JST to UTC Converter

Category: Time Zone Converters
- June 19, 2025
| |

Japan Standard Time (JST)

UTC+9 • Tokyo, Yokohama, Osaka, Nagoya

Conversion Settings

Configure your timezone conversion preferences

Coordinated Universal Time (UTC)

UTC+0 • Greenwich Mean Time, Zulu Time
--:--:--
Select a time to convert
Time Difference: --
UTC Offset (JST): +9:00
UTC Offset (UTC): +0:00
DST Status: --
JST Time: --
UTC Time: --
Time Format:
Current JST: --:--:--
Current UTC: --:--:--
🇯🇵 JST is always UTC+9 and never observes daylight saving time. UTC is the world's primary time standard.

JST to UTC Conversion Guide

What is JST to UTC Conversion?

JST to UTC conversion helps you translate time between Japan Standard Time and Coordinated Universal Time zones. JST is always UTC+9 and never changes for daylight saving time, making it one of the most stable time zones. UTC is the world's primary time standard and reference point for all other time zones.

Time Zone Information

Japan Standard Time (JST): Used throughout Japan including Tokyo, Yokohama, Osaka, and all Japanese cities. Always UTC+9 with no daylight saving time.
Coordinated Universal Time (UTC): The world's primary time standard, also known as Greenwich Mean Time (GMT) or Zulu time. Always UTC+0 with no changes.
Time Difference: JST is always 9 hours ahead of UTC throughout the entire year with no exceptions.

Daylight Saving Time Impact

Japan Standard Time: Never observes daylight saving time - always UTC+9 year-round
UTC Time: Never changes - always UTC+0 and serves as the global reference
Consistency: Both time zones remain constant, making conversion simple and reliable

Common Conversion Examples

Business Hours
JST 9:00 AM → UTC 12:00 AM
JST 6:00 PM → UTC 9:00 AM
Constant 9-hour time difference
Evening Times
JST 7:00 PM → UTC 10:00 AM
JST 11:00 PM → UTC 2:00 PM
JST evening becomes UTC morning/afternoon
Meeting Planning
Best JST Time: 5:00 PM - 7:00 PM
Converts to UTC: 8:00 AM - 10:00 AM
Perfect for international coordination
Event Scheduling
JST Midnight: 3:00 PM UTC (previous day)
JST Noon: 3:00 AM UTC
Note the date changes across conversion

Conversion Tips & Best Practices

• To convert JST to UTC, subtract 9 hours from JST time
• JST never changes - it's always exactly 9 hours ahead of UTC year-round
• Japan does not observe daylight saving time, making conversions consistent
• Best meeting times: JST evening (5-7 PM) = UTC morning (8-10 AM)
• When converting JST morning times, result is often the previous day in UTC
• Use 24-hour format to avoid AM/PM confusion in international scheduling

Convert Between JST and UTC

What this time tool actually does

If you've ever found yourself unsure about what time it is in Japan compared to UTC, this calculator makes it simple. You choose a date and time in either Japan Standard Time (JST) or Coordinated Universal Time (UTC), and it gives you the accurate equivalent in the other. Whether you're scheduling a meeting, booking an event, or just trying to avoid a missed call, it's a quick way to be sure you're in sync.

Why this might come in handy

JST never changes - it's always 9 hours ahead of UTC. But your local time probably does change for daylight saving, and that’s where this tool earns its keep. It helps you:

  • Coordinate across time zones without mental math
  • Know if a JST morning means a UTC late night (or yesterday)
  • Plan ahead for international video calls or travel

Here’s how to use it

Step-by-step instructions

  1. Pick your time zone: Use the dropdown near the top to set whether you're entering a JST or UTC time.
  2. Set the date and time: Choose the date and time you want to convert.
  3. Click “Convert Time”: That’s it. The tool does the math and shows the converted time immediately.

Need to flip the conversion?

Just click the “Swap” button. It flips your input and output time zones, so if you started with JST, you'll now be entering a UTC time and seeing the result in JST. This is handy if someone in Tokyo sent you a calendar invite and you want to know when it hits your schedule.

Want the current time?

Click the “Now” button. It fills in the current time in the selected time zone, so you can instantly see what that moment looks like on the other side of the planet.

Options that give you more control

Auto Convert

When turned on, the tool converts as soon as you change the time or date - no need to press anything. Great for fast comparisons.

Daylight Saving Aware

This is checked by default, but doesn’t really affect JST or UTC since neither one changes for daylight saving. It's there to make the system adaptable if you use it with other time zones later.

Show UTC Offset

When enabled, this adds the UTC offset to the display (like “+9:00” for JST). It’s a small detail that makes a big difference when you’re comparing multiple time zones.

12-Hour vs 24-Hour Format

Prefer AM/PM or want to keep things military-style? Click the “12 Hour” button to toggle between formats. The display updates immediately, including the live clocks.

Answers to questions you might have

What if I enter an early morning JST time?

You might see a date shift in UTC. For example, JST 1:00 AM on June 5 converts to UTC 4:00 PM on June 4. That kind of shift matters if you're dealing with flights, deadlines, or international news cycles.

Does this support daylight saving time?

Sort of. JST doesn’t use it, and UTC doesn’t either. But if this tool gets updated to support more time zones in the future, the checkbox is already in place to handle daylight saving automatically.

Can I use keyboard shortcuts?

Yes! If you're on a keyboard, you can:

  • Press N to set the time to “Now”
  • Press S to swap time zones
  • Press R to reset everything
  • Press F to toggle between 12-hour and 24-hour format
  • Press Space or Enter to convert the time

These work as long as you're not typing in a field.

A small tool that keeps your timing solid

Whether you’re juggling meetings across continents or just curious what time it is in Tokyo, this calculator makes it easy to stay in sync. With consistent time zones like JST and UTC, once you’ve used this tool a few times, you’ll start to spot patterns. Until then, it’s right here when you need it.

Time now in these cities:

New York · London · Tokyo · Paris · Hong Kong · Singapore · Dubai · Los Angeles · Shanghai · Beijing · Sydney · Mumbai

Time now in countries:

🇺🇸 USA | 🇨🇳 China | 🇮🇳 India | 🇬🇧 United Kingdom | 🇩🇪 Germany | 🇯🇵 Japan | 🇫🇷 France | 🇨🇦 Canada | 🇦🇺 Australia | 🇧🇷 Brazil |

Time now in time zones:

UTC | GMT | CET | PST | MST | CST | EST | EET | IST | China (CST) | JST | AEST | SAST | MSK | NZST |

Free widgets for webmasters:

Free Analog Clock Widget | Free Digital Clock Widget | Free Text Clock Widget | Free Word Clock Widget