{"id":1086,"date":"2026-06-25T11:40:00","date_gmt":"2026-06-25T08:40:00","guid":{"rendered":"https:\/\/itgen.itbumper.com\/?page_id=1086"},"modified":"2026-06-25T12:17:22","modified_gmt":"2026-06-25T09:17:22","slug":"chrony-manual-time-date-configuration-ntp-offline","status":"publish","type":"page","link":"https:\/\/itgen.itbumper.com\/?page_id=1086","title":{"rendered":"Chrony | Manual Time & Date Configuration (NTP Offline)"},"content":{"rendered":"
Chrony<\/h6>\n\n
\ntimedatectl status\n\napt install chrony\nsystemctl status chrony\nsystemctl restart chrony\n<\/pre><\/div>\n\n
Configuration file – \/etc\/chrony\/chrony.conf<\/strong><\/p>\n\n
\n# Use Debian vendor zone.\npool 2.debian.pool.ntp.org iburst\n\n# # # #  # You can set a certain server # # # # # \n#server 0.ru.pool.ntp.org iburst\n#server 1.ru.pool.ntp.org iburst\n\n# Allow access from a specific subnet\n#allow 192.168.1.0\/24\n\n# Serve time even without internet access (Stratum 10)\nlocal stratum 10\n\n# # # # # # # # # # # # # # # # # # # # # # # # #\n\n# Use time sources from DHCP.\n#sourcedir \/run\/chrony-dhcp\n\n# Use NTP sources found in \/etc\/chrony\/sources.d.\nsourcedir \/etc\/chrony\/sources.d\n\n# This directive specifies the location of the file containing ID\/key pairs for\n# NTP authentication.\nkeyfile \/etc\/chrony\/chrony.keys\n\n# This directive specifies the file into which chronyd will store the rate\n# information.\ndriftfile \/var\/lib\/chrony\/chrony.drift\n\n# Save NTS keys and cookies.\nntsdumpdir \/var\/lib\/chrony\n\n# Uncomment the following line to turn logging on.\n#log tracking measurements statistics\n\n# Log files location.\nlogdir \/var\/log\/chrony\n\n# Stop bad estimates upsetting machine clock.\nmaxupdateskew 100.0\n\n# This directive enables kernel synchronisation (every 11 minutes) of the\n# real-time clock. Note that it can't be used along with the 'rtcfile' directive.\nrtcsync\n\n# Step the system clock instead of slewing it if the adjustment is larger than\n# one second, but only in the first three clock updates.\nmakestep 1 3\n\n# Get TAI-UTC offset and leap seconds from the system tz database.\n# This directive must be commented out when using time sources serving\n# leap-smeared time.\nleapseclist \/usr\/share\/zoneinfo\/leap-seconds.list\n\n# Include configuration files found in \/etc\/chrony\/conf.d.\nconfdir \/etc\/chrony\/conf.d\n\n<\/pre><\/div>\n\n
Most Frequently Used Commands<\/h6>\n
    \n
  • chronyc tracking<\/code><\/strong><\/span>\n
      \n
    • Purpose:<\/em> Check if the system clock is synchronized, see the current time error (offset), and system leap status.<\/span><\/li>\n
    • \u041a\u043e\u0433\u0434\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c:<\/em> \u0421\u0430\u043c\u0430\u044f \u043f\u0435\u0440\u0432\u0430\u044f \u043a\u043e\u043c\u0430\u043d\u0434\u0430 \u0434\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u2014 \u0438\u0434\u0443\u0442 \u043b\u0438 \u0447\u0430\u0441\u044b \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e \u0438 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043e \u043b\u0438 \u0432\u0440\u0435\u043c\u044f \u043f\u0440\u044f\u043c\u043e \u0441\u0435\u0439\u0447\u0430\u0441.<\/span><\/li>\n
      <\/p><\/ul>\n
      <\/p><\/li>\n
    • chronyc sources -v<\/code><\/strong><\/span>\n
        \n
      • Purpose:<\/em> List all time servers with their current connection status, stratum levels, and measurement metrics.<\/span><\/li>\n
      • \u041a\u043e\u0433\u0434\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c:<\/em> \u041f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c, \u0434\u043e \u043a\u0430\u043a\u0438\u0445 \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 chrony<\/code> \u0441\u043c\u043e\u0433 \u0434\u043e\u0441\u0442\u0443\u0447\u0430\u0442\u044c\u0441\u044f \u043f\u043e \u0441\u0435\u0442\u0438, \u0430 \u043a\u0430\u043a\u0438\u0435 \u043b\u0435\u0436\u0430\u0442 \u0438\u043b\u0438 \u0437\u0430\u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u044b.<\/span><\/li>\n
