Certificate not yet valid after renewal?

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My domain is: the domain is used for sstp tunnel on a router

I ran this command: within GUI operation

It produced this output:

My web server is (include version): no webserver running

The operating system my web server runs on is (include version): RouterOS 6.37.4

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don’t know):yes
I’m using a control panel to manage my site (no, or provide the name and version of the control panel):

I renewed certificate about 2 hours ago using https://www.sslforfree.com/ with DNS verification.
After I installed the certificate, I found that it’s invalid before Jun/12/2017 11:18:00, which is just 5min before the old certificate expires. But it’s 6:50 GMT now and means the new certificate is not yet valid?

Unless something’s changed, the start time for a Let’s Encrypt certificate is 1 hour before it was issued (with minute precision).

Unless something’s quite wrong, probably your computer has an inaccurate clock, or a surprising time zone setting, or both.

my computer and router are set to correct time and timezone(GMT+8), and the sstp server using the new certificate is working correctly.
if the “invalid before” timezone is GMT+8, it’s definitely 1 hour before issue, but firefox says it’s a GMT timezone.
So, what should be the timezone of “invalid before”?

Certificates are NOT issued in your time zone.
They are always issued in GMT time zone.

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