the system call time(2) to determine seconds since the Epoch ( 00:00:00 UTC, January 1, 1970). Every application like the user space tool will first use e.g. To understand why local time in CMOS clock may cause problems it helps to know which clock is used as reference by the Linux kernel and how the user space tools access this clock. Coordinated Universal Time is based on a 24 hour clock therefore, afternoon hours such as 4 pm UTC are expressed as 16:00 UTC. Zero hours UTC is midnight in Greenwich, England, which lies on the zero longitudinal meridian. It is the current term for what was commonly referred to as Greenwich Meridian Time (GMT). UTC (Coordinated Universal Time) is the international time standard. The safest way is to set the CMOS clock to UTC before beginning the installation process. This way Linux can keep the user space clock on the correct time when the change for Daylight Saving Time occurs. It is recommend that the system clock (as well as the CMOS/BIOS clock) is set to UTC/GMT. At this time most users will intentionally choose local time as shown e.g. At boot the file systems may be checked without any apparent reason.ĭuring installation of a Linux system most users will be asked about the time to use for the CMOS/BIOS clock. Sometimes the time stamps shown for some files are wrong, that is back in history or forward into the future. with the date command is wrong after reboot. Send any comments or questions to: refer to our for our web clock/map and our Time and Frequency Division FAQ with questions about time zones, daylight saving time, atomic clocks, etc.The clock shown e.g. We do not have a widget/gadget application for your desktop. This is a web page with just the widget: The widget can no longer be embedded into other web pages. The time shown estimates that one-half of the round-trip delay is the delay from the time server to the browser. When the time is displayed in the browser. The widget utilizes the client's computer clock as a timer to measure the round-trip network delay, which is the interval of time starting when the widget sends a time request to the server and ending It should not be used to make measurements, nor should it be used to establish traceability to NIST. Therefore, this widget is intended as a time-of-day service only. So the running clock comes from the internal oscillator of the local computer. The widget is not continuously linked to NIST, it re-synchronizes with NIST every 10 minutes. The widget adjusts the display to show the local time based on the client's computer time zone settings as the default. The time reference for the widget is the output of the national time scale called UTC(NIST), which disseminates Coordinated Universal Time UTC(NIST). It is a web clock showing the official time of day from NIST, displayed as a 12 or 24-hour clock, in a user-selectable time zone. This widget is a public service provided by the Time and Frequency Division of the National Institute of Standards and Technology (NIST).
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