You pick two time zones from the dropdown. The tool subtracts their UTC offsets (stored as fixed numbers) to get the hour difference, then applies those offsets to your browser's current UTC time to show the local clock in each city. Noon comparison simply shifts 12:00 by the difference. It uses standard-time offsets only and does not adjust for daylight saving time.
DST rules vary by country, region, and year — some areas observe it, others do not, and the start/end dates differ. This tool uses fixed standard-time offsets for simplicity. During DST months, the actual difference may shift by one hour. Always double-check near DST transition dates.
Several countries chose offsets that don't fall on whole hours. India Standard Time (IST) is UTC+5:30, Nepal is UTC+5:45, and parts of Australia use UTC+9:30. These reflect geographic or historical decisions by each nation.
Use the noon comparison as a starting point — it shows what noon in your city looks like in the other. Then adjust to find a window within normal business hours (roughly 9 AM – 6 PM) for both sides. For very large offsets (12+ hours), an early morning or late evening slot for one party is usually unavoidable.
In practice, they represent the same time (UTC+0). UTC is the modern international standard maintained by atomic clocks; GMT is the older astronomical standard tied to the prime meridian at Greenwich. For scheduling purposes, they are interchangeable.
Estimate only. Results reflect your inputs and standard formulas. Double-check important decisions independently.