On Monday, March 25, 2019 at 2:59:29 PM UTC-7, John Robertson wrote:
On 2019/03/25 10:28 a.m., David Farber wrote:
This Dell Inspiron N5110... The system time does not advance
when the unit is turned off.

Something is wrong with the on-board RTC - Real Time Clock.

You need to identify that chip or module and first see if its crystal is
damaged.

Another poster has suggested a circuit diagram
http://kythuatphancung.vn/uploads/download/22163_DELL_N5110.pdf

and the crystal would be X2101 and its associated components, R2101, C2101, C2102,
depicted on 'sheet 21 of 108' (see the label on lower left page corners) and connected
to pins A20 and C20 of the 'Cougar Point' big integrated circuit.