字符串 时间格式之间互转

//将时间转字符串

-(NSString *)nowString

{
    NSDateFormatter *formatter = [[NSDateFormatteralloc]init];
    [formatter setDateFormat:@"M-d hh-mm-ss"];
    return [formatterstringFromDate:[NSDatedate]];
}
-(NSString *)transTimeStr{

//将字符串转为日期

   NSDateFormatter *dateFormat1 = [[NSDateFormatteralloc]init];
    [dateFormat1 setTimeZone:[NSTimeZonetimeZoneWithAbbreviation:@"zyc"]];
    //先设置给定的字符串是什么格式的例如yyyyMMddHHmmss
    [dateFormat1 setLocale:[NSLocalecurrentLocale]];
    [dateFormat1 setDateFormat:@"yyyyMMddHHmmss"];
    [dateFormat1 setFormatterBehavior:NSDateFormatterBehaviorDefault];
   
    NSDate *date1 = [dateFormat1dateFromString:@"20000101111111"];
   
    //将日期转为指定格式
    NSDateFormatter *dateFormat2 = [[NSDateFormatteralloc]init];
    [dateFormat2 setTimeZone:[NSTimeZonetimeZoneWithAbbreviation:@"zyc"]];
    [dateFormat2 setLocale:[NSLocalecurrentLocale]];
    //将NSDate格式时间转成什么格式的字符串例如转成M-d
    [dateFormat2 setDateFormat:@"yyyy-MM-dd HH/mm/ss"];
    [dateFormat2 setFormatterBehavior:NSDateFormatterBehaviorDefault];
   
    NSString *timeStr = [dateFormat2stringFromDate:date1];
    return  timeStr;
   

}