Is there a way to detect if the device's date is inaccurate using javascript? (For example, displaying an alert if the current date is 2016/6/16 but the device date is 2016/6/15)
Is there a way to detect if the device's date is inaccurate using javascript? (For example, displaying an alert if the current date is 2016/6/16 but the device date is 2016/6/15)
Verifying a device's clock accuracy with complete certainty is impossible. However, utilizing technologies like AJAX or WebSockets can help by requesting a datetime stamp from a trusted server and comparing it with the device's reported time. Keep in mind that there will always be a margin of error, mostly due to network latency.
For a practical approach:
<script type="text/javascript">
function myCallback(json) {
var internalNow = new Date();
var externalNow = new Date(json.dateString);
var msg = '';
if(
internalNow.getUTCFullYear() == externalNow.getUTCFullYear()
&& internalNow.getUTCMonth() == externalNow.getUTCMonth()
&& internalNow.getUTCDate() == externalNow.getUTCDate()
) {
msg = 'Date matches.';
}
else {
msg = 'Date DOES NOT match.';
}
alert(msg);
}
</script>
<script type="text/javascript" src="http://www.timeapi.org/utc/now.json?callback=myCallback"></script>
Note that this script uses www.timeapi.org which does not support HTTPS. Consider setting up your own time service for better security. Additionally, it may not account for minor fluctuations, particularly around midnight UTC.
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