计算用户的在线时间

　　今天要计算用户在线的时间, 时间的格式:　　2014-07-09 15:27:38

　　写了一个静态方法, 输入两个时间,可以得到两个时间差.

　　

static class time
    {
        static string reg_d="(?<=(\-))\d+";
        static string reg_h="\d+(?=\:)";
        static int[] monthdays_p={0,0,131,59,90,120,151,181,212,243,273,304,334};
        //static int monthdays_r[]={0,0,131,59,90,120,151,181,212,243,273,304,334};
       public  static int cha(string a,string b)
        {
            int am=0,ad=0,ah=0,af=0;
            int bm=0,bd=0,bh=0,bf=0;
            int i=0;
            foreach(Match m in Regex.Matches(a,reg_d))
            {
                if(i++==0)
                    am=int.Parse(m.ToString());
                ad=int.Parse(m.ToString());
            }
            i=0;
            foreach(Match m in Regex.Matches(b,reg_d))
            {
                if(i++==0)
                    bm=int.Parse(m.ToString());
                bd=int.Parse(m.ToString());
            }
            i=0;
            foreach(Match m in Regex.Matches(a,reg_h))
            {
                if(i++==0)
                    ah=int.Parse(m.ToString());
                af=int.Parse(m.ToString());
            }
            i=0;
            foreach(Match m in Regex.Matches(b,reg_h))
            {
                if(i++==0)
                    bh=int.Parse(m.ToString());
                bf=int.Parse(m.ToString());
            }

            int chazhi=0;

            chazhi=bf-af+(bh-ah)*60+(bd-ad+monthdays_p[bm]-monthdays_p[am])*1440;
            return chazhi;
        }
    }