Time Zone

• CURIE: gmeow:TimeZone
• IRI: https://blackcatinformatics.ca/gmeow/TimeZone
• Category: class
• Defined by: gmeow:slices/calendar
• Box roles: TBox role (What is this?)

A time zone identified by an IANA tzid (e.g. America/Toronto). Used by calendars, schedules, and events to express civil time relative to a geographic reference position.

Structure

Subclass of: gmeow:Entity, gufo:Object

Practical Pattern

Use gmeow:TimeZone as a specialized kind of gmeow:Entity, gufo:Object. Add statement metadata or a standpoint when the assertion needs provenance, confidence, or vantage.

Example Snippets

These snippets are generated from canonical slice examples and trimmed to the Turtle blocks where this term appears.

Recurring Meeting

• Source: slices/core/calendar/examples/recurring-meeting.ttl
• Examples catalog: open in catalog#example-slices-core-calendar-examples-recurring-meeting

# SPDX-FileCopyrightText: 2026 Blackcat Informatics® Inc. <paudley@blackcatinformatics.ca>
# SPDX-License-Identifier: CC-BY-4.0
#
# Worked example: a recurring meeting with invitations. A gmeow:EventSchedule
# repeats a TEMPLATE event by a gmeow:RecurrenceRule (an RFC 5545 RRULE string),
# all anchored in an explicit gmeow:TimeZone (IANA id) — so "every Monday 09:00"
# is unambiguous across DST. Invitations are reified gmeow:EventInvitations
# carrying both the organiser-side gmeow:invitationStatus and the invitee's own
# gmeow:rsvpStatus. The event's kind is an open vocabulary: there is no seed
# "meeting" EventType, so one is minted (the custom-value idiom, P9).
@prefix gmeow: <https://blackcatinformatics.ca/gmeow/> .
@prefix ex:    <https://blackcatinformatics.ca/gmeow/examples/calendar/> .
@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd:   <http://www.w3.org/2001/XMLSchema#> .

ex:edmonton a gmeow:TimeZone ; gmeow:timeZoneIanaId "America/Edmonton" .

Common Companion Terms

gmeow:Entity

External Equivalences

Equivalent or closely aligned targets: ical

Linkages

Generated from the canonical mapping DSL. SSSOM files are the generated public interchange form for term equivalences.

Term Equivalences

Usage Advice

Use when

• Use to name a civil offset by its IANA tzid for calendars, schedules, and events — the local-time anchor that decides how a UTC dateTime renders as wall-clock time.

Avoid when

• Avoid conflating it with a temporal frame's gmeow:ReferencePosition at the physics layer (a TimeZone is the civil-offset case of one) and avoid encoding the offset numerically instead of naming the tzid, which loses DST rules.

How to use

• Give it a gmeow:timeZoneIanaId and reference it from gmeow:calendarTimeZone, gmeow:scheduleTimeZone, or gmeow:eventTimeZone; let the tzid, not a fixed offset, carry the DST behaviour.

Examples

• ex:torontoZone a gmeow:TimeZone; gmeow:timeZoneIanaId "America/Toronto".