… calculate the number of seconds in the current year using JavaScript:
function seconds_in_this_year() { // get length of this year by subtracting "Jan 1st, /This Year/" // from "Jan 1st, /Next Year/" var now = new Date(); var current_year = now.getFullYear(); var jan_first = new Date(current_year, 0, 1, 0, 0, 0, 0); var jan_next = new Date(current_year + 1, 0, 1, 0, 0, 0, 0); return (jan_next.getTime() - jan_first.getTime()) / 1000; }