        [formatter setLocale:[NSLocale currentLocale]];
        [formatter setDateFormat:format];
        NSDate *fDate = [formatter dateFromString:date];
        return [formatter stringFromDate:fDate];
    }

4、时间 距离现在的天数

/**
    *  时间 距离现在的天数
    *
    *  @param date 时间
    *
    *  @return 返回天数
    */
    + (int)daysFromDate:(NSDate *)date{
        NSCalendarUnit unit = NSCalendarUnitEra|NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay;
        NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
        //    NSDateComponents *start = [gregorian components:unit fromDate:[NSDate date]];
        //    NSDateComponents *end = [gregorian components:unit fromDate:date];
        
        return (int)[[gregorian components:unit fromDate:date toDate:[NSDate date] options:0] day];
    }

5、获取距离当前的时间 聊天时间

/**
    *  获取距离当前的时间 聊天时间
    *
    *  @param date 日期
    *
    *  @return 日期-昨天-前天-2015-01-01
    */
    + (NSString *)dateStringForChat:(NSDate *)date{
        int days = [self daysFromDate:date];
        NSString *dateString;
        if (days == 0) {
            dateString = [self dateStringWithFormat:@"HH:mm" date:date];
        }else if (days == 1) {
            dateString = [NSString stringWithFormat:@"昨天 %@",[self dateStringWithFormat:@"HH:mm" date:date]];
        }else if (days == 2) {
            dateString = [NSString stringWithFormat:@"前天 %@",[self dateStringWithFormat:@"HH:mm" date:date]];
        }else {
            dateString = [self dateStringWithFormat:@"yyyy-MM-dd HH:mm" date:date];
        }
        return dateString;
    }

6、NSNumber转换成时间字符串

/**
    *  NSNumber转换成时间字符串
    *
    *  @param format    日期格式
    *  @param number 时间NSNumber
    *
    *  @return 时间字符串
    */
    + (NSString *)dateStringWithFormat:(NSString *)format number:(NSNumber *)number{
        NSString*str=nil;//时间戳
        if (![number isKindOfClass:[NSNumber class]]) {
            str=(NSString*)number;//时间戳
        }else{
           str=[number stringValue];//时间戳
        }
        NSTimeInterval time =[str doubleValue]+28800;//因为时差问题要加8小时 == 28800 sec
        NSDate*detaildate=[NSDate dateWithTimeIntervalSince1970:time/1000];
        //实例化一个NSDateFormatter对象
        NSDateFormatter*dateFormatter = [[NSDateFormatter alloc]init];
        //设定时间格式,这里可以设置成自己需要的格式
        [dateFormatter setDateFormat:format];
        NSString*currentDateStr = [dateFormatter stringFromDate:detaildate];
        return currentDateStr;
    }

7、时间字符串转换成时间字符串

/**
    *  时间字符串转换成时间字符串
    *
    *  @param format    日期格式
    *  @param string 时间字符串
    *
    *  @return 时间字符串
    */
    + (NSString *)dateStringWithStringFormat:(NSString *)format dateString:(NSString *)string{
    
        id result;
        NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
        result=[formatter numberFromString:string];
        if(result)
        {
            double timesTamp = [string doubleValue];
            NSDate *date = [NSDate dateWithTimeIntervalSince1970:timesTamp/1000];
            NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
            [dateFormatter setDateFormat:format];
            //[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
            
            //[dateFormatter setTimeStyle:NSDateFormatterShortStyle];
            [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:8]];
            NSString*confromTimespStr = [dateFormatter stringFromDate:date];
            
            return confromTimespStr;
            
        }
        return nil;
    }

8、获取某年某月的天数

/**
    *  获取某年某月的天数
    *
    *  @param year    年
    *  @param month 月
    *
    *  @return 多少天
    */
    + (NSInteger)howManyDaysInThisYear:(NSInteger)year withMonth:(NSInteger)month{
        if((month == 1) || (month == 3) || (month == 5) || (month == 7) || (month == 8) || (month == 10) || (month == 12))
            return 31 ;
        
        if((month == 4) || (month == 6) || (month == 9) || (month == 11))
            return 30;
        
        if((year % 4 == 1) || (year % 4 == 2) || (year % 4 == 3))
        {
            return 28;
        }
        
        if(year % 400 == 0)
            return 29;
        
        if(year % 100 == 0)
            return 28;
        
        return 29;
    }

9、在当前日期时间加上 某个时间段(传负数即返回当前时间之前x月x日的时间)

/**
     *  ** 在当前日期时间加上 某个时间段(传负数即返回当前时间之前x月x日的时间)
     *
     *  @param year   当前时间若干年后 （传负数为当前时间若干年前）
     *  @param month  当前时间若干月后  （传0即与当前时间一样）
     *  @param day    当前时间若干天后
     *  @param hour   当前时间若干小时后
     *  @param minute 当前时间若干分钟后
     *  @param second 当前时间若干秒后
     *
     *  @return 处理后的时间字符串
     */
    + (NSString *)dateStringAfterlocalDateForYear:(NSInteger)year Month:(NSInteger)month Day:(NSInteger)day Hour:(NSInteger)hour Minute:(NSInteger)minute Second:(NSInteger)second
    {
        // 当前日期
        NSDate *localDate = [NSDate date]; // 为伦敦时间
        // 在当前日期时间加上 时间：格里高利历
        NSCalendar *gregorian = [[NSCalendar alloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
        NSDateComponents *offsetComponent = [[NSDateComponents alloc]init];
        
