Make api call / call a function at a specified time approximately accurate to the millisecond

makeApiCall.js

function makeApiCall(time) {
  // Get the current date and time
  var now = new Date();

  // Set the date and time for the specified time
  var specifiedTime = new Date();
  specifiedTime.setHours(time.hours);
  specifiedTime.setMinutes(time.minutes);
  specifiedTime.setSeconds(0);
  specifiedTime.setMilliseconds(0);

  // If it's after the specified time, set the date for the next occurrence of that time
  if (now > specifiedTime) {
    specifiedTime.setDate(specifiedTime.getDate() + 1);
  }

  // Calculate the time until the next occurrence of the specified time
  var timeUntilSpecifiedTime = specifiedTime - now;

  // Set a timeout to make the API call at the next occurrence of the specified time
  setTimeout(function() {
    // Make the API call here
  }, timeUntilSpecifiedTime);
}

// Make an API call at 9am
makeApiCall({hours: 9, minutes: 0});

// Make an API call at 1pm
makeApiCall({hours: 13, minutes: 0});

// Make an API call at 11pm
makeApiCall({hours: 23, minutes: 0});