Time stamp to name a TDMS file

Hi:

I am using data from excel files to create a time stamp, after that,my VI creates TDMS files with this data in files with 5000 samples, also I am using time stamp to named the TDMS files, but my problem is that my first file takes the name 180000.000, How can I modify this? because I need my file´s name will be the first data from excel.

I attached my VI and two excel files, the idea is that the first file will be 84327.500 and the second will be 84740.950