        [offsetComponent setYear:year ];  // 设置开始时间为当前时间的前x年
        [offsetComponent setMonth:month];
        [offsetComponent setDay:day];
        [offsetComponent setHour:(hour+8)]; // 中国时区为正八区，未处理为本地，所以+8
        [offsetComponent setMinute:minute];
        [offsetComponent setSecond:second];
        // 当前时间后若干时间
        NSDate *minDate = [gregorian dateByAddingComponents:offsetComponent toDate:localDate options:0];
        
        NSString *dateString = [NSString stringWithFormat:@"%@",minDate];
        
        return dateString;
    }

10、日期格式转换

/************
     日期格式请传入：2013-08-05 12:12:12；如果修改日期格式，比如：2013-08-05，则将[df setDateFormat:@"yyyy-MM-dd HH:mm:ss"];修改为[df setDateFormat:@"yyyy-MM-dd"];
     ***********/
    +(int)compareDate:(NSString*)date01 withDate:(NSString*)date02{
        int ci;
        NSDateFormatter *df = [[NSDateFormatter alloc]init];
        [df setDateFormat:@"yyyy-MM-dd"];
        NSDate *dt1;
        NSDate *dt2;
        dt1 = [df dateFromString:date01];
        dt2 = [df dateFromString:date02];
        NSComparisonResult result = [dt1 compare:dt2];
        switch (result){
                //date02比date01大
            case NSOrderedAscending: ci=1;break;
                //date02比date01小
            case NSOrderedDescending: ci=-1;break;
                //date02=date01
            case NSOrderedSame: ci=0;break;
            default: NSLog(@"erorr dates %@, %@", dt2, dt1);break;
        }
        return ci;
    }

11、时间格式转换

/**
    时间格式转换
    @param targetFormat 目标字符串格式
    @param changeFormat 改变字符串格式
     @param valueStr 需要改变的字符串
    @return 返回字符串
    */
    +(NSString *)endStringFormatTargetFormat:(NSString *)targetFormat changeFormatStrFormat:(NSString *)changeFormat andValueStr:(NSString *)valueStr{
        
        NSDateFormatter* dateFormat = [[NSDateFormatter alloc] init];
        [dateFormat setDateFormat:targetFormat];
        NSDate *date =[dateFormat dateFromString:valueStr];
        
        NSDateFormatter* dateFormat2 = [[NSDateFormatter alloc] init];
        
        [dateFormat2 setDateFormat:changeFormat];
        
        NSString *publishtimeStr = [dateFormat2 stringFromDate:date];
        
        return publishtimeStr;
    }

12、判断是否在工作时间内

/**
     判断是否在工作时间内
     @param fromdate 开始时间
     @param toDate 结束时间
     @return 判断结果
     */
    +(BOOL)inWorkPeriodFromDate:(NSString *)fromdate toDate:(NSString *)toDate {
        NSString *dateStr = [self obtainCurrentTimeWithFormatter:@"yyyy-MM-dd HH:mm:ss"];
        NSString *from = [NSString stringWithFormat:@"%@ %@",dateStr,fromdate];
        NSString *to = [NSString stringWithFormat:@"%@ %@",dateStr,toDate];
        NSTimeInterval fromTime = [[self transfromDateFromString:from inFormatter:@"yyyy-MM-dd HH:mm:ss"] timeIntervalSince1970];
        NSTimeInterval toTime = [[self transfromDateFromString:to inFormatter:@"yyyy-MM-dd HH:mm:ss"] timeIntervalSince1970];
        NSTimeInterval currentTime = [[NSDate date] timeIntervalSince1970];
        if (currentTime >fromTime && currentTime < toTime) {
            return YES;
            NSLog(@"是当前时间区内");
        }else {
            return NO;
        }
    }

13、获取当月第一天

//获取当月第一天 dateStr 传 @"yyyy-MM-dd"
    + (NSString *)getMonthFirstAndLastDayWith:(NSString *)dateStr{
        NSDateFormatter *format=[[NSDateFormatter alloc] init];
        [format setDateFormat:@"yyyy-MM-dd"];
        NSDate *newDate=[format dateFromString:dateStr];
        double interval = 0;
        NSDate *firstDate = nil;
        NSDate *lastDate = nil;
        NSCalendar *calendar = [NSCalendar currentCalendar];
        
        BOOL OK = [calendar rangeOfUnit:NSCalendarUnitMonth startDate:& firstDate interval:&interval forDate:newDate];
        
        if (OK) {
            lastDate = [firstDate dateByAddingTimeInterval:interval - 1];
        }else {
            return @"";
        }
        NSDateFormatter *myDateFormatter = [[NSDateFormatter alloc] init];
        [myDateFormatter setDateFormat:@"yyyy-MM-dd"];
        NSString *firstString = [myDateFormatter stringFromDate: firstDate];
        //获取当月的最后一天
        //    NSString *lastString = [myDateFormatter stringFromDate: lastDate];
        return firstString;
        //    return @[firstString, lastString];
    }

END.