Yes, you can. Pokemon HeartGold uses the time from your DS settings. So, change the time on the DS and the time in Pokemon HeartGold will change with it.
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u have to change your ds time and date then your Pokemon games time and date will be the same
You have to change the time on your DS in settings.
just go to the nintendoes options and change the time.
Unfortunately, you can't change gears on bikes in HeartGold.
no