Roberts R871 Manual page 5

Setting the local time and date
When the clock battery is first inserted the Hours and Minutes
will flash in the clock display ready to be set. In this case
proceed to step 2 below. If the clock time or date needs to be
changed after the initial setting has taken place, start at step 1.
1. Press and hold the "Mode" button for at least 5 seconds. The
Hours and Minutes will flash in the clock display indicating
that the Local time can be adjusted.
2. Press the "Forward" or "Reverse" button until the correct
Hour and Minute are shown. The clock starts running as
soon as the "Forward or "Reverse" button has been
released.
3. Whilst the display is flashing (within 8 seconds), press and
release the "Mode" button, the Month and Date will flash in
the calendar display indicating that the date of the Local time
can be adjusted. Press the "Forward" or "Reverse" button
until the correct Month and Date are shown.
4. Whilst the display is flashing (within 8 seconds), press and
release the "Mode" button, the Year will flash on the time
display indicating that it can be adjusted. Press the "Forward"
or "Reverse" button until the correct Year is shown.
5. Press and release the "Mode" button to finish the Local
Time setting process. The day of week is set automatically
after the above procedure is carried out.