        <\/p><\/ul>\n
        <\/p><\/li>\n
      • chronyc sourcestats -v<\/code><\/strong><\/span>\n
          \n
        • Purpose:<\/em> Show stability and frequency drift statistics for each configured time source.<\/span><\/li>\n
        • \u041a\u043e\u0433\u0434\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c:<\/em> \u041f\u043e\u043d\u044f\u0442\u044c, \u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0439 \u0438 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0439 \u0441\u0435\u0440\u0432\u0435\u0440 \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u0432\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0435 (\u0432\u044b\u0441\u043e\u043a\u0438\u0439 \u0434\u0440\u0435\u0439\u0444 \u0447\u0430\u0441\u0442\u043e\u0442\u044b \u0433\u043e\u0432\u043e\u0440\u0438\u0442 \u043e \u043f\u043b\u043e\u0445\u043e\u0439 \u0441\u0432\u044f\u0437\u0438).<\/span><\/li>\n
          <\/p><\/ul>\n
          <\/p><\/li>\n
        • sudo chronyc makestep<\/code><\/strong><\/span>\n
            \n
          • Purpose:<\/em> Force an immediate time synchronization by stepping the system clock, ignoring the configured safe limits.<\/span><\/li>\n
          • \u041a\u043e\u0433\u0434\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c:<\/em> \u041a\u043e\u0433\u0434\u0430 \u0432\u0440\u0435\u043c\u044f \u0441\u0438\u043b\u044c\u043d\u043e \u0441\u0431\u0438\u043b\u043e\u0441\u044c (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043f\u043e\u0441\u043b\u0435 \u043f\u0435\u0440\u0435\u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u0438\u043b\u0438 \u043f\u0440\u043e\u0441\u0442\u043e\u044f \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u043a\u0438) \u0438 \u043d\u0443\u0436\u043d\u043e \u0432\u044b\u0440\u043e\u0432\u043d\u044f\u0442\u044c \u0435\u0433\u043e \u043f\u0440\u044f\u043c\u043e \u0441\u0435\u0439\u0447\u0430\u0441, \u043d\u0435 \u0434\u043e\u0436\u0438\u0434\u0430\u044f\u0441\u044c \u043f\u043b\u0430\u0432\u043d\u043e\u0439 \u043f\u043e\u0434\u0433\u043e\u043d\u043a\u0438.<\/span><\/li>\n
            <\/p><\/ul>\n
            <\/p><\/li>\n
          • chronyc clients<\/code><\/strong><\/span>\n
              \n
            • Purpose:<\/em> Display a report of all client machines (IP addresses) that are currently synchronized with this server.<\/span><\/li>\n
            • \u041a\u043e\u0433\u0434\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c:<\/em> \u041a\u043e\u0433\u0434\u0430 \u0432\u0430\u0448 \u0441\u0435\u0440\u0432\u0435\u0440 \u0441\u0430\u043c \u0440\u0430\u0437\u0434\u0430\u0435\u0442 \u0432\u0440\u0435\u043c\u044f \u0432 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0439 \u0441\u0435\u0442\u0438, \u0438 \u0432\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c, \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0438\u043b\u0438\u0441\u044c \u043b\u0438 \u043a \u043d\u0435\u043c\u0443 \u0440\u0430\u0431\u043e\u0447\u0438\u0435 \u0441\u0442\u0430\u043d\u0446\u0438\u0438 \u0438 Windows-\u043a\u043b\u0438\u0435\u043d\u0442\u044b.<\/span><\/li>\n
              <\/p><\/ul>\n
              <\/p><\/li>\n
            • chronyc ntsdata<\/code><\/strong><\/span>\n
                \n
              • Purpose:<\/em> Check the status of Network Time Security (NTS) connections, including established keys and cookies.<\/span><\/li>\n
              • \u041a\u043e\u0433\u0434\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c:<\/em> \u041f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c, \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u043b\u0438 \u0441\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0435 \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u0441 \u0432\u043d\u0435\u0448\u043d\u0438\u043c\u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u043c\u0438 (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, Cloudflare\/Netnod).<\/span><\/li>\n
