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Learn why you might see time-related errors on HTTPS websites and how you can troubleshoot these errors by correcting your system clock.

Firefox checks a [[Secure website certificate|website’s security certificate]] (those with addresses starting with '''https://''') to make sure it’s valid and hasn’t expired. If your computer’s date, time or time zone is incorrect, Firefox may show a security warning instead of loading the page. This article helps you: *Identify if your error is time-related. *Correct your system clock settings on Windows, macOS and Linux. *Understand why some errors can’t be bypassed. *Address edge cases like live USB systems or virtual machines. __TOC__ =Step 1 – Check if your error is time-related= If you see an error page like '''“Your Computer Clock is Wrong”''' or '''“Warning: Potential Security Risk Ahead”''', the issue may be your system clock. How to confirm: #On the error page, click {button Advanced…} #Look for one of these codes: #*_{SEC_ERROR_EXPIRED_CERTIFICATE} #*_{SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE} #*_{SEC_ERROR_OCSP_FUTURE_RESPONSE} #*_{SEC_ERROR_OCSP_OLD_RESPONSE} #*_{MOZILLA_PKIX_ERROR_NOT_YET_VALID_CERTIFICATE} #*_{MOZILLA_PKIX_ERROR_NOT_YET_VALID_ISSUER_CERTIFICATE} {note}'''Tip:''' The error page may also display the time Firefox detects on your system—compare it to the current time in your location.{/note} {for win}[[Image:Fx67YourComputerClockIsWrong]]{/for}{for mac}[[Image:Computer time wrong Mac]]{/for} <!--L10N, you can get this error message by setting your computer clock back a year, but feel free to use this image if you can't get a screenshot in your language --> =Step 2 – Set your system clock to the correct time= {for win11} #Click the ''Windows'' Start {button [[Image:Windows10StartButton]]} button or press the {key [[Image:Windows Key]]} key. #Type '''Date''' in the search bar. #Select {menu Date and time settings}. #Click {button Sync now} to update from an internet timeserver. #Make sure your time zone matches your location. If {button Sync now} is disabled or fails: *Turn off '''Set time automatically'''. *Manually set the correct date, time and time zone. [[Image:timewindows11]] {/for} {for win10} #Click the ''Windows'' Start {button [[Image:Windows10StartButton]]} button or press the Windows key {key [[Image:Windows Key]]}. #In the Start menu, select {menu Settings}. #In ''Settings'', select {menu Time & language}. #Go to {menu Date & time}. #Below ''Change date and time'', click {button Change}. #*You can also expand the '''Time zone''' dropdown menu.{note}If your system is set to manage the time and time zone automatically, you cannot make manual changes.{/note} #If you are done with your changes, close the ''Settings'' window. {/for} {for win8} #From the Start Screen, click the '''Desktop''' tile. #Select {menu Control Panel} from the {menu Settings}. #:[[Image:Control Panel - Win8]] #Click on '''Clock, Language, and Region''' and then '''Date and Time'''. #Click the {button Change date and time} or {button Change time zone} button. # To confirm your changes, click {button OK}. {/for} {for win7} #Click the Windows Start button or press the Windows key {key [[Image:Windows Key]]}. #Click {menu Control Panel}. #:[[Image:Control Panel - Win7]] #Click on '''Clock, Language, and Region''' and then '''Date and Time'''. #Click the {button Change date and time} or {button Change time zone} button. #To confirm your changes, click {button OK}. {/for} {for mac} #Click the Apple menu and select {menu System Preferences}. #In the ''System Preferences'' window, click '''Date & Time'''. #Disable {pref Set date and time automatically}. #Manually enter the date and time. #Click {button Save} to confirm your changes. {/for} '''Special cases – live USB, virtual machines, dual-boot systems''' If you use a live USB or virtual machine, your time may reset every time you start the system. You’ll need to set it manually each session or configure your OS to sync time automatically. =Step 3 – If the problem isn’t your system clock= If your time and time zone are correct, the website’s security certificate may have expired or been misconfigured. ==Contact the website owner== If you know the site administrator, tell them the certificate has expired or is invalid. They may need to renew or fix it. =Why you can’t always override these errors= Firefox’s security checks are automated—Firefox doesn’t decide which sites are “safe” based on reputation or government ownership. If a certificate is expired or invalid, Firefox will block the page to protect your privacy and data. In most cases, these blocks can’t be bypassed for expired certificates because they present real security risks (like allowing attackers to intercept your connection). =Quick checklist before trying again= *✅ System date and time are correct. *✅ Time zone matches your location. *✅ For live USB/VM users: time sync is configured. *✅ Website’s certificate isn’t expired (contact site owner if unsure). =Related articles= *[[How do I tell if my connection to a website is secure?]] *[[What do the security warning codes mean?]] *[[Firefox and other browsers can't load websites]] *[[Websites don't load - troubleshoot and fix error messages]]