Tvheadend

You mean in Kodi? There's nothing by default, but I believe you can simulate it with keymaps, e.g. http://forum.kodi.tv/showthread.php?tid=211496

I use Openelec 4.0.7.
Does not work
<keymap>
<TVGuide> ..... i tried tvguide, guide, PVROSDGuide, MyTv, LiveTV, mytv, livetv.....or window10602,10607,10611.......
<keyboard>
<pageup>skipnext</pageup>
<pagedown>skipprevious</pagedown>
</keyboard>
</TVGuide>
</keymap>

Opening window ( all programs ) EPG key e
<e>XBMC.ActivateWindowAndFocus(MyPVR, 31,0, 10,0)</e>

I am Czech, translate through google.
Thank you.

I just created a keymap.xml in ~/.kodi/userdata/keymaps:

<keymap>
<TVGuide>
  <keyboard>
   <pageup>skipnext</pageup>
   <pagedown>skipprevious</pagedown>
  </keyboard>
</TVGuide>
</keymap>

I restarted Kodi, and I now can use PgUp/PgDown to move 12 hours forwards and backwards. So it works perfectly for me.

You just need to find where to put the keymap.xml file in OpenELEC, I suspect... I'd guess at /storage/.kodi/userdata/keymaps/keymap.xml. Indeed, you don't have to guess, because this page tells you where it is...

Just to prove the point, I enabled debug logging and found the names for Home and End ("home" and "end", somewhat disappointingly) and tried those - this also works without problem, and PgUp and PgDown now retain their function to go up and down the list:

<keymap>
<TVGuide>
  <keyboard>
   <home>skipnext</home>
   <end>skipprevious</end>
  </keyboard>
</TVGuide>
</keymap>

I use Openelec-XBMC 4.0.7. predecessor Kodi

File is located "/storage/.xbmc/userdata/keymaps/keyboard.xml"

File keyboard.xml or keymap.xml ???

Shouldn't matter. As long as it's a valid xml file in the right place, it should work.

if you try keyboard.xml, and it doesn't work, then rename it

(Debug logging will tell you if it's being read or processed as Kodi starts).

And yes, if you're still on XBMC then .kodi ==> .xbmc

Rename keyboard.xml keymap.xml doesn't work.
Tomorrow try Kodi version.
Thank you.

Mystery explained.

I use XBMC 4.0.7 (Generic i386 32bit)- desired function is not working

Tested Kodi 5.0.8 (Generic i386 32bit) - desired function works

I knew someone how to run desired function XBMC 4.0.7 (Generic i386 32bit) ?

Thank you.

It's probably a question for the Kodi forums rather than here... but you need to find the key codes for those buttons and the section names for the XML. Debug logging might tell you... switch it on, navigate to the EPG, and press the right buttons, then read the log very carefully to see what it tells you.

Alternatively, upgrade OpenELEC if you possibly can - 4.0.7 is XBMC Gotham 13.1, and they're just moving to beta 2 of Javis 16.0 (which will end up as OpenELEC 7.0, I suppose)- so you're on an increasingly-unsupported version.

The best I could find for you was this otherwise:

http://forum.kodi.tv/showthread.php?tid=206214

You might need to dig around to find threads from two years ago, to see what keymaps were supported by PVR at that time. There might also be something in the global (system default) keymap.