计算两个日期相差多少年
计算两个日期相差多少月
计算两个日期相差多少天
计算两个日期相差多少分钟
计算两个日期相差多少秒
计算两个日期相差多少毫秒
获取当天（不足两位，拼0处理）
获取昨天
获取前天
获取明天
获取后天
获取本周开始
获取本周结束
获取上周开始
获取上周结束
获取本月第一天
获取本月最后一天
获取周几
获取一个月有多少天
class DateUtils {
/**
* 计算两个日期相差多少年
*/
static int daysBetweenYear(DateTime a, DateTime b) {
int v = a.millisecondsSinceEpoch - b.millisecondsSinceEpoch;
return v ~/ 86400000 * 30 * 12;
}
/**
* 计算两个日期相差多少月
*/
static int daysBetweenMonth(DateTime a, DateTime b) {
int v = a.millisecondsSinceEpoch - b.millisecondsSinceEpoch;
return v ~/ 86400000 * 30;
}
/**
* 计算两个日期相差多少天
*/
static int daysBetweenDay(DateTime a, DateTime b) {
int v = a.millisecondsSinceEpoch - b.millisecondsSinceEpoch;
return v ~/ 86400000;
}
/**
* 计算两个日期相差多少分钟
*/
static int daysBetweenMin(DateTime a, DateTime b) {
int v = a.millisecondsSinceEpoch - b.millisecondsSinceEpoch;
return v ~/ 60000;
}
/**
* 计算两个日期相差多少秒
*/
static int daysBetweenSecond(DateTime a, DateTime b) {
int v = a.millisecondsSinceEpoch - b.millisecondsSinceEpoch;
return v ~/ 1000;
}
/**
* 计算两个日期相差多少毫秒
*/
static int daysBetweenMillSecond(DateTime a, DateTime b) {
int v = a.millisecondsSinceEpoch - b.millisecondsSinceEpoch;
return v;
}
/**
* 获取当天（不足两位，拼0处理）
* space 需要拼接日期的字段
*/
static String getYYYYMMDD(DateTime dateTime, String space) {
String year = dateTime.year.toString();
String month = dateTime.month.toString().length == 1
? "0${dateTime.month}"
: dateTime.month.toString();
String day = dateTime.day.toString().length == 1
? "0${dateTime.day}"
: dateTime.day.toString();
return "${year}${space}${month}${space}${day}";
}
/**
* 获取当天（不足两位，拼0处理）
* space 需要拼接日期的字段
*/
static String getYYYYMMDDHHMMSS(DateTime dateTime, String space) {
String year = dateTime.year.toString();
String month = dateTime.month.toString().length == 1
? "0${dateTime.month}"
: dateTime.month.toString();
String day = dateTime.day.toString().length == 1
? "0${dateTime.day}"
: dateTime.day.toString();
String hour = dateTime.hour.toString().length == 1
? "0${dateTime.hour}"
: dateTime.hour.toString();
String minute = dateTime.minute.toString().length == 1
? "0${dateTime.minute}"
: dateTime.minute.toString();
String second = dateTime.second.toString().length == 1
? "0${dateTime.second}"
: dateTime.second.toString();
return "${year}${space}${month}${space}${day} ${hour}${space}${minute}${space}${second}";
}
/**
* 获取昨天
*/
static String getYesterDayYYYYMMDD(DateTime dateTime) {
DateTime yesterDay = new DateTime.fromMillisecondsSinceEpoch(
dateTime.millisecondsSinceEpoch - (24 * 60 * 60 * 1000));
return getYYYYMMDD(yesterDay, "-");
}
/**
* 获取前天
*/
static String getDayBeforeYesterdayDayYYYYMMDD(DateTime dateTime) {
DateTime yesterDay = new DateTime.fromMillisecondsSinceEpoch(
dateTime.millisecondsSinceEpoch - (2 * 24 * 60 * 60 * 1000));
return getYYYYMMDD(yesterDay, "-");
}
/**
* 获取明天
*/
static String getTomorrowDayYYYYMMDD(DateTime dateTime) {
DateTime yesterDay = new DateTime.fromMillisecondsSinceEpoch(
dateTime.millisecondsSinceEpoch + (24 * 60 * 60 * 1000));
return getYYYYMMDD(yesterDay, "-");
}
/**
* 获取后天
*/
static String getTomorrowAcquiredYYYYMMDD(DateTime dateTime) {
