curl -X GET --header 'Accept: application/json' --header 'Authorization: Token token=be4ae0d2f91124c356e391cfbf7bd607beb6389a86c42ef010b39c5ccd0a8c01' 'https://api.pocketmath.com/v2/stats/orders.json?from=2015-10-28T00%3A00%3A00.000%2B12:00&to=2015-10-30T00%3A00%3A00.000%2B12:00'
2015-10-28T00:00:00.000+08:00 is the same as 2015-10-27T16:00:00.000Z.
We will be looking at updating the documentation in soon, thanks for the suggestion.