jsp如何获取当前时间和获取加上一个月后的时间
java中可以这样定义一个公共方法获取系统时间戳:
public static String getFormatDateTime(java.util.Date currDate, String format) {
if (currDate == null) {
return “”;
}
SimpleDateFormat dtFormatdB = null;
try {
dtFormatdB = new SimpleDateFormat(format);
return dtFormatdB.format(currDate);
} catch (Exception e) {
dtFormatdB = new SimpleDateFormat(TIME_FORMAT);
try {
return dtFormatdB.format(currDate);
} catch (Exception ex) {
}
}
return “”;
}
增加一个月后的公共方法:
Calendar cal = Calendar.getInstance();
cal.add(Calendar.MONTH, +1);
用java实现日期类的加减
import java.util.Date;
import java.util.Calendar;
import java.text.SimpleDateFormat;
import java.util.*;
public class CalendarExample {
private static void CalendarTimemethod() {
Date date = Calendar.getInstance().getTime();
System.out.println(“Current date and time is: ” + date);
System.out.println();
}
private static void SimpleDateFormatmethod() {
Calendar date = Calendar.getInstance();
SimpleDateFormat dateformatter = new SimpleDateFormat(
“E yyyy.MM.dd ‘at’ hh:mm:ss a zzz”);
System.out.println(“Current date and time in simple date format: “
+ dateformatter.format(date.getTime()));
System.out.println();
}
private static void Adddates() {
System.out.println(“Performing operations on calendar dates.”);
// Get today’s date
Calendar date = Calendar.getInstance();
Calendar cldr;
SimpleDateFormat dateformatter = new SimpleDateFormat(
“E yyyy.MM.dd ‘at’ hh:mm:ss a zzz”);
cldr = (Calendar) date.clone();
cldr.add(Calendar.DAY_OF_YEAR, -(365 * 2));
System.out.println(“Before two years it was: “
+ dateformatter.format(cldr.getTime()));
cldr = (Calendar) date.clone();
cldr.add(Calendar.DAY_OF_YEAR, +5);
System.out.println(“After five years it will be: “
+ dateformatter.format(cldr.getTime()));
System.out.println();
}
private static void DateDifference() {
System.out.println(“Difference between two dates”);
Date startDate1 = new GregorianCalendar(2005, 02,
25, 14, 00).getTime();
Date endDate1 = new Date();
;
long diff = endDate1.getTime() – startDate1.getTime();
System.out.println(” Difference between ” + endDate1);
System.out.println(” and ” + startDate1 + ” is ” + (diff /
(1000L * 60L * 60L * 24L)) + ” days.”);
System.out.println();
}
private static void Getcalendermethods() {
System.out.println(“Various get methods of the calendar class:”);
Calendar calender = Calendar.getInstance();
System.out.println(“Year : “
+ calender.get(Calendar.YEAR));
System.out.println(“Month : “
+ calender.get(Calendar.MONTH));
System.out.println(“Day of Month : “
+ calender.get(Calendar.DAY_OF_MONTH));
System.out.println(“Day of Week : “
+ calender.get(Calendar.DAY_OF_WEEK));
System.out.println(“Day of Year : “
+ calender.get(Calendar.DAY_OF_YEAR));
System.out.println(“Week of Year : “
+ calender.get(Calendar.WEEK_OF_YEAR));
System.out.println(“Week of Month : “
+ calender.get(Calendar.WEEK_OF_MONTH));
System.out.println(“Day of the Week in Month : “
+ calender.get(Calendar.DAY_OF_WEEK_IN_MONTH));
System.out.println(“Hour : ” + calender.get(Calendar.HOUR));
System.out.println(“AM PM : ” + calender.get(Calendar.AM_PM));
System.out.println(“Hour of the Day : “
+ calender.get(Calendar.HOUR_OF_DAY));
System.out.println(“Minute : ” + calender.get(Calendar.MINUTE));
System.out.println(“Second : ” + calender.get(Calendar.SECOND));
System.out.println();
}
public static void main(String[] args) {
System.out.println();
CalendarTimemethod();
SimpleDateFormatmethod();
Adddates();
DateDifference();
Getcalendermethods();
}
}
以上答案有林氏120烫伤中心提供。稍微再修改下就可以
java中利用Calendar获得月份的时候为什么要加1
Calendar中月份month得取值是从0开始,到11,对应着日历中的1-12月。所以在用此取月份的话,需要在原有基础上加1.
java 日期计算 给一个日期的月份增加几个月怎么算?
Calendar cal = Calendar.getInstance();
先把cal设成某旧日期
cal.setTime(old_date);或者cal.set(Calendar.MONTH, oldMonth);
再加N个月,比如加5个月,
cal.add(Calendar.MONTH,5);
用代码实现使当前日期 Date型的数据增加一个月
1、打开前端编辑软件,新建一个html文件。
2、在代码页面上创建一个点击按钮,然后给这个按钮添加一个获取当前时间的getTime方法,点击该按钮就会触发getTime方法。
3、找到title标签,在这个标签后面新建一个scrtip标签,然后在script标签里创建获取时间的getTime函数,最后使用new Date获取当前的时间。
4、在getTime函数中使用getFullYear()获取当前的年份;使用getMonth()获取当前的月份;使用getDay()获取当前日期。
5、把获取到的年、月、日组合为想要的时间格式,然后使用alert弹出。
6、保存html代码页面,使用浏览器打开,点击获取时间按钮。
怎样用java语句编写用%表示当前月份的上一个月和下一个月
public class Month {
public static void mian(String args[]){
int month=8;
System.out.println(month+”月份的下一个月是”+((month+1)%12)+”月份”);
month=9;
System.out.println(month+”月份的上一个月是”+((month-1)%12)+”月份”);
}
}