DateTime yesterDay = new DateTime.fromMillisecondsSinceEpoch(
dateTime.millisecondsSinceEpoch + (2 * 24 * 60 * 60 * 1000));
return getYYYYMMDD(yesterDay, "-");
}
/**
* 获取本周开始
*/
static String getWeekFirstDayYYYYMMDD(DateTime dateTime) {
int current = dateTime.weekday;
DateTime firstDay = new DateTime.fromMillisecondsSinceEpoch(
dateTime.millisecondsSinceEpoch -
(24 * 60 * 60 * 1000 * (current - 1)));
return getYYYYMMDD(firstDay, "-");
}
/**
* 获取本周结束
*/
static String getWeekLastDayYYYYMMDD(DateTime dateTime) {
int current = dateTime.weekday;
DateTime lastDay = new DateTime.fromMillisecondsSinceEpoch(
dateTime.millisecondsSinceEpoch +
(24 * 60 * 60 * 1000 * (7 - current)));
return getYYYYMMDD(lastDay, "-");
}
/**
* 获取上周开始
*/
static String getLastWeekFirstDayYYYYMMDD(DateTime dateTime) {
int current = dateTime.weekday;
DateTime firstDay = new DateTime.fromMillisecondsSinceEpoch(
dateTime.millisecondsSinceEpoch -
(24 * 60 * 60 * 1000 * (current - 1)));
DateTime day = new DateTime.fromMillisecondsSinceEpoch(
firstDay.millisecondsSinceEpoch - (24 * 60 * 60 * 1000 * 7));
return getYYYYMMDD(day, "-");
}
/**
* 获取上周结束
*/
static String getLastWeekLastDayYYYYMMDD(DateTime dateTime) {
int current = dateTime.weekday;
DateTime lastDay = new DateTime.fromMillisecondsSinceEpoch(
dateTime.millisecondsSinceEpoch +
(24 * 60 * 60 * 1000 * (7 - current)));
DateTime day = new DateTime.fromMillisecondsSinceEpoch(
lastDay.millisecondsSinceEpoch - (24 * 60 * 60 * 1000 * 7));
return getYYYYMMDD(day, "-");
}
/**
* 获取本月第一天
*/
static String getMonthFirstDayYYYYMMDD(DateTime dateTime, String space) {
String year = "${DateTime.now().year}";
String month = "${DateTime.now().month}".length == 1
? "0${DateTime.now().month}"
: "${DateTime.now().month}";
return "${year}${space}${month}${space}01";
}
/**
* 获取本月最后一天
*/
static String getMonthLastDayYYYYMMDD(DateTime dateTime, String space) {
String year = "${DateTime.now().year}";
String month = "${DateTime.now().month}".length == 1
? "0${DateTime.now().month}"
: "${DateTime.now().month}";
int d = getDayCounts(DateTime.now().month);
return "${year}${space}${month}${space}${d}";
}
/**
* 获取周几
*/
static String getWeekday(DateTime dateTime) {
if (dateTime == null) return null;
String weekday;
switch (dateTime.weekday) {
case 1:
weekday = '星期一';
break;
case 2:
weekday = '星期二';
break;
case 3:
weekday = '星期三';
break;
case 4:
weekday = '星期四';
break;
case 5:
weekday = '星期五';
break;
case 6:
weekday = '星期六';
break;
case 7:
weekday = '星期日';
break;
default:
break;
}
return weekday;
}
/**
* 获取一个月有多少天
*/
static int getDayCounts(int month) {
int year = DateTime.now().year;
int end = 0;
if (month == 1) {
end = 31;
} else if (month == 2) {
if ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0)) {
end = 29;
} else {
end = 28;
}
} else if (month == 3) {
end = 31;
} else if (month == 4) {
end = 30;
} else if (month == 5) {
end = 31;
} else if (month == 6) {
end = 30;
} else if (month == 7) {
end = 31;
} else if (month == 8) {
end = 31;
} else if (month == 9) {
end = 30;
} else if (month == 10) {
end = 31;
} else if (month == 11) {
end = 30;
} else if (month == 12) {
end = 31;
}
return end;
}
}
