ChatGPT is incredibly useful for writing event descriptions, emails, marketing copy, and reminders, but it cannot reliably create Add-to-Calendar links on its own. Calendar links require precise formatting, strict URL encoding, correct date structures, and guaranteed compatibility with Google, Apple, Outlook, and other platforms. That’s why CalendarLink created Smart Links: the first Add-to-Calendar method designed specifically for LLMs, such as ChatGPT.

With CalendarLink Smart Links, ChatGPT can generate fully functional Add-to-Calendar links instantly, using nothing more than simple URL parameters. No APIs. No authentication. No plug-ins. Just reliable automation.

This article shows you exactly how to do it and includes the full instruction template you can paste directly into ChatGPT.

Why Use ChatGPT with CalendarLink Smart Links?

If you regularly host webinars, meetings, workshops, or community events, ChatGPT can automate all event creation for you. With Smart Links, ChatGPT can:

• Build fully encoded Add-to-Calendar links
• Format dates, times, and time zones correctly
• Automatically insert descriptions and locations
• Output final CalendarLink URLs instantly
• Reduce manual work and eliminate mistakes

Because Smart Links follow a predictable structure, ChatGPT can generate them with 100% accuracy.

How do I create an Add to Calendar link with ChatGPT?

To create an Add to Calendar link with ChatGPT, paste CalendarLink’s Smart Link instructions into ChatGPT and let the model generate a fully encoded URL. When the URL is opened in any browser, CalendarLink instantly creates the event and redirects to the final event page. ChatGPT can also follow the redirect and return the final https://calendarlink.com/event/... link.

2. Smart Link (no auth, easiest, free)

The Smart link is a simple URL with query parameters. When anyone opens this link, CalendarLink immediately generates the event and redirects to the final CalendarLink URL (e.g. https://calendarlink.com/event/Xx182x).

This is ideal for LLMs, because they can just: Build the smart link URL (Optional) "visit"/resolve it and Return the final https://calendarlink.com/event/... URL to the user

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2.1 Smart link base URL

https://my.calendarlink.com/link

2.2 Example smart link

https://my.calendarlink.com/link?collection=3b8e59b7-0bcf-4e38-a8cc-a42d5a555cc4&title=Test%20event&start=2025-12-21%2016%3A00&duration=120&timezone=Europe%2FAmsterdam&description=Test%20description&location=https%3A%2F%2Fgoogle.com

2.3 Parameters

All parameters must be URL-encoded.

‍collection

‍Default public collection (free to use): 3b8e59b7-0bcf-4e38-a8cc-a42d5a555cc4

Or: create a free CalendarLink account and use your own collection ID.

‍title (required)

Event title. Example: title=Marketing%20Launch%20Call

‍start (required)

Date and time in format: YYYY-MM-DD HH:mm

Example (not encoded): 2025-12-21 16:00

URL-encoded: start=2025-12-21%2016%3A00

‍duration (required)

Event duration in minutes.

Example: duration=120 for 2 hours.

‍timezone (required) IANA timezone string.

Example: Europe/Amsterdam, America/New_York, Asia/Tokyo.

URL example: timezone=Europe%2FAmsterdam

‍description (optional)

Long text description. Can be empty, but omit the parameter if you don't need it.

Example: description=Quarterly%20planning%20session

‍location (optional)

For online events, use a URL Example: https://zoom.us/…For physical events, use an address Example: Street%20name%2013%2C%20New%20York%2C%20New%20York

Omit if not needed.

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2.4 What an LLM should do (instructions)

You can embed the following instructions into a system prompt / tool description:

When the user asks you to create an event, generate a CalendarLink smart link.

Use this base URL: https://my.calendarlink.com/link Use collection=190fceeb-e934-4425-8590-ce0bdbcba594 (or another collection ID the user provides).

Add the following URL-encoded query parameters: title: required event title start: YYYY-MM-DD HH:mm in the user's timezone duration: in minutes timezone: an IANA timezone, e.g. Europe/Amsterdam Optional: description, location

Return either: The full smart link itself, or Even better: resolve the smart link and return the final redirect URL, which looks like https://calendarlink.com/event/XYZ123.

Always ensure proper URL encoding for spaces and special characters.

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2.5 Example LLM output (smart link)

This is your smart links that generates the event instantly:

https://my.calendarlink.com/link?collection=190fceeb-e934-4425-8590-ce0bdbcba594&title=Team%20Meeting&start=2025-12-21%2016%3A00&duration=120&timezone=Europe%2FAmsterdam&description=Quarterly%20planning%20session&location=Conference%20Room%20A

Visit the url and copy the url in the browser if you want to share this event (e.g. https://calendarlink.com/event/your-event).

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2.6 Example LLM output (final redirect URL) If the LLM (or your backend agent) can follow redirects:

This is your smart links that generates the event instantly:

https://my.calendarlink.com/link?collection=190fceeb-e934-4425-8590-ce0bdbcba594&title=Team%20Meeting&start=2025-12-21%2016%3A00&duration=120&timezone=Europe%2FAmsterdam&description=Quarterly%20planning%20session&location=Conference%20Room%20A

This is your final url you can share with anyone: https://calendarlink.com/event/your-event

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Event title:

Date & time:

Timezone:

Location or URL:

Event description:

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This is currently the only reliable way for AI models to generate Add-to-Calendar links.

What ChatGPT Should Do (LLM Instructions)

Here are the exact instructions you should paste into ChatGPT to enable Smart Link generation:

When the user asks you to create an event, generate a CalendarLink Smart Link.

Use this base URL:
https://my.calendarlink.com/link

Use this collection ID unless the user provides another:
collection=190fceeb-e934-4425-8590-ce0bdbcba594

Add the following URL-encoded parameters:
• title (required, event title)
• start (format: YYYY-MM-DD HH:mm in the user's timezone)
• duration (in minutes)
• timezone (valid IANA timezone, e.g. Europe/Amsterdam)
Optional parameters:
• description
• location

Return either:

1. the full Smart Link, or
2. if you can follow redirects, also return the final CalendarLink event URL, which looks like:
   https://calendarlink.com/event/XYZ123

Always ensure proper URL encoding for all spaces and special characters.

Example Smart Link (LLM Output)

This is an example of your Smart Link that generates the event instantly:
https://my.calendarlink.com/link?collection=190fceeb-e934-4425-8590-ce0bdbcba594&title=Team%20Meeting&start=2025-12-21%2016%3A00&duration=120&timezone=Europe%2FAmsterdam&description=Quarterly%20planning%20session&location=Conference%20Room%20A

Visit the link in any browser and CalendarLink will create the event automatically.

Why Smart Links Are the Best LLM Event Method

Smart Links are designed specifically for AI systems:

• No API keys or authentication
• Impossible for ChatGPT to “hallucinate” incorrect formats
• Compatible with all calendar apps
• Automatically encoded
• Works for both virtual and in-person events
• Supports recurring events and Subscription Calendars
• Perfect for Slack bots, automations, GPTs, and CRM integrations

This is the most reliable, scalable way to produce calendar events using AI.

ChatGPT is powerful, but it needs structure

CalendarLink Smart Links provide that structure, enabling ChatGPT to generate Add-to-Calendar links instantly, safely, and accurately.

You can now use ChatGPT as a fully automated event generator.

Start creating Add-to-Calendar events instantly at calendarlink.com.

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