Actually, your Tama has to be 6 years(6 days). Literally. If you use the age increasing trick (the time change you mentioned) , your Tama will NOT have access to the dating place. You did it to wake your tama up, right? If so you are doing the trick. But not on purpose. To avoid this AND wake your tama up,press the button to the right if you want to wake your tama up.
~Angelsky~