For foreign travelers to the United States, leaving the country on time can be a bit of a challenge--many do not actually understand by what date they are expected to leave, and some are in no hurry to leave, not understanding the serious legal consequences that can accompany a visa overstay.
In 2016, for example, the Department of Homeland Security (DHS) reports that 739,478 travelers to the U.S. overstayed their permitted period of admission, which means a total overstay rate of 1.47%.
In response to this problem, U.S. Customs and Border Protection (CBP) has created a new procedure by which it will send email reminders to travelers, advising them of their last possible departure date from the United States according to the terms of their visa or admission.
Travelers will also be able to check on this information using a new feature on the CBP's I-94 website (you will need to click "How Much Longer May I Remain in the U.S.?"). Eligible Visa Waiver Program travelers will also be able to check how much longer they can remain in the United States without overstaying the terms of their admission.
CBP states that the I-94 website isn't completely finished yet; it is still working to incorporate all of the various types of nonimmigrant (temporary) visas.