Determine Minutes Until Midnight

How would you go about determining how many minutes until midnight of the current day using javascript?

Solution 1:

functionminutesUntilMidnight() {
    var midnight = newDate();
    midnight.setHours( 24 );
    midnight.setMinutes( 0 );
    midnight.setSeconds( 0 );
    midnight.setMilliseconds( 0 );
    return ( midnight.getTime() - newDate().getTime() ) / 1000 / 60;
}

Solution 2:

Perhaps:

functionminsToMidnight() {
  var now = newDate();
  var then = newDate(now);
  then.setHours(24, 0, 0, 0);
  return (then - now) / 6e4;
}

console.log(minsToMidnight());

or

functionminsToMidnight() {
  var msd = 8.64e7;
  var now = newDate();
  return (msd - (now - now.getTimezoneOffset() * 6e4) % msd) / 6e4;
}

console.log(minsToMidnight())

and there is:

functionminsToMidnight(){
  var d = newDate();
  return (-d + d.setHours(24,0,0,0))/6e4;
}

console.log(minsToMidnight());

or even a one-liner:

minsToMidnight = () => (-(d = newDate()) + d.setHours(24,0,0,0))/6e4;

console.log(minsToMidnight());

Solution 3:

You can get the current timestamp, set the hours to 24,

and subtract the old timestamp from the new one.

functionbeforeMidnight(){
    var mid= newDate(), 
    ts= mid.getTime();
    mid.setHours(24, 0, 0, 0);
    returnMath.floor((mid - ts)/60000);
}

alert(beforeMidnight()+ ' minutes until midnight')

Solution 4:

Here's a one-liner to get milliseconds until midnight

new Date().setHours(24,0,0,0) - Date.now()

And for the minutes until midnight, we devide that by 60 and then by 1000

(newDate().setHours(24,0,0,0) - Date.now()) / 60 / 1000