Wrong date and time on my Mac

bevtherev4 wrote:

Switched my Mac on today and showing wrong date and time but won’t let me change it but is connected ok to Wi-Fi

Unlock the padlock and make some changes...

ref: If the date or time is wrong on your Mac

from Terminal you can re-sync the time server if necessary, copy and paste:

sudo sntp -sS time.apple.com

jimpthy wrote:

This works temporarily for me but when I switch my laptop back on it returns to an old date and time. Any other suggestions?

To trouble shoot further you can:

—SafeBoot How to use safe mode on your Mac - Apple Support

Takes a bit longer to get to the login screen, does a quick disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc.

Login and test. Reboot as normal and test.

Uninstall all third party apps that are Cleaners/Optimizers/VPN/Anti-Virus

all known to cause issues on the macOS

If no insight or resolve try reinstalling the macOS on top of your existing macOS to sort anomalies—

How to reinstall macOS

Recovery (both M1 and Intel) — How to reinstall macOS - Apple Support

This works temporarily for me but when I switch my laptop back on it returns to an old date and time. Any other suggestions?