Java Date type conversions

Import Java.sql.Timestamp;
Import Java.text.SimpleDateFormat;
Import Java.util.Calendar;
Import Java.util.Date;


Import Java.util.GregorianCalendar; 
/** * Tool class for type conversions associated with the date type * * @author vinegar * */public class Dateswitch {/** * Convert calendar type to string type required seconds * * @param Switchcalendar */public static String switchstring (Calendar cal) {//TODO auto-generated method stub Simpledat
Eformat df = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss");
String datestr = Df.format (Cal.gettime ());
return datestr; /** * Convert String type to Calendar type required seconds * * @param str * @return/public static Calendar Switchcalendar (String str) {/
/TODO auto-generated Method stub String time=str.substring (0, ten) + "" +str.substring (11, 18);
Calendar cal = new GregorianCalendar ();
Date data = null;
SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss"); try {data = Sdf.parse (time);//System.out.println (data);} catch (Exception e) {e.printstacktrace ();} cal.settime (Data
); System.out.println (CAL);
Return cal; 
/** * Convert a String type to a Calendar type no time seconds * * @param str * @return/public static Calendar SwitchCalendar2 (String str) {
TODO auto-generated Method stub Calendar cal = new GregorianCalendar ();
Date data = null;
SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd"); try {data = Sdf.parse (str);//System.out.println (data);} catch (Exception e) {e.printstacktrace ();} cal.settime (data)
;
System.out.println (CAL);
Return cal; /** * Convert calendar type to java.sql.Date type * * @param cal * @return/public static java.sql.Date switchsqldate (Calendar CA
L) {Date date = Cal.gettime ();
Timestamp datetime = new Timestamp (Date.gettime ());
Java.sql.Date time = new Java.sql.Date (Datetime.gettime ());
System.out.println (time);
return time; /** * Get the day before the current date * * @return/public static String Catchbeforeday () {//Get the day before the current date System.currenttimemillis () -24*6
0*60*1000 (milliseconds of the day) Date date = new Date (System.currenttimemillis ()-86400000); System.out.println ("Current day:" +system.cUrrenttimemillis ());
System.out.println ("day Before:" + (System.currenttimemillis ()-86400000));
Java.text.SimpleDateFormat SDF = new Java.text.SimpleDateFormat ("Yyyy-mm-dd");
String time = Sdf.format (date);
return time; /** * Day Date * * @return/public static String Catchday () {java.util.Date date = new Java.util.Date (); Java.text.Sim
Pledateformat SDF = new Java.text.SimpleDateFormat ("Yyyy-mm-dd");
String time = Sdf.format (date);
System.out.println ("Today's Date:" +time);
return time; /** * Get the day after the current date * * @return/public static String Catchlaterday () {//Get the day after the current date System.currenttimemillis () -24*60
*60*1000 (number of milliseconds in a day) java.util.Date Date = new Java.util.Date (System.currenttimemillis () + 86400000);
System.out.println ("Current day:" +system.currenttimemillis ());
System.out.println ("Day after:" + (System.currenttimemillis ()-86400000));
Java.text.SimpleDateFormat SDF = new Java.text.SimpleDateFormat ("Yyyy-mm-dd");
String time = Sdf.format (date);
System.out.println ("Tomorrow's Date:" +time);
return time; }


/**
*Get the last day of the current month * * @return/public static String Catchlastday () {Calendar cal = Calendar.getinstance ();//Set Date to first day of the month Cal
. Set (calendar.date, 1);
Date rolls back one day, the last day Cal.roll (Calendar.date,-1);
Gets the number of days of the current month int maxday = Cal.get (calendar.date);
Gets the current month int nowmonth = Cal.get (calendar.month) + 1;
String Nowmonth;
if (Nowmonth <) {Nowmonth = "0" + nowmonth;} else {nowmonth = Nowmonth + "";}
Gets the current year int nowyear = Cal.get (calendar.year);
StringBuilder sb = new StringBuilder ();
For stitching Sb.append (nowyear). Append ("-"). Append (Nowmonth). Append ("-"). Append (Maxday);
System.out.println (Sb.tostring ());
return sb.tostring (); /** * Show Time * @param times * @return/public static String ShowTime (long time) {long hour = hour/(* * 1000); Lo
ng minute = (Time-hour * 60 * 60 * 1000)/(60 * 1000);
Long second = (time-hour * * 1000-minute * 60 * 1000)/1000;
if (second >=) {second = second%/minute + = SECOND/60;} if (minute >=) {minute = minute% 60;Hour + = MINUTE/60;
String OK = hour + "hours" + Minute + "min" + second + "seconds";
return OK; /** * String type converted to java.util.Date type * @param string * @return * @throws Exception/public static Date Stringswitchudate
(String string) throws Exception {SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss");
Date time = Sdf.parse (string);
return time; /** * Get the last day of the current month * * @return/public static date Lastday () {Calendar cal = Calendar.getinstance ();//Set Date to the first day of the month CA
L.set (calendar.date, 1);

Date rolls back one day, the last day Cal.roll (Calendar.date,-1);
Date Date=cal.gettime ();
System.out.println ("Riqi:" +date);
return date; /** * Get next month * * @return/public static date Catchnextmonthday () {Calendar cal = Calendar.getinstance ();//Set Date to
The first day of the month Cal.set (calendar.date, 1);


Set the month to the next month of the current month Cal.add (Calendar.month, 1);
Date date = Cal.gettime ();
return date; /** * Get current date 31 days after date * * @return/public static date Catchnext31day (date date) {Calendar cal = Calendar.getinstance ()
; Cal.settiMe (date);
Cal.roll (Calendar.month, 1);
Cal.roll (calendar.date, 1);
Date newdate = Cal.gettime ();
return newdate;
 }
}