                <\/p><\/ul>\n
                <\/p><\/li>\n
                <\/p><\/ul>\n
                <\/div>\n
                 <\/div>\n
                System Clock & Verification<\/h6>\n
                  \n
                • chronyc tracking<\/code><\/strong> \u2014 Displays system time accuracy, error rate, and current offset.<\/span><\/li>\n
                • chronyc sources -v<\/code><\/strong> \u2014 Shows detailed status and connectivity of all time sources.<\/span><\/li>\n
                • chronyc sourcestats -v<\/code><\/strong> \u2014 Displays drift rate and stability stats for each source.<\/span><\/li>\n
                • chronyc ntsdata<\/code><\/strong> \u2014 Shows active Network Time Security (NTS) session status.<\/span><\/li>\n
                • chronyc makestep<\/code><\/strong> \u2014 Forces an immediate clock correction by stepping the time.<\/span><\/li>\n
                  <\/p><\/ul>\n
                  <\/div>\n
                  NTP Source Management<\/h6>\n
                    \n
                  • chronyc activity<\/code><\/strong> \u2014 Reports how many NTP sources are currently online or offline.<\/span><\/li>\n
                  • chronyc ntpdata <IP><\/code><\/strong> \u2014 Displays detailed statistics of the last measurement from a specific server.<\/span><\/li>\n
                  • sudo chronyc add server <Name> [options]<\/code><\/strong> \u2014 Adds a new NTP server dynamically on the fly.<\/span><\/li>\n
                  • sudo chronyc delete <IP><\/code><\/strong> \u2014 Removes an NTP server or peer from the active polling list.<\/span><\/li>\n
                  • sudo chronyc refresh<\/code><\/strong> \u2014 Refreshes IP addresses of sources defined by domain names.<\/span><\/li>\n
                  • sudo chronyc reload sources<\/code><\/strong> \u2014 Forces chrony to re-read modern *.sources<\/code> configuration files.<\/span><\/li>\n
                    <\/p><\/ul>\n
                    <\/div>\n
                    Server & Client Control<\/h6>\n
                      \n
                    • sudo chronyc allow <Subnet><\/code><\/strong> \u2014 Permits a specific subnet to query this server for time.<\/span><\/li>\n
                    • sudo chronyc deny <Subnet><\/code><\/strong> \u2014 Blocks a specific subnet from accessing this time server.<\/span><\/li>\n
                    • chronyc clients<\/code><\/strong> \u2014 Generates a report of all clients that have accessed this NTP server.<\/span><\/li>\n
                    • chronyc serverstats<\/code><\/strong> \u2014 Shows packet statistics for the time server operation.<\/span><\/li>\n
                      <\/p><\/ul>\n
                      <\/div>\n
                      Security & Keys<\/h6>\n
                        \n
                      • chronyc authdata<\/code><\/strong> \u2014 Displays authentication information (KeyID and NTS state) for sources.<\/span><\/li>\n
                      • sudo chronyc keygen <ID> <Type> <Bits><\/code><\/strong> \u2014 Generates a new cryptographic key for symmetric authentication.<\/span><\/li>\n
                        <\/p><\/ul>\n
                        <\/div>\n
                        Manual Time & RTC<\/h6>\n
                          \n
                        • sudo chronyc settime <Time><\/code><\/strong> \u2014 Sets the daemon time manually (e.g., “16:30:05”) when offline.<\/span><\/li>\n
                        • chronyc rtcdata<\/code><\/strong> \u2014 Prints current Real-Time Clock (hardware clock) performance parameters.<\/span><\/li>\n
                        • sudo chronyc trimrtc<\/code><\/strong> \u2014 Corrects the hardware clock relative to the accurate system time.<\/span><\/li>\n
                          <\/p><\/ul>\n
                          <\/div>\n
                          \n
                           <\/div>\n
                          Manual Time & Date Configuration (NTP Offline)
                          <\/h6>\n
