My time and date settings re sets every time I switch power off on the Pentax k7

SOURCE: setting time and date

Locate your manual at the link below - it is there and it is free!
http://www.sharp.ca/manuals/
Do a reset (pressing the pictured button) and then reenter current information.

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SOURCE: Date/Time Set Won't Work

Write to Canon's customer service. I dropped my camera in water briefly and wrote them. They offered me the chance to replace my camera at an outstanding price or have it repaired. Give them a try!

SOURCE: Sony DSC-W150 power on keeps going to set date/time

set it up

SOURCE: Canon A470

There is another battery next the the AA battery under a little cover marked CR1220. That is the battery size. If that battery is dead, or has never been installed then every time you change the AA batteries the camera will forget the time and date. Try to get one from a specialty store that turns over its inventory quickly and you may find that you will only change this battery every 2 or 3 years.

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SOURCE: says date/time not set but wont let me set the time or date!

Broken keypad ribbon. It's because the keypad ribbon is folded over twice and the creases split over time. have a look at my tips page for this problem. It won't help you much I know and the only solution is a replacement membrane.