public static string GetStrHhMm(this UTimer t)
{
UTimer.TimeStruct ts = t.TickToTimeStruct(t.Tick);
int h = ts.Hour;
int m = ts.Minute;
s_strBuff.Length = 0;
s_strBuff.Append((char)('0' + (h / 10)));
s_strBuff.Append((char)('0' + (h % 10)));
s_strBuff.Append(':');
s_strBuff.Append((char)('0' + (m / 10)));
s_strBuff.Append((char)('0' + (m % 10)));
return(s_strBuff.ToString());
}