By: Sabrina Ayon

In reply to austin.

Hello, AUSTIN!
Thanks for sharing your problem with us!

To convert values into timestamps, follow the instructions below.
1. select the cell and put the formula into that cell.
2. Press Enter.
=(INT(B3/10000)&":"&INT(MOD(B3,10000)/100)&":"&MOD(B3,100))+0

3. This will convert the values into time values.
4. Now, go to Home tab by selecting the resulted cell and click on Number Format drop-down menu under Number group.

5. Drag the Fill Handle icon down to duplicate the formula over the range. Or, to AutoFill the range, double-click on the plus (+) symbol.

6. And, that’s it! But there is an issue. as 13 represent 1 in time, so 13 will replaced by 1.

Hope this will help you!
If not, can you please send me your excel file via email? (sabrinaayon.cse786@gmail.com).

Good Luck!
Best Regards
Sabrina Ayon
Author, ExcelDemy.