How to check the date of submitting an application for immigration to the United States? Besides, is the application date the same as the application submission date?

After submitting the application, there will be an I-797C notice, commonly known as P 1, with the date of receipt, priority date and receipt number. The first is the date when the immigrant received the application, the second is the submission date when USCIS officially accepted your application, and the third is your case number. You can go to the USCIS website and use this number to check the progress of the case and know when to come to P2.