slack-timedate/data/org.freedesktop.timedate1.xml

<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<node>
 <interface name="org.freedesktop.timedate1">
  <property name="Timezone" type="s" access="read"/>
  <property name="LocalRTC" type="b" access="read"/>
  <property name="NTP" type="b" access="read"/>
  <property name="CanNTP" type="b" access="read"/>
  <property name="NTPSynchronized" type="b" access="read"/>
  <method name="SetTime">
   <arg name="usec_utc" type="x" direction="in"/>
   <arg name="relative" type="b" direction="in"/>
   <arg name="user_interaction" type="b" direction="in"/>
  </method>
  <method name="SetTimezone">
   <arg name="timezone" type="s" direction="in"/>
   <arg name="user_interaction" type="b" direction="in"/>
  </method>
  <method name="SetLocalRTC">
   <arg name="local_rtc" type="b" direction="in"/>
   <arg name="fix_system" type="b" direction="in"/>
   <arg name="user_interaction" type="b" direction="in"/>
  </method>
  <method name="SetNTP">
   <arg name="use_ntp" type="b" direction="in"/>
   <arg name="user_interaction" type="b" direction="in"/>
  </method>
  <method name="ListTimezones">
   <arg name="timezones" type="as" direction="out"/>
  </method>
 </interface>
</node>