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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Global Business Hours Reference
Typical office hours, lunch customs, and when not to call partners across regions.
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How to Use the Time Zone Converter
Step-by-step: pick countries, enter date/time, read DST flags, and interpret results correctly.
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Unix Timestamps and UTC
What the Unix epoch is, seconds vs milliseconds, and how timestamps relate to local time.
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24-Hour Clock and Military Time
How to read 24-hour time, why aviation and medicine use it, and tips for international scheduling.
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China Time Zone: Beijing Time Nationwide
Why all of China uses UTC+8 (Beijing Time) with no DST, and local customs in western regions.
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United States Time Zones Guide
US Eastern, Central, Mountain, Pacific, Alaska, Hawaii — DST rules and abbreviation pitfalls.
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European Time Zones and DST
Western, Central, and Eastern Europe; EU DST harmony and UK, Turkey, Russia exceptions.
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Australia Time Zones Guide
Eastern, Central, Western zones; southern-hemisphere DST and states that opt out.
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Russia's 11 Time Zones Guide
Kaliningrad UTC+2 to Kamchatka UTC+12; no DST since 2014 and scheduling tips.
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Travel Time Zone Tips
Before, during, and after flights: watches, phones, bookings, and avoiding date-line mistakes.