@shreyasburse1709 , Namaste Shreya ji. Your residency start date is usually the first day that you were present in the US during the tax year under consideration. see here --> Residency starting and ending dates | Internal Revenue Service
So while you are resident for the whole year, file your return using form 1040 ( supported by TurboTax ), you still have to use itemized deduction --- Standard deduction needs full Calendar year presence. So the actual day you entered the US is important.
Is there more I can do for you ?
Namaste
pk
