Free Timezone Tools & Guides
A small toolbox for anyone dealing with timezones regularly — developers, remote teams, and anyone scheduling across borders.
Tools
Widget
Embed a Live Clock
Free HTML snippet for your site or blog
Planner
Meeting Planner
Compare two timezones and find overlap hours
Converter
Unix Timestamp Converter
Epoch seconds/ms to UTC and back — handles Cosmos DB _ts
Quiz
World Timezone Quiz
10 questions, instant score, share your result
Cities
World Cities
Current local time in 25 major cities
Map
Day & Night Map
Live world map of daylight vs. night
DST
DST Tracker
Who's on daylight saving right now, live
Convert
Timezone Conversions
25 curated pairs, live comparison and full table
Markets
Stock Market Hours
Which major exchanges are open right now
Articles & Guides
Guide
Timezones in JavaScript
Handling UTC and conversion without libraries
Guide
Managing Remote Teams
Scheduling and communication across timezones
Guide
Cron Jobs and Time Zones
Why scheduled jobs fire at the wrong time around DST
Guide
Timestamp Formats Compared
ISO 8601 vs. RFC 3339 vs. Unix timestamp
Guide
Timezones in Python
zoneinfo, pytz, and datetime pitfalls
Guide
Database & Log Time Zone Bugs
TIMESTAMP vs. TIMESTAMPTZ and merged server logs
Guide
Testing Time Zone Bugs
How to catch DST bugs before production does
History
The History of UTC
From the railways to atomic clocks
History
History of World Time Zones
How the 24-zone map came to be