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The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software.
The time server may be a local network time server or an internet time server. The most important and widely used protocol for distributing and synchronising time over the Internet is the Network Time Protocol (NTP), though other less-popular or outdated time protocols continue in use. A variety of protocols are in common use for sending time ...
NTP uses a hierarchical, semi-layered system of time sources. Each level of this hierarchy is termed a stratum and is assigned a number starting with zero for the reference clock at the top. A server synchronized to a stratum n server runs at stratum n + 1. The number represents the distance from the reference clock and is used to prevent ...
In Hong Kong, Hong Kong Time is defined in the Interpretation and General Clauses Ordinance (Cap 1), Laws of Hong Kong.. Section 67(2) of the Ordinance states that: "Hong Kong Time" (香港時間) means the time used for general purposes throughout Hong Kong namely, 8 hours, or such other period as may be determined by the Legislative Council by resolution under this subsection or under ...
The more time servers there are in the pool, the lower the resource demand on each member. Joining the pool requires at least a broadband connection to the Internet, a static IP address, and accurate time from another source (for example, another NTP server, a DCF77 receiver, a WWVB receiver, or a GPS disciplined oscillator).
A host connects to a server that supports the Time Protocol on port 37. The server then sends the time as a 32-bit unsigned integer in binary format and in network byte order, representing the number of seconds since 00:00 (midnight) 1 January, 1900 GMT, and closes the connection. Operation over UDP requires the sending of any datagram to the ...
The National Time Service Center in Mount Li, Lintong, Xi'an, Shaanxi. In the 1870s, the Shanghai Xujiahui Observatory was constructed by a French Catholic missionary. In 1880s officials in Shanghai French Concession started to provide a time announcement service using the Shanghai Mean Solar Time provided by the aforementioned observatory for ships into and out of Shanghai.
The first widely known case of NTP server problems began in May 2003, when Netgear's hardware products flooded the University of Wisconsin–Madison's NTP server with requests. [5] University personnel initially assumed this was a malicious distributed denial of service attack and took actions to block the flood at their network border.