Sync Spreadsheet Data with Google Calendar

The syncToCalendar() function in Google Apps Script is designed to sync events from a Google Sheet to the user’s default Google Calendar. Here’s a detailed breakdown of how the function operates:

  1. Get Active Sheet: The script starts by obtaining the active sheet of the current Google Spreadsheet. This is where the event data is assumed to be stored.
  2. Read Data: It fetches all the data in the active sheet using getDataRange(), which returns a range covering all the filled cells. getValues() is then called on this range to retrieve the data in a 2D array format.
  3. Access Calendar: The script accesses the user’s default calendar through CalendarApp.getDefaultCalendar().
  4. Event Processing:
    • For each row in the sheet (each event), the script reads the event title, start date, and end date from the columns.
    • It checks the default calendar for any existing events that match the title and occur between the specified start and end dates using getEvents(startDate, endDate, options).
    • If no existing event matches the criteria (existingEvents.length === 0), it creates a new event with the title, start date, and end date from the sheet.

Key Assumptions

  • The events are stored with the event title in the first column, the start date in the second column, and the end date in the third column.
  • Dates in the sheet are in a format recognizable by JavaScript’s Date object.

Potential Improvements

  • The function does not handle errors (e.g., incorrect date formats).
  • It assumes that the first row of data immediately contains event information, which might not always be the case (e.g., if there’s a header row).
function syncToCalendar() {
 const sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
 const eventsRange = sheet.getDataRange();
 const events = eventsRange.getValues();
 const calendar = CalendarApp.getDefaultCalendar();
 events.forEach(event => {
 const existingEvents = calendar.getEvents(new Date(event[1]), new Date(event[2]), {search: event[0]});
 if (existingEvents.length === 0) { // No existing event matches
 calendar.createEvent(event[0], new Date(event[1]), new Date(event[2]));

Sample Data Table in Sheets

Here’s an example of how the data in your Google Sheet might look:

Event TitleStart DateEnd Date
Team Meeting2024-05-01 09:00AM2024-05-01 10:00AM
Project Deadline2024-05-15 12:00PM2024-05-15 01:00PM
Client Presentation2024-05-20 02:00PM2024-05-20 03:00PM

Explanation of the Table:

  • Event Title: Describes the event.
  • Start Date: The date and time when the event starts.
  • End Date: The date and time when the event ends.

This script is particularly useful for automating calendar entries from a prepared schedule in a spreadsheet, helping to reduce manual entry errors and save time.