org.apache.commons.lang.DateUtils
static java.util.DateaddDays (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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