iOS --- 将某个时间转化成时间戳/时间戳转换为时间

1. 时间转化成时间戳

    _timeStamp = [NSString stringWithFormat:@"%ld",[self timeSwitchTimestamp:_rightStr7 andFormatter:@"YYYY年MM月dd日"]];(@"YYYY年MM月dd日"可根据你设置的格式设置)

-(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;
}

2. 时间戳转换为时间

NSString*str=@"1368082020";//时间戳

NSTimeIntervaltime=[strdoubleValue]+28800;//因为时差问题要加8小时 == 28800 sec

NSDate*detaildate=[NSDatedateWithTimeIntervalSince1970:time];

NSLog(@"date:%@",[detaildatedescription]);

//实例化一个NSDateFormatter对象

NSDateFormatter*dateFormatter = [[NSDateFormatteralloc]init];

//设定时间格式,这里可以设置成自己需要的格式

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

NSString*currentDateStr = [dateFormatterstringFromDate:detaildate];