'\" t
.TH "SYSTEMD\-TIMEDATED\&.SERVICE" "8" "" "systemd 254" "systemd-timedated.service"
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.SH "NAME"
systemd-timedated.service, systemd-timedated \- Time and date bus mechanism
.SH "SYNOPSIS"
.PP
systemd\-timedated\&.service
.PP
/usr/lib/systemd/systemd\-timedated
.SH "DESCRIPTION"
.PP
systemd\-timedated\&.service
is a system service that may be used as a mechanism to change the system clock and timezone, as well as to enable/disable network time synchronization\&.
systemd\-timedated
is automatically activated on request and terminates itself when it is unused\&.
.PP
The tool
\fBtimedatectl\fR(1)
is a command line client to this service\&.
.PP
systemd\-timedated
currently offers access to the following four settings:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
The system time
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
The system timezone
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
A boolean controlling whether the system RTC is in local or UTC timezone
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Whether the time synchronization service is enabled/started or disabled/stopped, see next section\&.
.RE
.PP
See
\fBorg.freedesktop.timedate1\fR(5)
and
\fBorg.freedesktop.LogControl1\fR(5)
for information about the D\-Bus API\&.
.SH "LIST OF NETWORK TIME SYNCHRONIZATION SERVICES"
.PP
\fBsystemd\-timesyncd\fR
will look for files with a
"\&.list"
extension in
ntp\-units\&.d/
directories\&. Each file is parsed as a list of unit names, one per line\&. Empty lines and lines with comments ("#") are ignored\&. Files are read from
/usr/lib/systemd/ntp\-units\&.d/
and the corresponding directories under
/etc/,
/run/,
/usr/local/lib/\&. Files in
/etc/
override files with the same name in
/run/,
/usr/local/lib/, and
/usr/lib/\&. Files in
/run/
override files with the same name under
/usr/\&. Packages should install their configuration files in
/usr/lib/
(distribution packages) or
/usr/local/lib/
(local installs)\&.
.PP
\fBExample\ \&1.\ \&ntp\-units\&.d/ entry for systemd\-timesyncd\fR
.sp
.if n \{\
.RS 4
.\}
.nf
# /usr/lib/systemd/ntp\-units\&.d/80\-systemd\-timesync\&.list
systemd\-timesyncd\&.service
.fi
.if n \{\
.RE
.\}
.PP
If the environment variable
\fI$SYSTEMD_TIMEDATED_NTP_SERVICES\fR
is set,
\fBsystemd\-timesyncd\fR
will parse the contents of that variable as a colon\-separated list of unit names\&. When set, this variable overrides the file\-based list described above\&.
.PP
\fBExample\ \&2.\ \&An override that specifies that chronyd should be used if available\fR
.sp
.if n \{\
.RS 4
.\}
.nf
SYSTEMD_TIMEDATED_NTP_SERVICES=chronyd\&.service:systemd\-timesyncd\&.service
.fi
.if n \{\
.RE
.\}
.SH "SEE ALSO"
.PP
\fBsystemd\fR(1),
\fBtimedatectl\fR(1),
\fBlocaltime\fR(5),
\fBhwclock\fR(8),
\fBsystemd-timesyncd\fR(8)