A:Answer As per the 'Setting the Clock' instructions on page 11 in your owner's manual for the LG 2.0 Cu. Ft. Countertop Microwave with Sensor Cooking and Smart Inverter - Stainless Steel, Model # MSER2090S:
Setting the Clock
When the oven is plugged in for the first time or
when power resumes after a power interruption,
the clock defaults to the 12-hour clock mode and
12H appears in the display. You can set the time of
day or switch to the 24-hour clock mode.
1 Press START/Enter to confirm the 12H clock display.
• To switch between the 12-hour and 24-hour clock modes, press Timer/Clock.
2 Press the number keys to set the desired hour and minutes, and press START/Enter.
NOTE
• To reset the clock, unplug and reconnect the power cord. Or press and hold Timer/Clock until
12H appears in the display (approximately 3 seconds).
• To keep the time of day from appearing in the display, press STOP/Clear after plugging in the oven.
• When the oven is not in use, the display turns off to save energy, unless the time of day is set to
show in the display...^Ivan.