Time stamp when a row is complete but updates everytime something is input to other cells

Hello,
So I am trying to create a timestamp code that will fill in the exact time an entire row is completed. So far the code I have come up with works for the 1st row but then any subsequent rows update all the timestamps.
Here is an example of my formula:

=IF(AND(NOT(ISBLANK($D$14)), NOT(ISBLANK($F$14)), NOT(ISBLANK($G$14)), NOT(ISBLANK($H$14)), NOT(ISBLANK($J$14)), NOT(ISBLANK($K$14))), NOW(), "")

Formulas change for each row, for example: for B15 all would be 15, B16 all would be 16 etc.

Time stamps should be in cells B14 through B23 and each should represent the time each of these rows (14-23) are completed but not update all timestamps.

excel scan 1st row.pngexcel scan 2-3rd rows.png