Why time zone conversions need a date
Use a city zone and the actual date for a meeting. A fixed offset such as UTC−05:00 does not change for daylight saving time; a city zone can.
Separate an offset from a place
An offset says how far a clock is from UTC. A city zone supplies the rules for a place at the selected date. If you mean New York local time, choose America/New_York rather than assuming one offset applies all year.
Abbreviations can name more than one zone. The converter asks for a city or full IANA identifier to make the location explicit. On the India pair pages, IST means India Standard Time; it does not stand for another place using the same abbreviation.
Some clock readings are skipped or repeated
When a local clock jumps forward, a time inside the gap has no matching instant. The converter rejects it. When the clock moves back, a repeated reading can match two instants; use Repeated clock hour to select the occurrence.
Changing only the displayed hour without keeping the date can lose a day when the other place is across midnight. Copy the converted date as well as the time.
Check future meetings again
The converter uses the time-zone rules supplied by your browser. Government changes can reach older devices late. Keep the browser and operating system updated, and check the actual appointment date again before relying on a future conversion.