World Time Guides
50 original guides on DST, UTC, IANA zones, regional time zones, finance, legal deadlines, travel, and more.
50 guides
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Central America Time Zones
Guatemala, Costa Rica, Panama — offsets, no DST, and US/Mexico scheduling.
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Scandinavia Time Zones
Norway, Sweden, Finland, Denmark, Iceland — CET/CEST and Iceland's fixed UTC+0.
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Taiwan, Hong Kong, and Macau Time
All UTC+8 with no DST — IANA IDs and why they differ from Asia/Shanghai.
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Global Call Center Time Zone Scheduling
Follow-the-sun coverage, handoffs, and SLA windows across regions.
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Cross-Time-Zone Shift Work
24/7 factory, healthcare, and ops rosters — handoffs and UTC logging.
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Antarctica Time Zones
Research stations, UTC vs home-country time, and rare IANA Antarctica/* zones.
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Keeping Time Zone Data Updated
IANA tzdata releases, OS patches, and handling Mexico/Turkey rule changes.
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Global E-Commerce Sale Time Zones
Singles' Day, Black Friday, Prime Day — local midnight vs global UTC.
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Online Education and Time Zones
MOOC live classes, test deadlines, and cross-border university scheduling.
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A Brief History of Standard Time
From local solar time to GMT, time zones, and the IANA database today.