[SalesForce] Start value in Wave analytics date range widget

In wave analytics dashboard I have a date range widget, which I want to be set to a date by default.
Is there a way to set an initial value? In my dashboard JSON I successfully used the following snippet for a toggle:

"start": {
                "display": [
                    "Ecosystem"
                ]
            }

What about date range?
I tried the following property:

"start": [[2017,3,31],[2017,4,10]]

By trial and error I found that this is the only syntax which does not throw errors but then the widget on initialization would be set to 01.01.1970. Is there any way to achieve this? I am using Trend for wave to visualize data over time and the widget is used to filter the system snapshots.

Best Answer

Found an answer! For anyone having the same problem: the correct way to do that is to use the nested array with date in milliseconds, like that:

"start": [
                [
                    1490869387000,
                    1491906187000
                ]
            ]
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