My first timespan is: "00:01:03,160"
and my second timespan is: "00:00:01,100"
i want to do an addition or subtraction between 00:01:03,160 to 00:00:01,100
00:01:03,160 + 00:00:01,100 = 00:01:04,260
i think that the format is : hh\:mm\:ss\,fff