Add to Calendar Link & ICS File Generator

Put an "add to calendar" option in an invitation, newsletter or web page without a plug-in. Enter the event once and this generator makes ready links for Google Calendar, Outlook.com, Microsoft 365 and Yahoo Calendar, plus a standard .ics file that Apple Calendar, Outlook and almost every other calendar app can import. It handles time zones and daylight saving time, all-day events, reminders and repeating events.

How to use this tool

1. Enter the title, start and end, and the event's time zone (or tick all-day).
2. Optionally add a location, description, reminder and repeat rule.
3. Press Calculate.
4. Copy the link for each calendar service, or download the .ics file and attach it or link to it.

Formula

Google: dates=YYYYMMDDTHHMMSSZ/YYYYMMDDTHHMMSSZ (UTC) · Outlook: startdt=YYYY-MM-DDTHH:MM:SSZ · .ics: DTSTART;TZID=zone:YYYYMMDDTHHMMSS

Local times are converted to UTC with your browser's time zone database. The .ics file follows RFC 5545: text is escaped (\, ; , and new lines), lines are folded at 75 octets without splitting characters, and events in a named time zone carry a VTIMEZONE block with that zone's daylight-saving rules. All-day events use an exclusive end date, so a three-day holiday from 24 to 26 December ends on the 27th.

Example

A Team meeting on 15 January 2026 from 15:00 to 16:00 UTC becomes the Google link …&dates=20260115T150000Z/20260115T160000Z… and an Outlook link with startdt=2026-01-15T15:00:00Z. A weekly event at 7 p.m. in New York on 4 July 2026 is stored as 23:00 UTC, because New York is 4 hours behind UTC in summer.