The clock time is keep by a battery or capacitor on some models (not the main one) but a small one on the motherboard when the computer is off. When the computer is on and online it will automatically update the clock time.

Normally that battery last 3-5 years.

Try setting the time manually, by getting the actual update for apple time server.

sudo ntpdate -u time.apple.com

then you will see something like

8 Jun 14:30:11 ntpdate[28267]: adjust time server 17.151.16.14 offset 0.000336 sec

You generally don’t need to do this if you use the “Set date and time automatically” feature within the Date & Time settings.

If that did not work, reset your SMC and PRAM (System management Controller)

I can not believe it is your battery but everything is possible :(. Assuming you do not have 2 left hands, you could do that your self.

The clock time is keep by a battery or capacitor on some models. It is a small battery on the motherboard and used when the computer is off.

When the computer is on and online it will automatically update the clock time.

Normally that battery last 3-5 years.

Try setting the time manually, by getting the actual update for apple time server.

sudo ntpdate -u time.apple.com

then you will see something like

8 Jun 14:30:11 ntpdate[28267]: adjust time server 17.151.16.14 offset 0.000336 sec

You generally don’t need to do this if you use the “Set date and time automatically” feature within the Date & Time settings.

If that did not work, reset your SMC and PRAM (System management Controller)

I can not believe it is your battery but everything is possible :(. Assuming you do not have 2 left hands, you could do that your self.

The clock time is keep by a battery (not the main one) but a small one on the motherboard when the computer is off. When the computer is on and online it will automaticaly update the clock time.

Normally that battery last 5 years.

Try setting the time maualy, by getting the actual update for apple time server.

sudo ntpdate -u time.apple.com

then you will see something like

8 Jun 14:30:11 ntpdate[28267]: adjust time server 17.151.16.14 offset 0.000336 sec

You generally don’t need to do this if you use the “Set date and time automatically” feature within the Date & Time settings.

If that did not work, reset your SMC (System management Controller)

The clock time is keep by a battery or capacitor on some models (not the main one) but a small one on the motherboard when the computer is off. When the computer is on and online it will automatically update the clock time.

Normally that battery last 3-5 years.

Try setting the time manually, by getting the actual update for apple time server.

sudo ntpdate -u time.apple.com

then you will see something like

8 Jun 14:30:11 ntpdate[28267]: adjust time server 17.151.16.14 offset 0.000336 sec

You generally don’t need to do this if you use the “Set date and time automatically” feature within the Date & Time settings.

If that did not work, reset your SMC and PRAM (System management Controller)

I can not believe it is your battery but everything is possible :(. Assuming you do not have 2 left hands, you could do that your self.