Need to add date/time stamp to file name without time change creating new files

Question

We have setup our application to save data once a trigger event occurs. We also need the date/time stamp as part of the file name. We used Format Date/Time String and concatenated it into the file name. It all works good, but as the time changes (seconds, minutes, etc.) it causes the Write to File to create a new file with the new filename. Is there a way to create the file and save/latch/buffer the time in the file name so that it doesn't create a new file for every second?
I've attached a shot of the relevant part of our VI. It's all in a big while loop. The data save is in a case/switch so that when it is triggered it starts saving. (The for loop is to split the data up
into 4 different files). Like I said, it all works except new files are created every second as the time changes instead of just putting it all in one file with the initial time in the file name.
Attachments:
TimeInFileNameQuestion.jpg ‏46 KB

Answer 1

I need a loop in order to use a shift register. I cannot stop the outer while loop (because it would stop the hardware from collecting data), and I cannot add loops inside which bogs down the processor to where the app stops. I've attached a simpler version of my VI which illustrates the problem. While the button is pressed (the trigger) it should save the data (in this case just cycle numbers) into one file with the initial date/time. But, you can see that it creates 1 file/second. I tried using shift registers, but without adding extra loops I can't see how to do it. Thanks
Attachments:
FileNameTest.vi ‏29 KB