[HN Gopher] Show HN: Kalendis - Scheduling API (keep your UI, we...
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       Show HN: Kalendis - Scheduling API (keep your UI, we handle
       timezones/DST)
        
       Kalendis is an API-first scheduling backend. You keep your UI; we
       handle the gnarly parts (recurrence, time zones, DST, conflict-safe
       bookings).  What it does: * MCP tool: generates typed clients and
       API route handlers (Next.js/Express/Fastify/Nest) so you can
       scaffold calls straight from your IDE/agent tooling. * Availability
       engine: recurring rules + one-off exceptions/blackouts, returned in
       a clean, queryable shape. * Bookings: conflict-safe endpoints for
       creating/updating/canceling slots.  Why we built it: We kept
       rebuilding the same "hard parts" of scheduling: time zones/DST edge
       cases, recurring availability, conflict-aware booking, etc. We
       wanted a boring, reliable backend so we could ship product features
       without adopting a hosted scheduling UI.  How it's helped: We
       stopped re-implementing DST/recurrence math and shipped booking
       flows faster. One small team (just 2 developers) built a robust
       booking platform for their business using Kalendis--they kept full
       control of their UX without spending lots of cycles on scheduling
       infrastructure. The MCP generator cut the glue code: drop in a
       typed client or route, call the API, move on.  Some tech details: *
       REST API with ISO-8601 timestamps and IANA time zones * Recurring
       availability + one-off exceptions (designed to compose cleanly) *
       Focused scope: users, availability, exceptions, bookings (not a
       monolithic suite)  The MCP server exposes tools like generate-
       frontend-client, generate-backend-client, generate-api-routes, and
       list-endpoints. Add to your MCP settings:                 {
       "mcpServers": {         "kalendis": {          "command": "npx",
       "args": ["-y", "@kalendis/mcp"]         }        }       }
       How to try it: Create a free account - get an API key.
       (https://kalendis.dev). Then hit an endpoint:                 curl
       -H "x-api-key: $KALENDIS_API_KEY" \      "https://api.kalendis.dev/
       v1/availability/getAvailability?userId=<user-id>&start=2025-10-07T0
       0:00:00Z&end=2025-10-14T00:00:00Z&includeExceptions=true"
       Happy to answer questions and post example snippets in the thread.
       Thanks for taking a look!
        
       Author : dcabal25mh
       Score  : 6 points
       Date   : 2025-11-17 18:05 UTC (4 hours ago)
        
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