Meeting Planner Time Zone Converter

Reviewed by the CalculatorHub team, edited by James Graham. Method from NIST Time and Frequency Division. Last verified 2026-06-23.

The Meeting Planner Time Zone Converter computes meeting planner time zone from the relation destination hour = (source hour + (destination UTC offset - source UTC offset)) mod 24. It takes 3 inputs (meeting hour in source zone 0 to 23 in h, source utc offset in h, destination utc offset in h) and returns the meeting planner time zone. Because this is a pure mathematical or physical formula rather than a jurisdiction-specific rule, the result never changes over time: the same inputs always produce the same answer, so you can rely on it whether you are checking homework, sizing a design, or sanity-checking another tool. Enter your values in the fields below and the result updates instantly; you can also share a permalink that pre-fills the exact calculation, which is useful for teaching, reports, or collaboration. For example, with meeting hour in source zone 0 to 23 = 9 h, source utc offset = 0 h, destination utc offset = 9 h, the meeting planner time zone works out to 18, and the worked example further down the page shows every step so you can follow the arithmetic and reproduce it by hand. The method is the standard form documented by NIST Time and Frequency Division, and the figure above each result carries the date it was last verified. This tool is general information and is not a substitute for professional engineering, medical, financial, or scientific advice; always check critical results against the primary source and your own judgement.