About clock saving settings

[Fesiitis]

Hy, I've noticed that LMDE (maybe also Ubuntu based) on shutdown saves system clock. It's all good, but after shutdown this time also is saved on BIOS. During install LMDE I've set GMT +2 time zone, so the BIOS clock is always saved as two hours later (LMDE > 15:00 (OK), BIOS > 13:00 (not OK). How I can disable or fixing this saving settings?