public function getStartTimeChart($time_frame = 30, $timeSpan = '1 day')
{
if ($timeSpan == 'MAX') {
$oldest_trade = Trade::orderBy('created_at', 'asc')->first();
if (isset($oldest_trade->id)) {
$previous_day = strtotime($oldest_trade->created_at);
} else {
$previous_day = strtotime(date('Y-m-d H:i:s'));
}
} else {
$previous_day = strtotime(date('Y-m-d H:i:s') . " -" . $timeSpan);
}
// echo "<br>Cur: ".date("Y-m-d H:i:s");
// echo "<br>timeSpan: ".$timeSpan;
// echo "<pre>previous_day: "; print_r(date("Y-m-d H:i:s",$previous_day)); echo "</pre>";
// $hour_minute = date('H:i',$previous_day);
$hour = date("H", $previous_day);
$minute = date("i", $previous_day);
if ($minute < $time_frame) {
$minute = 0;
} else {
$minute = $time_frame;
}
$hour_minute = mktime($hour, $minute, 0);
$result['start_time'] = date("H:i", $hour_minute);
$date = mktime($hour, $minute, 0, date('m', $previous_day), date('d', $previous_day), date('Y', $previous_day));
$result['start_date'] = date("Y-m-d H:i:s", $date);
return $result;
}