First, the tool:
use Excel2013
Second, the steps:
may have millisecond time subtraction or statistical difference of two pieces of data is calculated by adding the sum of the data, as follows:
1, time subtraction statistical difference between two points of time
(1) First, the need to ensure the number of one-time addition and subtraction
(2) to select a range of cells with an input time milliseconds, right click and select "Format cells", conventional or select values as:
(3) enter the formula = ( A1-Bl) 24 60 60 *
(. 4), or double-clicking the pull-down time automatically calculate the remaining difference 
2, the addition time, the statistical sum of two time points
(1) first, to ensure the required number of one-time addition and subtraction
(2) to select a range of cells with input time milliseconds, right click and select "format cells", select custom format, select the type of time as:
(3) input G2 + H2 of the formula =
(. 4), or double-clicking the pull-down automatically calculate the sum of the remaining time
statistical difference than the recommended amount of time, of course, more efficient statistical methods, welcome to share learning together
