The time tag corresponding to23:59:59 is therefore ambiguous, since two consecutive seconds have that name. That is, they repeat the binary time equivalent of 23:59:59 twice, and the next second is second 0 of the following day. The NIST time servers add the extra leap second by stopping the clock for one second at 23:59:59. The name of a positive leap second is 23:59:60, but digital time formats, which represent the current time as the number of seconds that have elapsed since some origin (NTP, for example), cannot represent that time. The Internet Time Service and Leap Secondsįor more detailed information about leap seconds, see Leap Seconds FAQs. There are some steps you may have to take when accessing the NIST Internet Time Service through a firewall. Here are the server names, locations, and IP addresses and current status. Other sources of time are not monitored or certified by NIST. NIST operates several stratum-1 network time servers, which means their time is directly linked to UTC(NIST), the official NIST time. ![]() This option is different on different versions of the operating system, and you should consult the help messages for the version that you are using. In the settings, you may be allowed to pick which NTP server the time comes from. Mac: Applications > System Preferences > Date & Time I don’t have a mac. You cannot select the time server in the newer versions of Windows. Your system will contact a time server and adjust the system clock, if needed. Windows: Right-click the system clock in the lower right-hand corner of the display and click on the “sync now” button. If you have administrator (or “root”) privileges, you may also set the clock manually at any time, although this is generally not necessary. The process generally does not require any manual intervention. This synchronization process normally starts automatically when the system is bootstrapped and runs in the background. Most operating systems, such as Windows, MacOS, and Linux have an option to automatically synchronize the system clock periodically by sending queries to an NTP (network time protocol) server. You may also get client software and documentation for many operating systems from the Network Time Foundation at Manually setting the system clock: There are a number of third-party programs that can access this site from a Windows system. The FTP client software in some versions of Microsoft Windows cannot connect to this public site. When you connect to this site, you should use the username “anonymous” and your email address as the password. It supports a number of different options, and has extensive help messages for each option. ![]() It is a ready-to-run client for most versions of Windows. The file nistime-32bit.exe can be downloaded from this site. All of the public files on the time servers, including example source code for programmers who want to write their own applications and ready-to-run applications for some common operating systems, have been moved to this public ftp site: /pub/time. We are phasing out the ftp access to the time servers. NIST has established a mailing list (Google Group) to inform users of status changes of the Internet Time Service. If you wish to subscribe to this list, please send your name and email address to: internet-time-service (subject: Subscribe%20to%20ITS%20mailing%20list) Set your computer clock via the Internet using tools built into the operating system
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