Can i recieve per diem for days i didnt work but still remained out of town

If your travel expenses are qualifying because you meet the rules, you are allowed to deduct the cost of staying there over the weekend or the cost of going home whichever is less.

I have included details about allowable employee business expenses reported on Form 2106.

• Generally, your tax home is your regular place of business or post of duty, regardless of where you maintain your family home. It includes the entire city or general area in which your business or work is located.

• If you have more than one regular place of business, your tax home is your main place of business. 
• If you do not have a regular or a main place of business because of the nature of your work, then your tax home may be the place where you regularly live.  See Employee Business Expense-Tax Home and Main Place of Business

If you do not have a regular or a main place of business or post of duty and there is no place where you regularly live, you are considered an itinerant (a transient) and your tax home is wherever you work. As an itinerant, you cannot claim a travel expense deduction because you are never considered to be traveling away from home.

This rest requirement is not satisfied by merely napping in your car. You do not have to be away from your tax home for a whole day or from dusk to dawn as long as your relief from duty is long enough to get necessary sleep or rest.

Attached is a chart of deductible expenses and the link above gives more detail for expense information. 

As an employee the expenses can be used on itemized deductions as employee business expense limited to the amount that is over 2% of your adjusted gross income.

Job-related expenses are reported on Form 2106 (Employee Business Expenses).

1. Open (continue) your return in TurboTax.
2. In the search box, search for 2106 and then click the "Jump to" link in the search results.
3. At the Tell us about the occupation you have expenses for screen, enter your occupation.
4. Click Continue and follow the onscreen instructions.

If you land on the Job-Related Expenses Summary screen instead, you can either Edit expenses for an existing job or click Add Another Occupation to enter expenses for a new one.

Tip: If the only work-related use of your car is commuting back and forth between your home and main workplace, do not enter any vehicle mileage or expenses. The IRS doesn't let employees deduct commuting costs.