World Time Zone Converter & Calculator - Convert Time Instantly
Easily calculate and convert date time between any two world time zones. Compare PST to EST, convert UTC to local time, or check IST to EST time differences — this free online time zone calculator provides instant and accurate results.
Time Input
Choose your input method and source time zone
Timestamps are based on UTC time; no source timezone selection needed
Conversion Results
View converted time across multiple time zones
Best Meeting Time Finder
Analyze all time zones to find the best time slots for meetings or calls
📅 Note: This schedule shows typical weekday working hours. Weekend availability may differ.
Popular Time Zone Conversions
Quick access to the most commonly used timezone conversions
The World Time Zone Converter & Calculator makes it simple to check the current time and calculate time differences across 100+ world time zones. Whether you're comparing UTC to EST, PST to JST, or adjusting for Daylight Saving Time (DST), this tool provides accurate conversions instantly. Just select your locations and see the exact time difference, updated in real time.
Perfect for travelers, remote teams, and anyone working across borders, our time zone converter helps you plan meetings, manage global schedules, and avoid confusion about local times. With built-in UTC offset detection and support for daylight changes, it ensures you always stay on time — wherever you are in the world.
How to Use
- Input time: Select date, time, and source time zone; the system will automatically convert to other time zones.
- Current time: Click the 'Use Current Time' button to quickly fill in the current time.
- Add time zone: Click 'Add Time Zone' to add a custom time zone.
- Copy time: Click the copy button to copy the converted time.
- Real-time updates: Each time zone card displays the current time in real time.
Features
Time Zone Knowledge
What Is a Time Zone?
A time zone is a region on Earth that observes the same standard time. The globe is divided into 24 time zones, each differing by one hour.
UTC (Coordinated Universal Time)
UTC (Coordinated Universal Time) is the global standard time and serves as the reference for all other time zones. Other time zones are defined as offsets from UTC.
Daylight Saving Time (DST)
Some countries and regions advance their clocks by one hour during summer to make better use of daylight—this is known as Daylight Saving Time. Our tool automatically handles DST transitions.
Common Time Zone Abbreviations
- CST：CST: China Standard Time (UTC+8)
- JST：JST: Japan Standard Time (UTC+9)
- EST/EDT：EST/EDT: Eastern Time (UTC-5/-4)
- PST/PDT：PST/PDT: Pacific Time (UTC-8/-7)
- GMT：GMT: Greenwich Mean Time (UTC+0)
Supported Time Zones Worldwide
Convert time across 100+ global time zones, organized by region.
Popular Time Zones (Most Used)
UTC 1 time zones
Asia 22 time zones
Europe 25 time zones
North America 13 time zones
South America 6 time zones
Oceania 6 time zones
Africa 6 time zones
Frequently Asked Questions
A time zone converter is a tool that helps you calculate the current time and time differences between two or more locations around the world. It automatically adjusts for UTC offsets and Daylight Saving Time (DST) to ensure accurate results.
Simply choose two cities or countries from the dropdown menus, and the calculator will instantly display the current local time and time difference between them. You can also switch directions or add more time zones for comparison.
Yes. The converter is perfect for scheduling international meetings, flights, or virtual events. It helps remote teams and global travelers coordinate across multiple time zones without confusion.
Absolutely. The converter automatically detects and adjusts for DST changes, so you'll always get the correct time difference even when countries switch between standard and daylight time.
Our tool includes over 100 world time zones — from UTC, EST, PST, and IST to less common ones like AEST and CAT — so you can convert time accurately anywhere in the world.
PST (Pacific Standard Time) is UTC-8, while EST (Eastern Standard Time) is UTC-5. EST is 3 hours ahead of PST.
Programming Time Zone Conversion
Below are examples of time zone conversion implementations in various programming languages:
JavaScript
// Using Intl.DateTimeFormat for time zone conversion
const date = new Date('2024-01-01 12:00:00');
const options = {
timeZone: 'America/New_York',
year: 'numeric',
month: '2-digit',
day: '2-digit',
hour: '2-digit',
minute: '2-digit',
second: '2-digit'
};
const nyTime = new Intl.DateTimeFormat('en-US', options).format(date);
console.log(nyTime);Python
# Using the pytz library for time zone conversion
from datetime import datetime
import pytz
beijing_tz = pytz.timezone('Asia/Shanghai')
ny_tz = pytz.timezone('America/New_York')
beijing_time = beijing_tz.localize(datetime(2024, 1, 1, 12, 0, 0))
ny_time = beijing_time.astimezone(ny_tz)
print(ny_time)Java
import java.time.*;
import java.time.format.DateTimeFormatter;
LocalDateTime localTime = LocalDateTime.of(2024, 1, 1, 12, 0, 0);
ZonedDateTime beijingTime = localTime.atZone(ZoneId.of("Asia/Shanghai"));
ZonedDateTime nyTime = beijingTime.withZoneSameInstant(ZoneId.of("America/New_York"));
System.out.println(nyTime.format(DateTimeFormatter.ISO_LOCAL_DATE_TIME));Rust
use chrono::{DateTime, TimeZone, Utc};
use chrono_tz::{Asia::Shanghai, America::New_York};
fn main() {
let beijing_time = Shanghai.ymd(2024, 1, 1).and_hms(12, 0, 0);
let utc_time: DateTime<Utc> = beijing_time.with_timezone(&Utc);
let ny_time = utc_time.with_timezone(&New_York);
println!("{}", ny_time.format("%Y-%m-%d %H:%M:%S"));
}About This Tool
Our World Time Zone Converter & Calculator is designed to make global scheduling simple. Whether you're connecting with friends overseas, managing international meetings, or just curious about the time in another country, this tool helps you find accurate local times instantly — no confusion, no math, just clarity across time zones.