| Time, Time protocol |
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Description | Glossary | RFCs | Publications | Obsolete RFCs |
| Protocol suite: | TCP/IP. |
| Protocol type: | Application layer time protocol. |
| Ports: | 37 (TCP, UDP). |
| SNMP MIBs: | |
| Working groups: | |
| Links: |
This protocol provides a site-independent, machine readable date and time. The Time service sends back to the originating source the time in seconds since midnight on January first 1900.
A time request is initiated by connecting to the Time service via TCP or by sending an empty UDP datagram to the Time service.
The reply from the Time service consists of a single 32 bit value.
| MAC header | IP header | TCP | UDP header | Time message |
Time message:
| 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Time. | |||||||||||||||||||||||||||||||
Time.
32 bits, unsigned.
The number of seconds since 00:00 (midnight) 1 January 1900 GMT, such that the
time 1 is 12:00:01 am on 1 January 1900 GMT; this base will serve until the year 2036.
RFCs:
[IEN 142] Time Server.
[RFC 738] Time Server.
[RFC 868] Time Protocol.
[RFC 956] Algorithms for Synchronizing Network Clocks.
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Description | Glossary | RFCs | Publications | Obsolete RFCs |