Calender設定固定時間遇到的問題

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在使用Calender擷取執行個體，設定成UTC時區時，發現比我們常規的月份多了一個月：

範例程式碼如下：

Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));calendar.set(2016, 9, 11, 16, 0, 0);System.out.println(calendar.getTime());

列印的結果為：

Wed Oct 12 00:00:00 CST 2016

即2016-10-12 00：00：00，比我們設定的月份多了一個月。

我們來看下calender中set的源碼：

    /**     * Sets the values for the fields <code>YEAR</code>, <code>MONTH</code>,     * <code>DAY_OF_MONTH</code>, <code>HOUR_OF_DAY</code>, <code>MINUTE</code>, and     * <code>SECOND</code>.     * Previous values of other fields are retained.  If this is not desired,     * call {@link #clear()} first.     *     * @param year the value used to set the <code>YEAR</code> calendar field.     * @param month the value used to set the <code>MONTH</code> calendar field.     * Month value is 0-based. e.g., 0 for January.     * @param date the value used to set the <code>DAY_OF_MONTH</code> calendar field.     * @param hourOfDay the value used to set the <code>HOUR_OF_DAY</code> calendar field.     * @param minute the value used to set the <code>MINUTE</code> calendar field.     * @param second the value used to set the <code>SECOND</code> calendar field.     * @see #set(int,int)     * @see #set(int,int,int)     * @see #set(int,int,int,int,int)     */    public final void set(int year, int month, int date, int hourOfDay, int minute,                          int second)    {        set(YEAR, year);        set(MONTH, month);        set(DATE, date);        set(HOUR_OF_DAY, hourOfDay);        set(MINUTE, minute);        set(SECOND, second);    }

看上面代碼中飄紅的部分，一月份是從0開始的~顯而易見，需要將月份-1

Calender設定固定時間遇到的問題