// Go to https://account.templatemonster.com/#/billing and scroll down to show enough BILLING HISTORY items
// Then run the script


{
    const dateRegex = /aug \d+, 2017/i
//         startDate = new Date('2017-8-1 00:00:00'),
//         endDate = new Date('2017-9-1 00:00:00'),
        allRows = Array.from($$( '.billing-history-operation' ));
    
    let rowsWithinTimeFrame = [];

    rowsWithinTimeFrame = allRows.filter(($row) =>  {
        let rowDate = $row.querySelector('.billing-history-operation-info__date').innerText;
//         rowDate = new Date(rowDate);
        
        return dateRegex.test(rowDate);
//         return daterowDate >= startDate && rowDate < endDate;
    });

    rowsWithinTimeFrame.reduce((sum, $row) => {
        let $moneyNode = $row.querySelector('.billing-history-operation-info__balance .format-currency'),
            $centsNode,
            dollars = $moneyNode.innerText;
        
        dollars = parseFloat(dollars.match(/[\d\.]+/)[0]);

        if ($row.classList.contains('billing-history-operation_type_refund')) { // refunds are negative
            dollars = -dollars;
        }

        return sum + dollars;
    }, 0);
}