What does the Timestamp expired response from REST API mean when triggering an event?

Part of Pusher's authentication process is to require your machine's timestamp as part of the request. This is represented as the "auth_timestamp" parameter in the request. For more info, please see: https://pusher.com/docs/channels/library_auth_reference/rest-api#authentication
If the timestamp is not within the allowed time period the response body will be similar to the following:
Timestamp expired: Given timestamp (2013-06-17T15:39:38Z) not within 600s of server time (2013-06-17T17:09:21Z)
To fix this issue, you will need to:
  • Update your system time to reflect the current date and time
  • Sync your system's clock to a time server to automatically update this in future (Optional)
If required, for more information, see below:
To check the current machine time on your system, please run the date command from the console. Is the output correct?
If not, you can correct the time on your machine by going to your console and using date to modify it. In most cases, you will need to give yourself sudo access on your machine.
$ sudo date MMddhhmmyyyy
MM - Month (two-digit numeric month)
dd - Day (two-digit numeric day i.e. day of month)
hh - Hour
mm - Minutes
yy - Year
So, for example, if we wanted to change the current time to 11:30am on Monday 16th March 2019, we would type the following:
$ sudo date 030411302019
In Date & time, you can choose to let Windows 10 set your time and time zone automatically, or you can set them manually.
To set your time and time zone in Windows 10, go to Start  > Settings  > Time & language > Date & time
See https://support.microsoft.com/en-ca/help/4026213/windows-how-to-set-your-time-and-time-zone 
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