Calendly

A Calendly clone: an admin configures availability once, guests pick a free slot on a public booking page, and Windmill creates the Google Calendar event (with a Meet link) and sends the confirmation email.

Windmill concepts demonstrated

• Two raw apps — a public booking page for guests, an admin page for availability.
• Custom resource type — holds the availability config: hours, days, duration, timezone.
• Resources — Google Calendar and SMTP credentials.
• Datatables — stores the config and the bookings.
• Setup script — creates the schema on first run, safe to re-run.

Layout

calendly_setup_db.ts             Create schema + config/bookings tables (idempotent)
calendly_get_config.ts           Read the availability config
calendly_update_config.ts        Update host, title, hours, duration, timezone
calendly_get_available_slots.ts  Free slots for a date (config − existing bookings)
calendly_book_slot.ts            Create the Google Calendar event + Meet link, store
                                 the booking, send the confirmation over SMTP
calendly_booking__raw_app/       Public booking page
calendly_dashboard__raw_app/     Admin configuration page
calendly__raw_app/               Leftover scaffold (no raw_app.yaml) — safe to delete

Notable implementation details

• Timezone handling is explicit: toRfc3339WithOffset() converts a naive YYYY-MM-DD + HH:MM into an RFC3339 timestamp carrying the config's IANA offset, so Google Calendar receives an unambiguous instant.
• The Meet link is requested through conferenceDataVersion=1 and sendUpdates=all on the Calendar API call.
• Scripts and descriptions in this project are written in French.

Try it locally

wmill script preview f/calendly/calendly_get_available_slots -d '{"date_str":"2026-08-03"}'