Timezone
Slot Proof Local only

01 Before clients find the broken hour

Prove your slots survive the clock change.

Turn working hours or an ICS availability file into an 18-month, five-zone inspection. See shifted, skipped, and repeated times before you publish a booking link.

Inspect my hours
  • No calendar login
  • Runs in your browser
  • Exports the evidence
Five parallel tracks cut into a concrete slab, with moss around aligned markers and one amber offset seam.
Five zones. One seasonal seam. Make it visible.

02 Build the test

Describe what should be bookable

Your data stays on this device. We calculate with the IANA timezone data built into your browser.

Availability source
Weekly working windows

03 Proof board

Your test matrix will land here

Run the proof to trace every generated start time, isolate DST seams, and export a portable review.

04 What the proof means

A small test rig for civil time

  1. 1

    Generate

    Every valid meeting start is generated from your declared wall-clock window for the next 18 months.

  2. 2

    Project

    Each instant is projected into every selected IANA zone using the timezone rules in this browser.

  3. 3

    Compare

    Week-equivalent starts are compared. Shifts, skipped times, repeated times, and offset-only changes are marked.

  4. 4

    Carry

    Download the complete CSV or share a link that recreates the weekly-hours configuration without an account.