Google Apps Script to automatically show or hide slides in Google Slides using comma-separated dates in the Speaker Notes

slideOnOffDates

//  Create a separate Google Slides presentation to hold the inactive slides and paste the URL here:

inactiveSlidesUrl = "https://docs.google.com/presentation/d/ABABABABABABABABABABABABABABABABA0/edit"


// In your Google Slides presentation,
// go to Utilities > Script Editor and paste this code.
//
// In the Speaker Notes for each slide,
// list the dates that slide should be toggled on or off,
// in MM/dd/yyyy format,
// separated by commas.
//
//  - Correct: 01/01/2020,01/02/2020
//  - Wrong:   1/1/2020,1/2/2020
//  - Wrong:   1/1/20,1/1/20
//  - Wrong:   01/01/2020-01/02/2020
//  - Correct: 01/01/2020,01/02/2020,01/01/2021,01/02/2021
//  - Wrong:   01/01/2020-01/02/2020,01/01/2021-01/02/2021
// 
// The script will run each night and move slides
// from your presentation to the inactive slides presentation
// if today's date is in the Speaker Notes.
//
// The script will also run each morning and move slides
// from the inactive slides presentation to your presentation
// if today's date is in the Speaker Notes.
//
// When the script moves a slide,
// today's date is removed from the speaker notes.
//
// Add a trigger to your script to run the following function every day between 10 PM and 11 PM:
function turnOffSlides() {
  var presentation = SlidesApp.getActivePresentation();
  var inactiveSlides = SlidesApp.openByUrl(inactiveSlidesUrl)
  moveSlidesByDateInSpeakerNotes(presentation,inactiveSlides);
}

// Add a trigger to your script to run the following function every day between 12 AM and 1 AM:
function turnOnSlides() {
  var presentation = SlidesApp.getActivePresentation();
  var inactiveSlides = SlidesApp.openByUrl(inactiveSlidesUrl)
  moveSlidesByDateInSpeakerNotes(inactiveSlides,presentation);
}

function moveSlidesByDateInSpeakerNotes(source,destination) {
  var today = Utilities.formatDate(new Date(), Session.getScriptTimeZone(), "MM/dd/yyyy");  // get today's date as a string in MM/dd/yyyy format
  var slides = source.getSlides();
  for (var i = 0; i < slides.length; i = i + 1) {                                           // go through each slide in the presentation
    var slide = slides[i];
    var speakerNotes = slide.getNotesPage().getSpeakerNotesShape().getText();               // get the speaker notes
    var speakerNotesText = speakerNotes.asString().replace(/\s/g,"");                       // remove any whitespace
    if (speakerNotesText === "" || speakerNotesText === undefined) {                        // if the Speaker Notes are blank, continue to the next slide.
      continue;
    }
    var dates = speakerNotesText.split(",");                                                // use the commas to split the Speaker Notes string into an array of strings
    var badDate = getBadString(dates,/[0-1][0-9]\/[0-3][0-9]\/[0-9]{4}/)                    // make sure the dates are in MM/dd/yyyy format
    if (badDate !== null) {                               
      throw "Invalid date on slide #" + (i + 1) + ": '" + badDate + "'. Date must be in MM/dd/yyyy format.";
    }
    for (var j = 0; j < dates.length; j = j + 1) {                                          // go through each date
      if (dates[j] === today) {                                                             // if the date matches today's date:
        dates.splice(j,1);                                                                  //  - remove the date from the list
        speakerNotes.setText(dates.join())                                                  //  - put the modified list of dates back in the speaker notes for that slide
        destination.appendSlide(slide);                                                     //  - move the slide to the destination presentation
        slide.remove();                                                                     //  - remove the slide from the source presentation
        break;                                                                              //  - don't check any more dates for this slide; go to the next slide.
      }
    }
  }
}

function getBadString(strings,regexPattern) {
  for (var j = 0; j < strings.length; j = j + 1) {
    if (!regexPattern.test(strings[j])) {
      return strings[j];
    }
  }
}

This is useful code, thanks for sharing it.