Reference · built on requestCommons signalPlaces & geographic reference

IANA Time Zone Database

Global time zone boundaries, daylight saving rules, and historical UTC offset transitions maintained by IANA.

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About

The IANA Time Zone Database (often called tz, tzdata, or the Olson database) represents the canonical compilation of information about the world's time zones. It records civil time offsets from UTC, daylight saving time (DST) transition rules, and historical offset changes for geographic regions dating back to standard time introduction in the late nineteenth century.

Through Fibric, an operator references canonical timezone identifiers and DST boundary dates to schedule shift cutoffs, coordinate multi-site dispatch windows, and calculate compliant work hours across changing jurisdictional daylight saving thresholds.

This is a reference listing. It documents what Fibric would read from IANA Time Zone Database and what it could propose, based on the publisher's published interfaces. Fibric builds it under a managed deployment when you request it; selecting it here installs nothing.

Inputs

  • Canonical time zone identifiers organized by Area/Location naming conventions such as America/New_York
  • UTC offset definitions, leap second announcements, and daylight saving transition rules
  • Historical civil time offset modifications and legislative daylight saving adjustments dating back to 1970
  • Zone tabulations cross-referencing ISO country codes with latitude and longitude coordinates
  • Compressed source archive distributions containing tzdata and tzcode distributions released multiple times yearly

Proposed actions

Read-only. This feed informs operators; it changes nothing.

Proposed actions are target capabilities. Every action runs propose-first and needs a validated deployment and the appropriate permissions.

What you can build

  • Calculate accurate shift schedules across daylight saving transitions

    Evaluate workforce shift hours and punch logs against upcoming DST transitions, proposing adjusted start times to prevent overtime miscalculations.

    With Shift Coverage, Overtime Guard

  • Harmonize multi-region dispatch windows and customer promise dates

    Convert local promise dates across regional warehouses into UTC, aligning carrier pickup cutoffs and dispatch timing across changing local offsets.

    With Promise Date, Field Dispatch

Requirements

  • Standard date-time parsing library with tzdb compilation support such as zoneinfo, moment-timezone, or Chrono
  • Periodic synchronization of compiled tzdata tables to ingest legislative daylight saving revisions
  • Geographic coordinate to timezone lookup mapping to associate lat-long points with IANA zone identifiers
Authentication
None. The IANA Time Zone Database is freely distributed as public domain data via HTTP, FTP, and standard operating system package channels.

Limits

  • National governments occasionally change daylight saving rules on short notice before database updates can propagate
  • Database provides tabular timezone definitions rather than high-resolution geographic boundary polygon shapefiles
  • Historical transitions prior to 1970 may contain ambiguities due to inconsistent municipal record keeping

Access and pricing

Reference listing. Public feed access is separate from Fibric integration. If you request this feed, your quote covers the build, usage, and support.

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Questions and answers

What is the IANA Time Zone Database?
It is the authoritative open source reference for time zones, containing UTC offsets, daylight saving rules, and historical changes worldwide.
How frequently is tzdata updated?
IANA issues multiple updates each year whenever national or regional authorities enact changes to daylight saving or civil time offsets.
What license governs tzdata?
The database code and data files are dedicated to the public domain, allowing unrestricted commercial and private use.
Ask about IANA Time Zone Database

Ask about the capabilities and requirements in this listing.

For project-specific requirements, contact Fibric.

This Commons signal listing is developed, published, and supported by Fibric. It reads public data published by Internet Assigned Numbers Authority (iana.org). Upstream agencies and projects are the property of their respective owners, who are not affiliated with Fibric and do not sponsor or endorse this listing. Trademark policy