COHERENT manpages
This page displays the COHERENT manpage for ATclock [Read or set the AT realtime clock].
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ATclock -- Command Read or set the AT realtime clock /etc/ATclock [yy[mm[dd[hh[mm[.ss]]]]]] ATclock reads or sets your system's ``hardware'' time, which is stored in your system's CMOS. This clock should contain the current standard time for your locale. With no argument, the command ATclock reads the hardware clock and returns a string in the format expected by the command date. With an argument, it sets the hardware clock to the given date. For example, to set your hardware clock to October 24, 1994, at 9:30 PM, use the command: /etc/ATclock 9410242130 ATclock also lets you reset the time incrementally: that is, you can reset only the year; the year and month; the year, month, and day; and so on down to the second. Note that if you use ATclock to reset your hardware clock, you must reset it to the standard time in your locale, even if daylight-savings time happens to be in effect when you reset the clock. If you do not, COHERENT's commands that set the local time on your system (e.g., the command date) will be off by one hour when daylight-savings time is in effect. The system startup file /etc/brc typically contains a command of the form date -s `/etc/ATclock` to reset the time properly when the COHERENT system starts up. See Also brc, clock, CMOS, commands, date