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full instructions are in the user manual, and will tell how to insert the code

Call Lenovo tech support phone number at 1-800-204-4427. Lenovo 24 hour customer service number is available for full tech support for Lenovo PC's and ...

Copy following link to identify timer and download possible manual:
http://waterheatertimer.org/Woods-timers-and-manuals.html#oval
Add comment and describe timer in detail.
Usually if a timer offers choice between 24-hour clock with 1-thru-24 displaying for current time, vrs 12 hour am- 12 hour pm, then the choice is first thing you set before programming. The choice is made before setting current time, and usually this is accomplished with single button push that toggles between 12 and 24 on the display.
The product manual has specific steps.
Not every timer offers 12-24 choice.
Again, add comment and describe timer in detail, or attach photo for best available resources.
Gene
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following link for possible manual:
http://waterheatertimer.org/pdf/Possible-manual-for-Powerfix-timer.pdf

Powerflix appears to be 24-hour 230Volt European version of 12-or-24-hour 120Volt UPM ET170 timer.
Copy following link to help identify timer buttons and download possible manual.
http://waterheatertimer.org/UPM-timers-and-manuals.html#ET170

Google search results show fixya on first page generally means there is NO information available on this device.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

It's in the manual which is available at Bose.com

To set AM/PM (12 hour) or Military (24 hour) time - Press the On/Off button once to turn your Wave radio off.

Press and hold Clock Set, and then press On/Off to switch between AM/PM (12 HR) or military (24 HR) formats

You can set the clock to a 12 or 24 hour system.
For 12 hour - Touch clock pad once Enter the time using the number digits (1:00-12:59) Touch clock pad again
For 24 hour - Touch clock pad twice Enter the time using the number digits (0:00-23:59) Touch clock pad again

GRAND TOTAL / RATE SETTING MODE SELECTOR:
"GT": Grand Total
"•": Neutral
"RATE SET": To set the date, time, and tax rate, set this switch at the "RATE SET" position.
Date:
• Enter in the order of month, day and year, then press to complete the entry.
• Use to separate month, day, and year.
• When is pressed, the number entered is evaluated and displayed as "date" if the
value is within the following range; "Error" is displayed otherwise, and the previously set
date is restored.
Month: 1 - 12; day: 1 - 31; Year: 2000 - 2099 (in 4 digits) or 00 - 99 (in 2 digits)
Time:
• Enter in the order of hour, minutes, then press to complete the entry.
(There is no entry available for the seconds value. The clock starts at zero second.)
• If the hour/minute digit is less than 10, it is not necessary to enter the first digit "0".
• Use to separate hour and minute values.
• When is pressed, the number entered is evaluated and displayed as "time" if the
value is within the following range; "Error" is displayed otherwise, and the previously set
time is restored.
Hour: 0 - 23 (24-hour system for the hour entry), Minute: 0 - 59

GRAND TOTAL / RATE SETTING MODE SELECTOR:
"GT": Grand Total
"•": Neutral
"RATE SET": To set the date, time, and tax rate, set this switch at the "RATE SET" position.
Date:
• Enter in the order of month, day and year, then press to complete the entry.
• Use to separate month, day, and year.
• When is pressed, the number entered is evaluated and displayed as "date" if the
value is within the following range; "Error" is displayed otherwise, and the previously set
date is restored.
Month: 1 - 12; day: 1 - 31; Year: 2000 - 2099 (in 4 digits) or 00 - 99 (in 2 digits)
Time:
• Enter in the order of hour, minutes, then press to complete the entry.
(There is no entry available for the seconds value. The clock starts at zero second.)
• If the hour/minute digit is less than 10, it is not necessary to enter the first digit "0".
• Use to separate hour and minute values.
• When is pressed, the number entered is evaluated and displayed as "time" if the
value is within the following range; "Error" is displayed otherwise, and the previously set
time is restored.
Hour: 0 - 23 (24-hour system for the hour entry), Minute: 0 - 59