All forms filed via TEAS are stamped Eastern Time when received on the USPTO server. The time stamp is applied at the moment the payment process is completed and the Success screen is displayed. The time stamp applied by the TEAS server is the official time the USPTO received the application or form; the time the transmission was begun is not a factor considered when assigning the filing date. The official filing date and time can be found at the bottom of your e-mail confirmation. Any submission that arrives as of 11:59 p.m. EST will be given that day's filing date (i.e., regardless of USPTO"s "normal" business hours).