Most time synchronization needs are met by the UTC time scale broadcast by NIST radio stations WWV and WWVH. The Greenwich time standard was established in the 1840s and old habits die hard, so many people still refer to UTC as GMT. The show clock sync command can also be run on the standby RP, but the times displayed are relative to that RP.Space Today Online - Solar System Planet Earth - Angkor SPACE TODAY ONLINE C OVERING S PACE FROM E ARTH TO THE E DGE OF THE U NIVERSEĬoordinated Universal Time ( UTC) is the modern implementation of Greenwich Mean Time (GMT). If the command is run on the DSDRSC for a non-owner SDR, then the results are for the cards in that SDR. If the command is run on the primary RP for the owner SDR, then the results show the relative time settings for the cards assigned to the owner SDR. The show clock sync command shows the relative time difference between the RP where it is run and the cards in that SDR. If the time setting on the card is different from the time on the primary RP, the display shows if the clock on the card is being adjusted to synchronize with the primary RP. When this command is run, the primary RP queries the clocks on each card in the system and displays the time difference between each card and the primary RP. The show clock sync command verifies that the cards in the router are synchronized with the primary RP. This synchronization ensures that the standby RP has an accurate time setting if it assumes the primary role and that the events in logs between different RPs and LCs can be easily correlated during debugging. In a router running Cisco IOS XR software the time clock in the primary RP is synchronized with the other RPs, DRPs, and LCs in the system. Table 2 Single-Letter Time Zone Designators Using this method, the International Date Line is between time zones M and Y. Using this method, the letter Z is used to indicate the zero meridian, equivalent to UTC, and the letter J (Juliet) is used to refer to the local time zone. This table lists an alternative method for referring to time zones, in which single letters are used to refer to the time zone difference from UTC. Western Standard Time, as UTC plus 8 hours.Ĭentral Standard Time, as UTC plus 9.5 hours.Įastern Standard/Summer Time, as UTC plus 10 hours (plus 11 hours during summer time). Hawaiian Standard Time, as UTC minus 10 hours. Pacific Daylight Saving Time, as UTC minus 7 hours.Īlaska Standard Time, as UTC minus 9 hours.Īlaska Standard Daylight Saving Time, as UTC minus 8 hours. Pacific Standard Time, as UTC minus 8 hours. Pacific Time, either as PST or PDT, depending on place and time of year. Mountain Daylight Saving Time, as UTC minus 6 hours. Mountain Standard Time, as UTC minus 7 hours. Mountain Time, either as MST or MDT, depending on place and time of year. Western Europe Summer Time, as UTC plus 1 hour.Ĭentral Europe Summer Time, as UTC plus 2 hours.Įastern Europe Time, as UTC plus 2 hours.Įastern Europe Summer Time, as UTC plus 3 hours.Ītlantic Standard Time, as UTC minus 4 hours.Ītlantic Daylight Time, as UTC minus 3 hours.Įastern Time, either as EST or EDT, depending on place and time of year.Įastern Standard Time, as UTC minus 5 hours.Įastern Daylight Saving Time, as UTC minus 4 hours.Ĭentral Time, either as CST or CDT, depending on place and time of year.Ĭentral Standard Time, as UTC minus 6 hours.Ĭentral Daylight Saving Time, as UTC minus 5 hours. This table lists common time zone acronyms used for the zone argument. If the starting month is after the ending month, the system assumes that you are in the Southern Hemisphere. The start time is relative to standard time. All times are relative to the local time zone. In both forms of the command, the first part of the command specifies when summer time begins and the second part specifies when it ends. Use the date keyword to specify a start and end date for summer time if you cannot use the first form. The default for the offset argument is 60 minutes. If clock summer-time zone recurring is specified without parameters, the summer time rules default to United States standards. Use the recurring keyword to apply the rules on the configured day each year. Use the clock summer-time command if you want the system to switch automatically to summer time (for display only): If you suspect user group assignment is preventing you from using a command, contact your AAA administrator for assistance. To use this command, you must be in a user group associated with a task group that includes the proper task IDs.
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