Information
- The URL of Japan Standard Time in large letters has been changed, so please be careful when you use it.
The new URL is as follows.
https://www.nict.go.jp/JST/JST6_E/ (2024/4/22) - No leap second will be introduced on July 1, 2025. (2025/1/8)
（No leap second was introduced on January 1, 2025.） - The Time Dissemination by Telephone (TEL-JJY) ended on March 31, 2024. (2024/4/1)
- As previously announced, we have completed updating the servers used for public NTP services, so all public NTP servers no longer support NTP version 1. Therefore, if you are using NTP version 1, please migrate to NTP version 2 or later. (2024/3/14)
- "Telephone JJY" will be completely replaced with "Hikari Telephone JJY" on April 1, 2024. (2024/1/4)
- Japan standard time distribution service over analog telephone lines (Telephone JJY) ends March 31, 2024. (2023/3/15)
Topics
LF Standard Time and Frequency Transmission Station
- Transmission Information of JJY signals (Japanese version only)
- Operation Information of LF stations (Japanese version only)
Contents
Welcome to Japan Standard Time (JST) Group. JST Group plays an important role in the Generation, Comparison, and Dissemination of Japan Standard Time and Frequency standard. Please choose the contents you'd like to use.
Contact Us
Please contact us if you have any questions, comments, corrections, or suggestions.