How Many Seconds Till Tomorrow? - The Modern JavaScript Tutorial

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To get the number of milliseconds till tomorrow, we can from “tomorrow 00:00:00” substract the current date.

First, we generate that “tomorrow”, and then do it:

function getSecondsToTomorrow() { let now = new Date(); // tomorrow date let tomorrow = new Date(now.getFullYear(), now.getMonth(), now.getDate()+1); let diff = tomorrow - now; // difference in ms return Math.round(diff / 1000); // convert to seconds }

Alternative solution:

function getSecondsToTomorrow() { let now = new Date(); let hour = now.getHours(); let minutes = now.getMinutes(); let seconds = now.getSeconds(); let totalSecondsToday = (hour * 60 + minutes) * 60 + seconds; let totalSecondsInADay = 86400; return totalSecondsInADay - totalSecondsToday; }

Please note that many countries have Daylight Savings Time (DST), so there may be days with 23 or 25 hours. We may want to treat such days separately.

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