判断日期是否是明天，今天，昨天

读取日期的格式

 public static SimpleDateFormat getDateFormat() {if (null == DateLocal.get()) {DateLocal.set(new SimpleDateFormat("yyyy年MM月dd日", Locale.CHINA));}return DateLocal.get();}

判断是否为昨天(效率比较高)

    public static boolean IsYesterday(String day) throws ParseException {Calendar pre = Calendar.getInstance();Date predate = new Date(System.currentTimeMillis());pre.setTime(predate);Calendar cal = Calendar.getInstance();Date date = getDateFormat().parse(day);cal.setTime(date);if (cal.get(Calendar.YEAR) == (pre.get(Calendar.YEAR))) {int diffDay = cal.get(Calendar.DAY_OF_YEAR)- pre.get(Calendar.DAY_OF_YEAR);if (diffDay == YESTERDY) {return true;}}return false;}

判断是否为今天

public static boolean IsToday(String day) throws ParseException {Calendar pre = Calendar.getInstance();Date predate = new Date(System.currentTimeMillis());pre.setTime(predate);Calendar cal = Calendar.getInstance();Date date = getDateFormat().parse(day);cal.setTime(date);if (cal.get(Calendar.YEAR) == (pre.get(Calendar.YEAR))) {int diffDay = cal.get(Calendar.DAY_OF_YEAR)- pre.get(Calendar.DAY_OF_YEAR);if (diffDay == TODAY) {return true;}}return false;}

判断是否为明天

    public static boolean IsTomorrowday(String day) throws ParseException {Calendar pre = Calendar.getInstance();Date predate = new Date(System.currentTimeMillis());pre.setTime(predate);Calendar cal = Calendar.getInstance();Date date = getDateFormat().parse(day);cal.setTime(date);if (cal.get(Calendar.YEAR) == (pre.get(Calendar.YEAR))) {int diffDay = cal.get(Calendar.DAY_OF_YEAR)- pre.get(Calendar.DAY_OF_YEAR);if (diffDay == TOMORROWDAT) {return true;}}return false;}

以下为整体代码：

package com.example.addda.addd;import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;/*** Created by scq on 17-03-03.*/
public class DayUtils {private static final int YESTERDY = -1;private static final int TODAY = 0;private static final int TOMORROWDAT = 1;private static final int OTHER_DAY = 10000;private static ThreadLocal<SimpleDateFormat> DateLocal = new ThreadLocal<SimpleDateFormat>();/*** 读取日期的格式*/public static SimpleDateFormat getDateFormat() {if (null == DateLocal.get()) {DateLocal.set(new SimpleDateFormat("yyyy年MM月dd日", Locale.CHINA));}return DateLocal.get();}/*** 调用显示日期*/public static String getTitleDay(String day){try {/*boolean isToday;boolean isYesterday;boolean isTomorrowday;isToday = IsToday(day);isYesterday = IsYesterday(day);isTomorrowday = IsTomorrowday(day);if(isToday){return "今天";}else if(isYesterday){return "昨天";}else if(isTomorrowday){return "明天";}else{return day;}*/switch (JudgmentDay(day)) {case YESTERDY : {return "今天";}case TODAY : {return "昨天";}case TOMORROWDAT : {return "明天";}default:return day;}} catch (ParseException e) {e.printStackTrace();}return null;}/*** 判断日期(效率比较高)*/public static int JudgmentDay(String day) throws ParseException {Calendar pre = Calendar.getInstance();Date predate = new Date(System.currentTimeMillis());pre.setTime(predate);Calendar cal = Calendar.getInstance();Date date = getDateFormat().parse(day);cal.setTime(date);if (cal.get(Calendar.YEAR) == (pre.get(Calendar.YEAR))) {int diffDay = cal.get(Calendar.DAY_OF_YEAR)- pre.get(Calendar.DAY_OF_YEAR);switch (diffDay) {case YESTERDY : {return YESTERDY;}case TODAY : {return TODAY;}case TOMORROWDAT : {return TOMORROWDAT;}}}return OTHER_DAY;}/*** 判断是否为昨天(效率比较高)* @param day 传入的 时间  "2016-06-28 10:10:30" "2016-06-28" 都可以* @return true昨天 false不是* @throws ParseException*/public static boolean IsYesterday(String day) throws ParseException {Calendar pre = Calendar.getInstance();Date predate = new Date(System.currentTimeMillis());pre.setTime(predate);Calendar cal = Calendar.getInstance();Date date = getDateFormat().parse(day);cal.setTime(date);if (cal.get(Calendar.YEAR) == (pre.get(Calendar.YEAR))) {int diffDay = cal.get(Calendar.DAY_OF_YEAR)- pre.get(Calendar.DAY_OF_YEAR);if (diffDay == YESTERDY) {return true;}}return false;}/*** 判断是否为今天(效率比较高)* @param day 传入的 时间  "2016-06-28 10:10:30" "2016-06-28" 都可以* @return true今天 false不是* @throws ParseException*/public static boolean IsToday(String day) throws ParseException {Calendar pre = Calendar.getInstance();Date predate = new Date(System.currentTimeMillis());pre.setTime(predate);Calendar cal = Calendar.getInstance();Date date = getDateFormat().parse(day);cal.setTime(date);if (cal.get(Calendar.YEAR) == (pre.get(Calendar.YEAR))) {int diffDay = cal.get(Calendar.DAY_OF_YEAR)- pre.get(Calendar.DAY_OF_YEAR);if (diffDay == TODAY) {return true;}}return false;}/*** 判断是否为明天(效率比较高)* @param day 传入的 时间  "2016-06-28 10:10:30" "2016-06-28" 都可以* @return true明天 false不是* @throws ParseException*/public static boolean IsTomorrowday(String day) throws ParseException {Calendar pre = Calendar.getInstance();Date predate = new Date(System.currentTimeMillis());pre.setTime(predate);Calendar cal = Calendar.getInstance();Date date = getDateFormat().parse(day);cal.setTime(date);if (cal.get(Calendar.YEAR) == (pre.get(Calendar.YEAR))) {int diffDay = cal.get(Calendar.DAY_OF_YEAR)- pre.get(Calendar.DAY_OF_YEAR);if (diffDay == TOMORROWDAT) {return true;}}return false;}
}

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