下面的方法可以得到三天前的具体时间-->
Date start=new Date();//取时间
Calendar calendar = new GregorianCalendar();
calendar.setTime(start);
calendar.add(calendar.DATE,-3);//把日期往前推3天
start=calendar.getTime();
我们的用Gson转化的Date类型数据到前台会转化为一个时间戳: new Gson().toJson(对象索引)
也可以使用普遍的转换方法--> Date date = new Date();
SimpleDateFormat formate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String todayTime = formate.format(date);
下面介绍一个神奇的时间工具类:
package com.jd.ecc.commons.lib.utils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class DateFormatUtil {
private static final String DATE_FORMAT = "yyyy-MM-dd";
private static final String DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
private static final String YEAR_MONTH_FORMAT = "yyyy-MM";
public DateFormatUtil() {
}
public static boolean isValidDate(String dateStr) {
return validFormat(dateStr, "yyyy-MM-dd");
}
public static boolean isValidDate(String datetStr, String dateFormat) {
return validFormat(datetStr, dateFormat);
}
public static boolean isValidDateTime(String datetimeStr) {
return validFormat(datetimeStr, "yyyy-MM-dd HH:mm:ss");
}
public static boolean isValidDateTime(String datetimeStr, String datetimeFormat) {
return validFormat(datetimeStr, datetimeFormat);
}
public static boolean validFormat(String str, String format) {
boolean convertSuccess = true;
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
try {
simpleDateFormat.setLenient(false);
Date e = simpleDateFormat.parse(str);
Date maxDate = simpleDateFormat.parse("9999-12-31");
if(e.after(maxDate)) {
convertSuccess = false;
}
} catch (ParseException var6) {
convertSuccess = false;
}
return convertSuccess;
}
public static String getTodayTime() {
Date date = new Date();
SimpleDateFormat formate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String todayTime = formate.format(date);
return todayTime;
}
public static String getTodatDate() {
Date date = new Date();
SimpleDateFormat formate = new SimpleDateFormat("yyyy-MM-dd");
String todayDate = formate.format(date);
return todayDate;
}
public static String getYesterdayDate() {
Date date = new Date();
GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(date);
calendar.add(5, -1);
date = calendar.getTime();
SimpleDateFormat formate = new SimpleDateFormat("yyyy-MM-dd");
String yesterdayDate = formate.format(date);
return yesterdayDate;
}
public static String getYesterdayTime() {
Date date = new Date();
GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(date);
calendar.add(5, -1);
date = calendar.getTime();
SimpleDateFormat formate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String yesterdayTime = formate.format(date);
return yesterdayTime;
}
public static String getNowMonth() {
Date d = new Date();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM");
String nowMonth = df.format(d);
System.out.println(nowMonth);
return nowMonth;
}
public static String getLastMonth() {
GregorianCalendar cd = new GregorianCalendar();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM");
int validMonth = cd.get(2) - 1;
cd.set(2, validMonth);
Date dt = cd.getTime();
String lastMonth = df.format(dt);
return lastMonth;
}
public static String getTodayBeginTime() {
GregorianCalendar cd = new GregorianCalendar();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
cd.set(11, 0);
cd.set(12, 0);
cd.set(13, 0);
Date dt = cd.getTime();
String todayBeginTime = df.format(dt);
return todayBeginTime;
}
public static String getTodayEndTime() {
GregorianCalendar cd = new GregorianCalendar();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
cd.set(11, 23);
cd.set(12, 59);
cd.set(13, 59);
Date dt = cd.getTime();
String todayEndTime = df.format(dt);
return todayEndTime;
}
public static String getYesterdayBeginTime() {
GregorianCalendar cd = new GregorianCalendar();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
int yesterday = cd.get(5) - 1;
cd.set(5, yesterday);
cd.set(11, 0);
cd.set(12, 0);
cd.set(13, 0);
Date dt = cd.getTime();
String yesterdayBeginTime = df.format(dt);
return yesterdayBeginTime;
}
public static String getYesterdayEndTime() {
GregorianCalendar cd = new GregorianCalendar();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
int yesterday = cd.get(5) - 1;
cd.set(5, yesterday);
cd.set(11, 23);
cd.set(12, 59);
cd.set(13, 59);
Date dt = cd.getTime();
String yesterdayEndTime = df.format(dt);
return yesterdayEndTime;
}
public static String getNowMonthBeginTime() {
GregorianCalendar cd = new GregorianCalendar();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
cd.add(2, 0);
cd.set(5, 1);
cd.set(11, 0);
cd.set(12, 0);
cd.set(13, 0);
Date dt = cd.getTime();
String nowMonthBeginTime = df.format(dt);
return nowMonthBeginTime;
}
public static String getNowMonthBeginDate() {
GregorianCalendar cd = new GregorianCalendar();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
cd.add(2, 0);
cd.set(5, 1);
Date dt = cd.getTime();
String nowMonthBeginDate = df.format(dt);
return nowMonthBeginDate;
}
public static String getNowMonthEndTime() {
