Time zone converter

Calculate time zone converter with clear inputs and assumptions.

Your dates and times stay in your browser and are not stored.

Method and assumptions

Method version 1.0.0 · Updated October 17, 2026

Calculate

Formula: Calculate time zone converter with clear inputs and assumptions.

Calculate time zone converter with clear inputs and assumptions.

date: Date with time zone
fromZone: Source time zone (IANA)
toZone: Target time zone (IANA)

Results are estimates where noted and depend on the entered assumptions.

Calculate with code

These short examples use the same inputs and core calculation as this tool. Adapt validation and formatting to your application.

JavaScript

const instant = new Date("2026-01-01T12:00:00Z");
console.log(new Intl.DateTimeFormat("en", {timeZone:"America/New_York", hour:"2-digit", minute:"2-digit"}).format(instant)); // 07:00 (winter)

TypeScript

const instant = new Date("2026-01-01T12:00:00Z");
const local: string = new Intl.DateTimeFormat("en", {timeZone:"America/New_York", hour:"2-digit", minute:"2-digit"}).format(instant);
console.log(local); // 07:00

Python

from datetime import datetime
from zoneinfo import ZoneInfo
print(datetime(2026,1,1,12,tzinfo=ZoneInfo("UTC")).astimezone(ZoneInfo("America/New_York")))

Java

var instant = java.time.Instant.parse("2026-01-01T12:00:00Z");
System.out.println(instant.atZone(java.time.ZoneId.of("America/New_York")));

var instant = DateTimeOffset.Parse("2026-01-01T12:00:00Z");
var zone = TimeZoneInfo.FindSystemTimeZoneById("America/New_York");
Console.WriteLine(TimeZoneInfo.ConvertTime(instant, zone));