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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.

[[Secure website certificate|Secure website certificates]] (those with addresses starting with '''https://''') have a limited validity duration. If your computer's date doesn't align with a website's certificate validity dates, Firefox will display an error, as it can't confirm the site's security. To resolve this, ensure your computer's date, time, and time zone are accurate. If the issue persists, it might be due to other factors like a server misconfiguration or an outdated certificate. __TOC__ =List of time-related error codes you may encounter= {note}'''Note:''' A ''Your Computer Clock is Wrong'' error page almost certainly means that your computer's clock is set to the wrong date. Some time-related errors will show a ''Warning: Potential Security Risk Ahead'' error page, described in [[What do the security warning codes mean?|this article]]. For other time-related errors, you'll get a ''Secure Connection Failed'' or ''Did Not Connect: Potential Security Issue'' error page, described [[Secure connection failed and Firefox did not connect|here]].{/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 --> Click {button Advanced…} on the error page to view the error code. One of the following error codes will indicate that the secure connection couldn't be established due to a time-related error: _{SEC_ERROR_EXPIRED_CERTIFICATE}<br> _{SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE}<br> _{SEC_ERROR_OCSP_FUTURE_RESPONSE}<br> _{SEC_ERROR_OCSP_OLD_RESPONSE}<br> _{MOZILLA_PKIX_ERROR_NOT_YET_VALID_CERTIFICATE}<br> _{MOZILLA_PKIX_ERROR_NOT_YET_VALID_ISSUER_CERTIFICATE} The text on the error page will warn you when Firefox detects that your system date and time is probably wrong and will also show the date and time currently set in your system. If the clock settings are incorrect you should set it to the right time{for win, mac} as explained below{/for}. Even if the displayed time settings seem to be correct, you should make sure that the time zone settings of your system match your current location. = Set your system clock to the correct time = Time-related errors on secure websites caused by a skewed system clock can be resolved by setting your correct date, time and time zone{for mac}:{/for}{for win,linux}.{/for}{for win} Change your date and time settings from the clock on the Windows taskbar or follow these instructions:{/for} {for win10} # Click the Windows Start button or press the Windows key {key [[Image:Windows Key]]}. # In the Start menu, select {menu Settings}. # In Settings, select {menu Time & language}. # In the {menu Date & time} section you can review the current date and time settings. To change your settings click on {button Change} below {menu Change date and time} or expand the {menu 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 win11} # To adjust your date and time settings in Windows 11, begin by clicking the Windows Start Button or pressing the Windows key {key [[Image:Windows Key]]}. # Type {menu Date} in the search bar. # Select {button Date and Time Settings} in the side menu. # Click {button Sync Now} to sync your computer's time with the time server. # You could also choose a specific time zone by clicking on {button Time Zone} button and choosing the preferred time zone. '''If the {button Sync Now} button is grayed out, clicking it shows an error message, or it doesn't resolve the problem, follow these steps:''' # Toggle the switch next to {menu Set time automatically} if you do have it to disable automatic time setting. # Click {button Time Zone} and select your preferred time zone. # If you don't see the {button Time Zone} button and you see the {button Set the date and time manually}, Click {button Set the date and time manually} and a window will open, allowing you to input the correct date and time manually. # After making the necessary changes, don't forget to click {button Save} to apply your adjustments. {/for} {for win8} # From the Start Screen, click the '''Desktop''' tile. The Desktop view will open. # From the Desktop, hover in the lower right-hand corner to access the Charms. # Select {menu Control Panel} from the {menu Settings} charm. The Control Panel window will open. #:[[Image:Control Panel - Win8]] # In the Control Panel window, click on '''Clock, Language, and Region''' and then '''Date and Time'''. # The panel that opens shows the current date and time settings. To change your settings 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]]}. # In the Start Menu, click {menu Control Panel}. #:[[Image:Control Panel - Win7]] # In the Control Panel window, click on '''Clock, Language, and Region''' and then '''Date and Time'''. # The panel that opens shows the current date and time settings. To change your settings 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 on '''Date & Time'''. # The panel that opens shows the current date and time settings. In order to adjust them, disable {pref Set date and time automatically}, manually enter the date and time and click {button Save} to confirm your changes. # In order to review your time zone settings, click on the '''Time Zone''' tab. In order to adjust your time zone, disable {pref Set time zone automatically using current location}, click onto your approximate location in the map and select the city closest to you in the dropdown panel. # If you are done with your changes, close the Date & Time window. For more information see Apple's [https://support.apple.com/HT203413 If the date or time is wrong on your Mac] article. {/for} {note}'''Note:''' If the clock on your device constantly resets after you power it off, this might indicate that the battery cell that runs the real-time clock is getting low or is empty. Please consult your manufacturer's manual on how to replace the CMOS battery.{/note} = Contact the website owner = If you get a time-related error on a secure website and you have already checked the correct settings of your system’s clock, please contact the owner of the website which you can’t access and inform them of the problem. The website owner might need to renew the expired certificate, for example.