Flutter DateTime获取本月的开始时间与结束时间方法

void getMonthStartEnd() {
  DateTime now = DateTime.now(); // 获取当前日期时间
  DateTime monthStart = DateTime(now.year, now.month, 1); // 获取本月第一天的日期时间
  DateTime monthEnd = DateTime(now.year, now.month + 1, 0, 23, 59, 59); // 获取本月最后一天的日期时间（时间为23:59:59）
  print('本月开始时间：${monthStart.toString()}');
  print('本月结束时间：${monthEnd.toString()}');
}

DateTime now = DateTime.now();

DateTime dateTime = DateTime(2022, 2, 22, 10, 30, 0);

DateTime dateTime = DateTime.now();
int timestamp = dateTime.millisecondsSinceEpoch;

int timestamp = 1642678557000;
DateTime dateTime = DateTime.fromMillisecondsSinceEpoch(timestamp);

DateTime dateTime = DateTime.now();
int year = dateTime.year;
int month = dateTime.month;
int day = dateTime.day;
int hour = dateTime.hour;
int minute = dateTime.minute;
int second = dateTime.second;

DateTime dateTime = DateTime.now();
bool isLeapYear = dateTime.year % 4 == 0 && dateTime.year % 100 != 0 || dateTime.year % 400 == 0;

DateTime dateTime = DateTime.now();
int daysInMonth = DateTime(dateTime.year, dateTime.month + 1, 0).day;

DateTime now = DateTime.now(); // 获取当前日期时间
DateTime monthStart = DateTime(now.year, now.month, 1); // 获取本月第一天的日期时间
DateTime monthEnd = DateTime(now.year, now.month + 1, 0, 23, 59, 59); // 获取本月最后一天的日期时间（时间为23:59:59）

DateTime dateTime = DateTime.now();
String formattedDate = DateFormat('yyyy-MM-dd HH:mm:ss').format(dateTime);

DateTime startDate = DateTime(2022, 1, 1);
DateTime endDate = DateTime(2022, 2, 22);
Duration difference = endDate.difference(startDate); // 计算时间差
int days = difference.inDays; // 计算相差的天数
int hours = difference.inHours; // 计算相差的小时数
int minutes = difference.inMinutes; // 计算相差的分钟数
int seconds = difference.inSeconds; // 计算相差的秒数