i94-count-days-in-usa.js

// This script counts how many days you have been in the USA
// This is a personal script, use it at your own risk
// This is not an official tool and it can do wrong calculations
// which might result in loss in visa status, green card, citizenship
// and whatever you can think of

// This extracts data from the i94 website from the history result view

function daysInYear(year) {
    var recs = angular.element(".history-results").scope().vm.recs
    var count = 0
    var prev = null
    recs.forEach(function (rec) {
        if (rec.eventType === "Arrival") {
            if (prev) {
                var departure = new Date(rec.eventDate);
                var arrival = new Date(prev);
				if (arrival.getUTCFullYear() != year) { return }
                var timeDiff = Math.abs(departure.getTime() - arrival.getTime());
                var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24)); 
                count += diffDays
                console.log(count, "from", rec.eventDate, "to", prev)
            }
        } else { // Departure
            prev = rec.eventDate
        }
    })
	console.log("You have been:", count, "in", year)
}
daysInYear(2016)