                            \n
                          • \n
                            Core Difference:<\/strong> timedatectl<\/code> vs date<\/code><\/div>\n
                              \n
                            • timedatectl<\/code> (Modern)<\/strong>: Manages everything at once. Automatically syncs system time with the hardware clock (BIOS), pauses conflicting time services, and controls time zones. Use it as the main tool on modern systems.<\/span><\/li>\n
                            • date<\/code> (Classic)<\/strong>: Changes time only in RAM<\/strong>. It is fast and universal but knows nothing about the BIOS or background time services. If you use it, you must manually sync with the BIOS<\/strong> using hwclock.<\/code><\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                              Modern Method<\/strong> (timedatectl<\/code>)<\/div>\n
                                \n
                              • sudo chronyc manual on<\/code><\/strong><\/span>\n
                                  \n
                                • Prepares chrony<\/code> for manual overrides (prevents it from reverting your changes).<\/span><\/li>\n
                                  <\/p><\/ul>\n
                                  <\/p><\/li>\n
                                • sudo timedatectl set-time \"2026-06-25 15:45:00\"<\/code><\/strong><\/span>\n
                                    \n
                                  • Sets both date and time simultaneously (Format: YYYY-MM-DD HH:MM:SS<\/code>).<\/span><\/li>\n
                                    <\/p><\/ul>\n
                                    <\/p><\/li>\n
                                  • sudo timedatectl set-time \"2026-06-25\"<\/code><\/strong><\/span>\n
                                      \n
                                    • Sets the date only (resets the clock to midnight 00:00:00<\/code>).<\/span><\/li>\n
                                      <\/p><\/ul>\n
                                      <\/p><\/li>\n
                                    • sudo timedatectl set-time \"15:45:00\"<\/code><\/strong><\/span>\n
                                        \n
                                      • Sets the time only (keeps the current date).<\/span><\/li>\n
                                        <\/p><\/ul>\n
                                        <\/p><\/li>\n
                                      • sudo timedatectl set-timezone America\/Los_Angeles<\/code><\/strong><\/span>\n
                                          \n
                                        • Changes the system time zone (updates the clock offset instantly).<\/span><\/li>\n
                                          <\/p><\/ul>\n
                                          <\/p><\/li>\n
                                        • timedatectl list-timezones<\/code><\/strong><\/span>\n
                                            \n
                                          • Lists all available time zones for the system.<\/span><\/li>\n
                                            <\/p><\/ul>\n
                                            <\/p><\/li>\n
                                          • timedatectl status<\/code><\/strong><\/span>\n
                                              \n
                                            • Verifies the final system time, time zone, and NTP status.<\/span><\/li>\n
                                              <\/p><\/ul>\n
                                              <\/p><\/li>\n
                                              <\/p><\/ul>\n
                                              <\/div>\n
                                              \n
                                              <\/div>\n
                                              Classic Method<\/strong> (date<\/code>)<\/div>\n
                                                \n
                                              • sudo chronyc manual on<\/code><\/strong><\/span>\n