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© 2026 TaskJunction · Made by Vaibhav Dhokpande · World Clock

What is a World Clock?

A world clock displays the current time simultaneously in multiple cities and time zones. It's essential for scheduling international meetings, tracking deadlines across time zones, and coordinating with remote teams or clients in different countries.

Common Time Zones for Indian Professionals

IST (India Standard Time), UTC+5:30: India. No daylight saving.
UTC+0 / GMT (London): IST is 5 hours 30 minutes ahead. UK observes BST (UTC+1) in summer.
EST (New York), UTC−5: IST is 10.5 hours ahead in winter, 9.5 hours in summer.
PST (San Francisco), UTC−8: IST is 13.5 hours ahead. Silicon Valley working hours.
SGT (Singapore), UTC+8: IST is 2.5 hours behind Singapore.
GST (Dubai), UTC+4: IST is 1.5 hours ahead of Dubai.

💡 Quick mental math: To convert IST to US Eastern time, subtract 10.5 hours (winter) or 9.5 hours (summer/DST). A 9:00 AM EST call = 7:30 PM IST, after office hours for most Indian engineers.

Frequently Asked Questions

Why does India have a half-hour offset (UTC+5:30)?

India adopted a single time zone in 1947 for national unity. The +5:30 offset was chosen as a geographic compromise between the eastern and western extremes of the country. India does not observe daylight saving time.

What is Daylight Saving Time (DST)?

DST is the practice of advancing clocks by 1 hour in summer to extend evening daylight. The US, UK, and most of Europe observe DST. India, China, Japan, and most of Asia and Africa do not. This means the time difference between IST and US/UK changes by 1 hour between summer and winter.

How do I schedule a meeting across multiple time zones?

Find a time that falls within working hours (9am–6pm) in all relevant zones. For India + US West Coast, the overlap window is roughly 8:00–9:30 PM IST (7:30–9:00 AM PST). World Clock tools with meeting planner features (like World Time Buddy) can help visualize overlaps.