Missing date & time from top panel of Unity Desktop - Ubuntu 14.04

Solution 1:

Try reseting its configuration

dconf reset -f /com/canonical/indicator/datetime/ 

If it didn't show up try kill it, it should restart

pkill -f datetime

For similar cases, better to explain how you may get it:

1. Check if it is running, if yes then possibly a configuration problem

   $ ps ax | grep -i indicator-datetime
    2863 ?        Ssl    0:00 /usr/lib/x86_64-linux-gnu/indicator-datetime/indicator-datetime-service
    4043 pts/0    S+     0:00 grep -i indicator-datetime
   

2. Check for where is its configuration. Look for /etc/ or dconf in /usr/share/glib-2.0/schemas/. List package files using:

   $ dpkg -L indicator-datetime
   [...]
   /etc/xdg/autostart/indicator-datetime.desktop
   /usr
   /usr/share
   /usr/share/glib-2.0
   /usr/share/glib-2.0/schemas
   /usr/share/glib-2.0/schemas/com.canonical.indicator.datetime.gschema.xml
   [...]
   

3. Locate its dconf path:

   $ grep path /usr/share/glib-2.0/schemas/com.canonical.indicator.datetime.gschema.xml
       <schema id="com.canonical.indicator.datetime" path="/com/canonical/indicator/datetime/" gettext-domain="indicator-datetime">
   

Solution 2:

This worked with me when I faced the same problem:

killall unity-panel-service

without 'sudo' by the way.