So after many hours scouring the internet, I have been able to find both a date, and a time subtraction formula. I have been able to modify them as well, however, there are a few fatal flaws in this. For example, subtracting time alone cannot take into consideration for time spanning across multiple days (thus returning negative numbers if your timeend is before your timestart).
What I am looking for is a way to subtract two DateTime fields without qRules or any type of code. I cannot use a SharePoint collumn to do this calc for me either, as the purpose of the form is primarily to submit to email. It also has to be done solely with Rules as below:
StartTime = 10/11/2014 4:00 PM
EndTime = 10/13/2014 9:00 AM
Return = 1 Day 17 Hours
If this is better to do in military time, I am happy to do that, but I am stuck!
My primary source of info for this was:
http://www.bizsupportonline.net/infopath2007/calculate-date-difference-infopath-rules-formulas.htm
I have also used:
http://www.bizsupportonline.net/infopath2003/time-calculations-infopath-using-rules.htm
Thoughts? Comments? Thanks for your time and consideration!