谷歌图表显示错误的月份

Question

我有一个谷歌折线图，它显示了正确的线；但是日期的注释正好相差一个月。 json数据有正确的日期；但不知何故谷歌图表改变了它：

有人知道为什么会这样吗？

Answer 1

没有错，正在显示正确的月份

使用以下日期构造函数时，月份从零开始...

Date(year, month, day, hour, min, sec, mill)

看下面的sn-p...

console.log(new Date(2016,  0, 1)); // <-- Jan
console.log(new Date(2016,  1, 1)); // <-- Feb
console.log(new Date(2016, 11, 1)); // <-- Dec

以下是另一个sn-p，用于演示如何将json与谷歌图表一起使用……

google.charts.load('current', {
  callback: function () {
    var data = new google.visualization.DataTable({
      "cols": [
        {"label": "Date", "type": "date"}
      ],
      "rows": [
        {"c": [{"v": "Date(2016,0,28,15,0,0)"}]},
        {"c": [{"v": "Date(2016,1,28,15,0,0)"}]},
        {"c": [{"v": "Date(2016,2,28,15,0,0)"}]},
        {"c": [{"v": "Date(2016,3,28,15,0,0)"}]},
        {"c": [{"v": "Date(2016,4,28,15,0,0)"}]},
        {"c": [{"v": "Date(2016,5,28,15,0,0)"}]},
        {"c": [{"v": "Date(2016,6,28,15,0,0)"}]},
        {"c": [{"v": "Date(2016,7,28,15,0,0)"}]},
        {"c": [{"v": "Date(2016,8,28,15,0,0)"}]},
        {"c": [{"v": "Date(2016,9,28,15,0,0)"}]},
        {"c": [{"v": "Date(2016,10,28,15,0,0)"}]},
        {"c": [{"v": "Date(2016,11,28,15,0,0)"}]},
      ]
    });

    var chart = new google.visualization.Table(document.getElementById('chart_div'));
    chart.draw(data);
  },
  packages:['table']
});

<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>

以下是使用上述构造函数创建json日期的php sn-p

<?php
$date1 = new DateTime();
$date2 = "Date(".date_format($date1, 'Y').", ".((int) date_format($date1, 'm') - 1).", ".date_format($date1, 'd').", ".date_format($date1, 'H').", ".date_format($date1, 'i').", ".date_format($date1, 's').")";

echo $date2;
?>

here is a php fiddle测试上面的sn-p...