World Clock Blog
Short, honest guides to how time zones actually work — why the difference between two cities changes twice a year, why some places are 30 or 45 minutes off the hour, and what UTC really means. Every number in these guides is checked against the same IANA time zone database that powers the live clocks on this site.
How Time Zones Work — A Simple Guide
Why the world is divided into time zones at all, how UTC offsets work, why countries like India and Nepal sit at :30 and :45 past the hour, and how your phone always knows the right time.
Karachi to New York Time Difference — And Why It Changes Twice a Year
New York is 9 hours behind Karachi in summer and 10 hours behind in winter. Here is exactly why, the 2026 dates when the gap changes, and worked examples for planning calls.
UTC vs GMT — What's the Difference?
People use UTC and GMT as if they were the same thing. They are not: one is the world's atomic time standard, the other is a time zone. Here is the difference, and why Pakistan is UTC+5.