iOS 时间格式转化总结（七种）

#pragma mark - 将某个时间转化成 时间戳+(NSInteger)timeSwitchTimestamp:(NSString *)formatTime andFormatter:(NSString *)format{    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];        [formatter setDateStyle:NSDateFormatterMediumStyle];        [formatter setTimeStyle:NSDateFormatterShortStyle];        [formatter setDateFormat:format]; //(@"YYYY-MM-dd hh:mm:ss") ----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制    NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];        [formatter setTimeZone:timeZone];    NSDate* date = [formatter dateFromString:formatTime]; //------------将字符串按formatter转成nsdate    //时间转时间戳的方法:    NSInteger timeSp = [[NSNumber numberWithDouble:[date timeIntervalSince1970]] integerValue];    NSLog(@"将某个时间转化成 时间戳&&&&&&&timeSp:%ld",(long)timeSp); //时间戳的值    return timeSp;    }//时间戳转成时间//字符串转为时间，时间格式自己定+(NSString *)timestampSwitchTime:(NSString *)time{//     NSString * time = @"594947489";//时间字符串    NSInteger num = [time integerValue];//转为int型    NSDateFormatter * formatter = [[NSDateFormatter alloc] init];//时间管理    [formatter setDateStyle:NSDateFormatterMediumStyle];//时间方式    [formatter setTimeStyle:NSDateFormatterShortStyle];    [formatter setDateFormat:@"YYYY-MM-dd"];    NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];    [formatter setTimeZone:timeZone];    NSDate * confromTime = [NSDate dateWithTimeIntervalSince1970:num];    NSString * comfromTimeStr = [formatter stringFromDate:confromTime];    NSLog(@"%@",comfromTimeStr);    return comfromTimeStr;}//GMT只需要将代码中的UTC替换为GMT即可//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];    return dateString;}//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];    return dateString;}//将GMT日期字符串转为本地时间字符串//输入的GMT日期格式Tue May 31 17:46:55 +0800 2011+ (NSString *)getLocalDateFormateGMTDate:(NSString *)gmtDate{    // 时间字符串//    NSString *string = @"Tue May 31 17:46:55 +0800 2011";    // 日期格式化类    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];    dateFormatter.dateFormat = @"EEE MMM dd HH:mm:ss Z yyyy";    //fmt.dateFormat = @"EEE MMM dd HH:mm:ss ZZZZ yyyy";    // 设置语言区域    NSTimeZone *localTimeZone = [NSTimeZone localTimeZone]; [dateFormatter setTimeZone:localTimeZone];    NSDate *dateFormatted = [dateFormatter dateFromString:gmtDate];        //输出格式    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];    NSString *dateString = [dateFormatter stringFromDate:dateFormatted];    return dateString;}//方式二 后台给的格式为 纯数字1352170595000(13位)+(NSString *)updateTimeForRow:(NSString *)str {    // 获取当前时时间戳 1466386762.345715 十位整数 6位小数    NSTimeInterval currentTime = [[NSDate date] timeIntervalSince1970];    // 创建歌曲时间戳(后台返回的时间 一般是13位数字)    NSTimeInterval createTime =[str floatValue]/1000;    // 时间差    NSTimeInterval time = currentTime - createTime;        //秒转分钟    NSInteger small = time / 60;    if (small == 0) {        return [NSString stringWithFormat:@"刚刚"];    }        if (small < 60) {        return [NSString stringWithFormat:@"%ld分钟前",small];    }        // 秒转小时    NSInteger hours = time/3600;    if (hours<24) {        return [NSString stringWithFormat:@"%ld小时前",hours];    }    //秒转天数    NSInteger days = time/3600/24;    if (days < 30) {        return [NSString stringWithFormat:@"%ld天前",days];    }    //秒转月    NSInteger months = time/3600/24/30;    if (months < 12) {        return [NSString stringWithFormat:@"%ld月前",months];    }    //秒转年    NSInteger years = time/3600/24/30/12;    return [NSString stringWithFormat:@"%ld年前",years];}//方式一 后台给的格式为yyyy-MM-dd HH:mm:ss.SSS+(NSString *) compareCurrentTime:(NSString *)str{    //把字符串转为NSdate    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];    NSDate *timeDate = [dateFormatter dateFromString:str];    NSDate *currentDate = [NSDate date];        //得到两个时间差    NSTimeInterval timeInterval = [currentDate timeIntervalSinceDate:timeDate];    long temp = 0;    NSString *result;    if (timeInterval/60 < 1)    {        result = [NSString stringWithFormat:@"刚刚"];    }    else if((temp = timeInterval/60) <60){        result = [NSString stringWithFormat:@"%ld分钟前",temp];    }    else if((temp = temp/60) <24){        result = [NSString stringWithFormat:@"%ld小时前",temp];    }    else if((temp = temp/24) <30){        result = [NSString stringWithFormat:@"%ld天前",temp];    }    else if((temp = temp/30) <12){        result = [NSString stringWithFormat:@"%ld月前",temp];    } else{        temp = temp/12;        result = [NSString stringWithFormat:@"%ld年前",temp];    }    return  result;}