Common methods of DateUtil in Hutool (formatting date Date2Str, Str2Date, getting the start time and end time of a day, date and time difference)

Hutool format date

Date2Str

Example

String dateStr = "2017-03-01";
Date date = DateUtil.parse(dateStr);

Str2Date

Example

String dateStr = "2017-03-01";
Date date = DateUtil.parse(dateStr);

//结果 2017/03/01
String format = DateUtil.format(date, "yyyy/MM/dd");

//常用格式的格式化，结果：2017-03-01
String formatDate = DateUtil.formatDate(date);

//结果：2017-03-01 00:00:00
String formatDateTime = DateUtil.formatDateTime(date);

//结果：00:00:00
String formatTime = DateUtil.formatTime(date);

Get the start time and end time of the day

Example

String dateStr = "2017-03-01 22:33:23";
Date date = DateUtil.parse(dateStr);

//一天的开始，结果：2017-03-01 00:00:00
Date beginOfDay = DateUtil.beginOfDay(date);

//一天的结束，结果：2017-03-01 23:59:59
Date endOfDay = DateUtil.endOfDay(date);

date time difference

Example

String dateStr1 = "2017-03-01 22:33:23";
Date date1 = DateUtil.parse(dateStr1);

String dateStr2 = "2017-04-01 23:33:23";
Date date2 = DateUtil.parse(dateStr2);

//相差一个月，31天
long betweenDay = DateUtil.between(date1, date2, DateUnit.DAY);

Source
Hutool website