{
    "mode": "man",
    "parameter": "adjtime_config",
    "section": "5",
    "url": "https://www.chedong.com/phpMan.php/man/adjtime_config/5/json",
    "generated": "2026-05-30T07:10:11Z",
    "synopsis": "/etc/adjtime",
    "sections": {
        "NAME": {
            "content": "adjtimeconfig - information about hardware clock setting and drift factor\n",
            "subsections": []
        },
        "SYNOPSIS": {
            "content": "/etc/adjtime\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "The file /etc/adjtime contains descriptive information about the hardware mode clock setting\nand clock drift factor. The file is read and write by hwclock(8); and read by programs like\nrtcwake to get RTC time mode.\n\nThe file is usually located in /etc, but tools like hwclock(8) or rtcwake(8) can use\nalternative location by command line options if write access to /etc is unwanted. The default\nclock mode is \"UTC\" if the file is missing.\n\nThe Hardware Clock is usually not very accurate. However, much of its inaccuracy is\ncompletely predictable - it gains or loses the same amount of time every day. This is called\nsystematic drift. The util hwclock(8) keeps the file /etc/adjtime, that keeps some historical\ninformation. For more details see \"The Adjust Function\" and \"The Adjtime File\" sections from\nhwclock(8) man page.\n\nThe format of the adjtime file is, in ASCII.\n",
            "subsections": [
                {
                    "name": "First line",
                    "content": "Three numbers, separated by blanks:\n"
                },
                {
                    "name": "drift factor",
                    "content": "the systematic drift rate in seconds per day (floating point decimal)\n"
                },
                {
                    "name": "last adjust time",
                    "content": "the resulting number of seconds since 1969 UTC of most recent adjustment or calibration\n(decimal integer)\n"
                },
                {
                    "name": "adjustment status",
                    "content": "zero (for compatibility with clock(8)) as a floating point decimal\n"
                },
                {
                    "name": "Second line",
                    "content": ""
                },
                {
                    "name": "last calibration time",
                    "content": "The resulting number of seconds since 1969 UTC of most recent calibration. Zero if there\nhas been no calibration yet or it is known that any previous calibration is moot (for\nexample, because the Hardware Clock has been found, since that calibration, not to\ncontain a valid time). This is a decimal integer.\n"
                },
                {
                    "name": "Third line",
                    "content": ""
                },
                {
                    "name": "clock mode",
                    "content": "Supported values are UTC or LOCAL. Tells whether the Hardware Clock is set to Coordinated\nUniversal Time or local time. You can always override this value with options on the\nhwclock(8) command line.\n"
                }
            ]
        },
        "FILES": {
            "content": "/etc/adjtime\n",
            "subsections": []
        },
        "SEE ALSO": {
            "content": "hwclock(8), rtcwake(8)\n",
            "subsections": []
        },
        "REPORTING BUGS": {
            "content": "For bug reports, use the issue tracker at https://github.com/karelzak/util-linux/issues.\n",
            "subsections": []
        },
        "AVAILABILITY": {
            "content": "adjtimeconfig is part of the util-linux package which can be downloaded from Linux Kernel\nArchive <https://www.kernel.org/pub/linux/utils/util-linux/>.\n\n\n\nutil-linux 2.37.2                            2021-06-02                            ADJTIMECONFIG(5)",
            "subsections": []
        }
    },
    "summary": "adjtimeconfig - information about hardware clock setting and drift factor",
    "flags": [],
    "examples": [],
    "see_also": [
        {
            "name": "hwclock",
            "section": "8",
            "url": "https://www.chedong.com/phpMan.php/man/hwclock/8/json"
        },
        {
            "name": "rtcwake",
            "section": "8",
            "url": "https://www.chedong.com/phpMan.php/man/rtcwake/8/json"
        }
    ]
}