Most scheduling tools handle the happy path: invitee in New York, you in San Francisco, meeting shows correctly in both zones. The edge cases — DST transitions, IANA-zone updates, half-hour zones like India — are where tools fail.
The technical picture
Timezone-aware booking is fundamentally a problem of clock coordination — respecting IANA time zones, DST transitions, and invitee preferences while displaying consistent times on both sides of the booking handshake.
How Cal Clear handles time zones
Cal Clear uses IANA zone identifiers throughout. Your working hours are stored in your local zone; invitee's booking-page display converts to theirs via browser API. DST transitions are handled per-zone (not via a fixed UTC offset), so transitions don't produce off-by-one bugs. Time-zone display on confirmation emails and calendar invites is always explicit — 'Thursday, April 25, 2 PM Eastern Time' rather than the ambiguous 'Thursday, 2 PM'.
What to configure for your time-zone situation
In settings, verify your IANA zone matches your actual location (not just the UTC offset). For global-client work, use the browser's Intl.DateTimeFormat API to display confirmation text in the invitee's zone. And always include the time zone name explicitly in confirmation text.
Frequently Asked Questions
Does Cal Clear handle daylight saving correctly?
Yes. Cal Clear uses IANA zone identifiers, which automatically handle DST transitions for every supported region. You don't need to manually adjust availability around spring-forward or fall-back.
Can I offer different availability to different time zones?
Yes. Create a separate link type per time-zone target (e.g., 'APAC clients only' with availability matching your late-evening block). Cal Clear's Pro plan supports multiple link types.
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