ESPP Market price on grant date?

[APP2]

I have the market price on purchase date at the end of the 3-month period in my records, but I do not have it on the grant date. Since these ESPP periods abut end-to-end, can I just use the fair market price at the end of the previous period as the market price on grant date? 

Or do I need to go back and look at the quoted price on the start date in the market? And if so, is it before the bell on the day or after trading has closed?

As an aside and a bug report / feature request for Intuit:

I'm pretty frustrated overall with the help the Turbo Tax software gives you with ESPP sales reporting. Almost ALL this information is in the supplemental information on the 1099 form, yet none of it was ingested. Additionally, as I add more information to each sale it redundantly asks me how many shares were sold, and when they were acquired which IS information that was already imported from the 1099.

Thanks for any help.

[APP2]

Ah, okay, I was able to find this information deep in the reports on my financial site.

If you are reading this, and work at a brokerage, may I humbly suggest that the reporting forms are provided to customers in the same form the IRS is requesting them rather than spreading the information out over 3 different forms?

[GeorgeM777]

As it appears you have the information you need, we were about to recommend that you use the market price on the grant date.  As to what price to use--opening, closing, average price, etc.--such information may be reported in your company's 10-Q (quarterly report).  Assuming if you have some doubts about the information you have, if you want to give us the name/ticker symbol of the company, we can research.  In the alternative, you might check with your employer if necessary at this point.  

@APP2