static java.util.Date addDays(java.util.Date date,int amount)
//Adds a number of days to a date returning a new object.
//一个日期对象+n天
static java.util.Date addHours(java.util.Date date,int amount)
//Adds a number of hours to a date returning a new object.
//一个日期对象+n小时
static java.util.Date addMilliseconds(java.util.Date date,int amount)
//Adds a number of milliseconds to a date returning a new object.
//一个日期对象+n毫秒
static java.util.Date addMinutes(java.util.Date date,int amount)
//Adds a number of minutes to a date returning a new object.
//一个日期对象+n分
static java.util.Date addMonths(java.util.Date date,int amount)
//Adds a number of months to a date returning a new object.
//一个日期对象+n月
static java.util.Date addSeconds(java.util.Date date,int amount)
//Adds a number of seconds to a date returning a new object.
//一个日期对象+n秒
static java.util.Date addWeeks(java.util.Date date,int amount)
//Adds a number of weeks to a date returning a new object.
//一个日期对象+N个星期
static java.util.Date addYears(java.util.Date date,int amount)
//Adds a number of years to a date returning a new object.
//一个日期对象+N年
static boolean isSameDay(java.util.Date date1,java.util.Date date2)
//Checks if two date objects are on the same day ignoring time.
//两个日期对象是否相等(只比较年-月-日)
static boolean isSameInstant(java.util.Date date1,java.util.Date date2)
//Checks if two date objects represent the same instant in time.
//比较两个日期是否完全相等(精确到毫秒)
static java.util.Date parseDate(java.lang.String str,java.lang.String[] parsePatterns)
//Parses a string representing a date by trying a variety of different parsers.
//例 :
String[] format={"yyyy-MM-dd"};
System.out.println(DateUtils.parseDate("2009-10-20",format));
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