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Actually you can reset the clock. Under the title screen, press Select+Down+B. The game will prompt you to reset the clock. However, it will require a password which depends on your savegame factors such as name, money, and trainer ID. This site will tell you how to calculate that password: http://www.geocities.com/thelegendarydogs/faqs/gsc/time/timereset.htm
You are not able to reset the clock in Pokémon Crystal. You can only do this in Pokémon Gold/Silver.
When you change your DS's time Soulsilver/Heartgold automatically changes to the DS's time setting. You can check the Pokegear's clock.
When you are at the menu where you pick your character, click on the telephone and then click "reset clock." From there, you can change the time at any given point.
Press B+Up+Select at the Title Screen to reset the Pokemon White game.