Calendar ca = Calendar.getInstance();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
ca.set(5, ca.getActualMaximum(5));
ca.set(11, 23);
ca.set(12, 59);
ca.set(13, 59);
String nowMonthEndTime = df.format(ca.getTime());
return nowMonthEndTime;
}
public static String getNowMonthEndDate() {
Calendar ca = Calendar.getInstance();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
ca.set(5, ca.getActualMaximum(5));
String nowMonthEndDate = df.format(ca.getTime());
return nowMonthEndDate;
}
public static String getLastMonthBeginTime() {
GregorianCalendar cd = new GregorianCalendar();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
cd.add(2, -1);
cd.set(5, 1);
cd.set(11, 0);
cd.set(12, 0);
cd.set(13, 0);
Date dt = cd.getTime();
String lastMonthBeginTime = df.format(dt);
return lastMonthBeginTime;
}
public static String getLastMonthBeginDate() {
GregorianCalendar cd = new GregorianCalendar();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
cd.add(2, -1);
cd.set(5, 1);
Date dt = cd.getTime();
String lastMonthBeginDate = df.format(dt);
return lastMonthBeginDate;
}
public static String getLastMonthEndTime() {
GregorianCalendar cd = new GregorianCalendar();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
cd.set(5, 0);
cd.set(11, 23);
cd.set(12, 59);
cd.set(13, 59);
Date dt = cd.getTime();
String lastMonthEndTime = df.format(dt);
return lastMonthEndTime;
}
public static String getLastMonthEndDate() {
GregorianCalendar cd = new GregorianCalendar();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
cd.set(5, 0);
Date dt = cd.getTime();
String lastMonthEndDate = df.format(dt);
return lastMonthEndDate;
}
public static String getAfterDaysTime(Integer dateLen) {
GregorianCalendar cd = new GregorianCalendar();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
cd.add(5, dateLen.intValue());
cd.set(11, 23);
cd.set(12, 59);
cd.set(13, 59);
Date dt = cd.getTime();
String afterThirtyDaysDate = df.format(dt);
return afterThirtyDaysDate;
}
public static String getNowWeekBeginTime() {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar cds = Calendar.getInstance();
cds.setFirstDayOfWeek(2);
cds.set(11, 0);
cds.set(12, 0);
cds.set(13, 0);
cds.set(7, 2);
String thisweekstart = df.format(cds.getTime());
return thisweekstart;
}
public static String getNowWeekEndTime() {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar cde = Calendar.getInstance();
cde.setFirstDayOfWeek(2);
cde.set(11, 23);
cde.set(12, 59);
cde.set(13, 59);
cde.set(7, 1);
String thisweekend = df.format(cde.getTime());
return thisweekend;
}
public static String getLastWeekBeginTime() {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar cdl = Calendar.getInstance();
cdl.setFirstDayOfWeek(2);
cdl.add(4, -1);
cdl.set(7, 1);
cdl.set(11, 0);
cdl.set(12, 0);
cdl.set(13, 0);
cdl.set(7, 2);
String lastweekstart = df.format(cdl.getTime());
return lastweekstart;
}
public static String getLastWeekEndTime() {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar cdle = Calendar.getInstance();
cdle.setFirstDayOfWeek(2);
cdle.add(4, -1);
cdle.set(7, 1);
cdle.set(11, 23);
cdle.set(12, 59);
cdle.set(13, 59);
String lastweekend = df.format(cdle.getTime());
return lastweekend;
}
public static String getThreeMonthAgoTime() {
new Date();
Calendar cald = Calendar.getInstance();
cald.add(2, -3);
Date date = cald.getTime();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String threeMonthAgoTime = df.format(date);
return threeMonthAgoTime;
}
public static String getThreeMonthAgoDate() {
new Date();
Calendar cald = Calendar.getInstance();
cald.add(2, -3);
Date date = cald.getTime();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
String threeMonthAgoDate = df.format(date);
return threeMonthAgoDate;
}
}功能简介-->
方法返回类型
方法名称
方法含义
方法返回类型
方法名称
方法含义
booleanisValidDate(String
dateStr)根据默认格式校验日期booleanisValidDate(String
datetStr, String dateFormat)自定义格式校验日期booleanisValidDateTime(String
datetimeStr)根据默认格式校验时间booleanisValidDateTime(String
datetimeStr, String datetimeFormat)自定义格式校验时间booleanvalidFormat(String
str, String format)格式校验抽象方法StringgetTodayTime()获得今天具体时间StringgetTodatDate()获得今天日期StringgetYesterdayDate()获得昨天日期StringgetYesterdayTime()获得昨天具体时间StringgetNowMonth()获取当前月StringgetLastMonth()获取上一个月StringgetTodayBeginTime()获取当天的开始时间StringgetTodayEndTime获取当天的结束时间StringgetYesterdayBeginTime()获取前一天的开始时间StringgetYesterdayEndTime()获取前一天的结束时间StringgetNowMonthBeginTime()获得当前月的第一天开始时间StringgetNowMonthBeginDate()获得当前月的第一天开始日期StringgetNowMonthEndTime()获得当前月最后一天结束时间StringgetNowMonthEndDate()获得当前月最后一天结束日期StringgetLastMonthBeginTime()获得前一月的第一天开始时间StringgetLastMonthBeginDate()获得前一月的第一天开始日期StringgetLastMonthEndTime()获得前一月的最后一天结束时间StringgetLastMonthEndDate()获得前一月的最后一天结束日期StringgetAfterDaysTime(Integer
dateLen)获得当前时间后X天之后的结束时间StringgetNowWeekBeginTime()获得本周开始时间StringgetNowWeekEndTime()获得本周结束时间StringgetLastWeekBeginTime()获得上周开始时间StringgetLastWeekEndTime()获得上周结束时间StringgetThreeMonthAgoTime()获得3个月前时间StringgetThreeMonthAgoDate()获得3个月前日期
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