Forward and rewind time in dashboard

What’s the easiest way to rewind and forward all graphs and gauges to use the same block time, defined as a context variable?

Typically you would use the built-in dashboard time feature. Choosing a date will set a query parameter on your dashboard’s URL t=TIMESTAMP_IN_MILLISECONDS.

Is there a reason you’re trying to do this via context variable instead? i.e. Is there a use case where the available feature isn’t working for your use case?