Calculate time difference on subform

[kknm]

Understood! All OK !
The problem is in the line:

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if (a.val() == 1) {//was if (a == '1') 

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 updateDuration(t1, t2, d, a, e);

[kev1n]

Meaningful variable names help to make code more readable and easier to understand.

E.g. like this:

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var beg = $("#" + prefix + "pro_beg");
var end = $("#" + prefix + "pro_end");
var diff1  = $("#" + prefix + "pro_dif");
var diff2  = $("#" + prefix + "pro_diff");
var devNum  = $("#" + prefix + "pro_num");

[kknm]

Meaningful variable names help to make code more readable and easier to understand.

Early rejoiced, Counts only the first line. - fixed.
I need to display the sum of the differences for each device