How can I retain lefthand zeros as placeholders in LV?

I want to add two numbers, but need to retain zeros on the left for place holders. for example:
0000000123
0000060000
0000060123
The arithimetic 'add' function drops the lefthand zeros and I can't figure out a way to add two strings.
Note - I tried adding an additional lefthand '1' just as a place holder, like this:
10000000123
10000060000
20000060123
then converting the number into a string and truncating the extra '2', but for some reason I can't seem to add numbers this large. Any suggestions?

Dennis, I'm actually using the large number as a time code. I'm trying to build a generic timer where the user can enter in a length of run-time. Months, days, hours, minutes, seconds. I'm trying to use a number that the user generates by entering in the length of run time (for instance: 4 months, 7 days, 8 hours, 30 minutes looks like: 04070830) and adding that number to the system time formatted in the same way. (--- this is where I was having the problem with adding numbers with lefthand zeros)
I'm trying to use this method so that the vi will be generic and totally independant of the point in time when the vi is called. Attached is my code so far if you're at all interested (keep in mind this is a work in progress and I am a complete newby at programming).
This started as a very simple sub-vi until I decided to make it as generic as possible. The difficult thing is trying to match the system clock. What if someone sets the run-time to run 9 hours overnight? After 23:59 hours the clock resets to 0100 and the day increments by one. Same problem if the vi happens to be running on the last day of the month or the last day of the year.
Oh well - once I get it debugged it should be truly generic and I can use it in any number of different applications.
- Paul
Attachments:
set time to trigger-mod 8-16-05.vi ‏146 KB

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