这算的时间怎么还多出来一个月

请忽略：黑帝DJ室内设计师呢民族精神就睡觉你这是那你说你在哪睡觉你电脑上那是那是缪斯女神没怎么睡

calendar.set(2023,1,1); 月份从0开始，表示1月，你是1，所以是2月份，当然是多了一个月的时间。

一月是0

void java.util.Calendar.set(int year, int month, int date)
Sets the values for the calendar fields YEAR, MONTH, and DAY_OF_MONTH. Previous values of other calendar fields are retained. If this is not desired, call clear() first.

Parameters:
  year the value used to set the YEAR calendar field.
  month the value used to set the MONTH calendar field. Month value is 0-based. e.g., 0 for January.
  date the value used to set the DAY_OF_MONTH calendar field.