Java string to date or date to string & Time increase Day calendar usage

Java string to date or date to string & Time increase Day calendar usagestring to date or date to string

Usage: SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss");

This line is the most important, it established the format of the conversion, YYYY is the full ad year, MM is the month, DD is the date, as for HH:mm:ss, I do not need to explain it again!

PS: Why some format uppercase, some format lowercase, it is afraid to avoid confusion, such as MM is the month, MM is divided; HH is a 24-hour system, and HH is a 12-hour system.

1. String Turn date

2014-07-10 19:20:00 to turn it into a date, you can use date date = Sdf.parse ("2014-07-10 19:20:00");

2. Date Turn string

If you turn today's date into a string, you can use string str = Sdf.format (new date ());

The format of this string content is similar to the 2014-07-10 19:20:00.

With this API we can turn the date into the string format we want, for example, if we want to export the date as July 10, 2014, we can write:

SimpleDateFormat SDF = new SimpleDateFormat ("yyyy mm month DD day");

String str = sdf.format (new Date ());

STR will output in accordance with the format we have set.

A simple example:

Import Java.util.Date;

Import java.text.ParseException;

Import Java.text.SimpleDateFormat;

public class Convertdemo {

/**

* Date converted to string

* @param date

* @return Str

*/

public static String datetostr (date date) {

SimpleDateFormat format = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss");

String str = format.format (date);

return str;

}

/**

* String converted to date

* @param str

* @return Date

*/

public static Date strtodate (String str) {
SimpleDateFormat format = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss");

Date date = null;

try {

Date = Format.parse (str);

} catch (ParseException e) {

E.printstacktrace ();

}

return date;

}

public static void Main (string[] args) {
Date date = new Date ();

System.out.println ("Date to String:" + convertdemo.datetostr (date));

System.out.println ("String to date:" + convertdemo.strtodate (convertdemo.datetostr (date));
}

}

Time increases the use of the calendar day

Package com.hnwt.test;

import java.text.ParsePosition;

import Java.text.SimpleDateFormat;

import Java.util.Calendar;

import java.util.Date;

import Java.util.GregorianCalendar;

Public class Mynew {

Public Static void Main (string[] args) {

SYSTEM.OUT.PRINTLN ("date Added day =" + Addday ("2014-10-10", 1));

}

Public Static String Addday (string s, int N) {

Try {

SimpleDateFormat SDF = new simpledateformat ("Yyyy-mm-dd");

Calendar cd = Calendar.getinstance ();

Cd.settime (Sdf.parse (s));

Cd.add (calendar.date, n);//Add one day

Cd.add (Calendar.month, n);//Add one months

return Sdf.format (Cd.gettime ());

} catch (Exception e) {

return null;

}

}

}