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Convert a String of 6 into mm/dd/yyyy h:m with conditions

I'm developing an API in which one of the object should satisfy the below:
I've a column in Postgress DB as :
input = 201800
Input(column -datatype is character[6]) 201801
.
.
.
201812
Requirement :
Check if the input is current year
check if the last 2 digits are zeros , then ignore
if it is 201802 : dd=01(always), 02(Month) and 2018(year)
after checking the conditions, if it satisfies display like this :
For Ex: input = 201803 then o/p should in MM/DD/YYYY h:m format
Always month is 01 for month in between (01-12),O/P = 01/03/2018 12:00
I tried this, but didn't gibe O/P as per ,y requirement:
public class sample {
public static void main(String[] args) {
try {
String input= "201700" + "00";
SimpleDateFormat sdf1 = new SimpleDateFormat("yyyyMMdd");
Date d = sdf1.parse(input);
System.out.print(d);
String formateDate = new SimpleDateFormat("MM/dd/yyyy hh:mm").format(d);
System.out.print(formateDate);
} catch(Exception e) {}
}
}
Appreciate your help!

I created a method mapDate() that is actually verifying your condition and return the wanted output. You just have to pass the value as parameter to the method. See the example below:
import java.text.SimpleDateFormat;
import java.util.Date;
public class Test {
public static void main(String[] args) {
String result1 = mapDate("201802"+"00");
System.out.print("result: " + result1 + "\n");
String result2 = mapDate("201702"+"02");
System.out.print("result: " + result2 + "\n");
String result3 = mapDate("201802"+"02");
System.out.print("result: " + result3);
}
public static String mapDate(String value){
String myDate;
myDate = "";
SimpleDateFormat format1 = new SimpleDateFormat("yyyy");
String thisYear = format1.format(new Date());
if(!value.substring(value.length() - 2).equals("00") && value.substring(0, 4).equals(thisYear))
myDate = "01/" + value.substring(4, 6) + "/" + value.substring(0, 4) + " 12:00";
return myDate;
}
}
The ouput of this example is:
result:
result:
result: 01/02/2018 12:00

Parameter index out of range (3 > number of parameters, which is 2) error

I get the following error when I try to talk to my SQL database.This method gets two string values from a JSP page. The code gets this weeks dates set by the first int.
However, the problem is when I'm trying to talk to the database. It must be a syntax error. I've tried using different brackets
public String getSpecificSpot(String day, String hour) {
String result = "";
int dayNo= Integer.parseInt(day);
Calendar cal = GregorianCalendar.getInstance();
//System.out.println("Current week = " + Calendar.DAY_OF_WEEK);
// Set the calendar to monday of the current week
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
System.out.println("Current week = " + Calendar.DAY_OF_WEEK);
// Print dates of the current week starting on Monday
DateFormat df = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault());
String monday = "";
monday = df.format(cal.getTime());
//System.out.println(monday);
cal.add(Calendar.DATE, dayNo);
String currentDay = df.format(cal.getTime());
String currentDay2= currentDay;
System.out.println("Current DAY: "+currentDay);
boolean found = false;
Connection c = DBHelperClass.getConnection();
String query = "Select * from timetableslot WHERE date BETWEEN ? 00:00:00.00' AND ? 23:59:59.999' and time= ? ";
if (c != null) {
try {
PreparedStatement inserter = c.prepareStatement(query);
inserter.setString(1, currentDay);
inserter.setString(2, currentDay2);
inserter.setString(3, hour);
System.out.println("validating user: " + query);
ResultSet resultSet = inserter.executeQuery();
while (resultSet.next()) {
//result = resultSet.getInt("classID");
result= String.valueOf(resultSet.getInt("slotID"));
System.out.println(result+" result value");
found = true;
}
} catch (SQLException ex) {
Logger.getLogger(User.class.getName()).log(Level.SEVERE, null, ex);
}
}
//result="ssa";
return result;
}
The error that I get is:
java.sql.SQLException: Parameter index out of range (3 > number of parameters, which is 2).

Hi I have fixed it just after posting the question
public String getSpecificSpot(String day, String hour) {
String result = "";
int dayNo= Integer.parseInt(day);
Calendar cal = GregorianCalendar.getInstance();
//System.out.println("Current week = " + Calendar.DAY_OF_WEEK);
// Set the calendar to monday of the current week
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
System.out.println("Current week = " + Calendar.DAY_OF_WEEK);
// Print dates of the current week starting on Monday
DateFormat df = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault());
String monday = "";
monday = df.format(cal.getTime());
//System.out.println(monday);
cal.add(Calendar.DATE, dayNo);
String currentDay = df.format(cal.getTime());
String currentDay2= currentDay;
System.out.println("Current DAY: "+currentDay);
boolean found = false;
Connection c = DBHelperClass.getConnection();
String query = "Select * from timetableslot WHERE date BETWEEN ? AND ? and time= ? ";
if (c != null) {
try {
PreparedStatement inserter = c.prepareStatement(query);
inserter.setString(1, currentDay + " 00:00:00.00");
inserter.setString(2, currentDay2+ " 23:59:59.999");
inserter.setString(3, hour);
System.out.println("validating user: " + query);
ResultSet resultSet = inserter.executeQuery();
while (resultSet.next()) {
//result = resultSet.getInt("classID");
result= String.valueOf(resultSet.getInt("slotID"));
System.out.println(result+" result value");
found = true;
}
} catch (SQLException ex) {
Logger.getLogger(User.class.getName()).log(Level.SEVERE, null, ex);
}
}
//result="ssa";
return result;
}

Operator '<' cannot be applied to 'java.lang.String'

i got the system time in a string for example something like "1240".
then i wanted to do something like if the system time was < than 1240,then close the application.
but it gives me the "Operator '<' cannot be applied to java.lang.String!" Error!
My code is :
runOnUiThread(new Runnable() {
public void run() {
try{
TextView txtCurrentTime= (TextView)findViewById(R.id.showtime);
Date dt = new Date();
int hours = dt.getHours();
int minutes = dt.getMinutes();
int mynum = 1240;
String curTime = hours + "" + minutes;
txtCurrentTime.setText(curTime);
if(curTime < mynum ){
System.exit(0);
}
}catch (Exception e) {}
}
});
What's the problem?

try{
SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");
String str1 = String.valueOf(hours1) + ":" + String.valueOf(minutes1) + ":" + "00";
String str2 = String.valueOf(hours2) + ":" + String.valueOf(minutes2) + ":" + "00";
Date date1 = formatter.parse(str1);
Date date2 = formatter.parse(str2);
if (date1.compareTo(date2)<0)
{
// if date2 > date1
}
}catch (ParseException e1){
e1.printStackTrace();
}
formats for dates
check date/time format as per your requirement from here

< is not defined for a string and an int of course . So you can't use it .
your current time can be calculated like this :
int curTime = 100*hours + minutes;
then you can use < between two integers.
I believe though you must use System Milliseconds which is more usual.

if(hours * 100 + minutes < mynum){
System.exit(0);
}

How to Compare datetime in Android

I have dates, date1(now) and date2 which is returned in a JSON string say 2016-07-09 21:26:04.
I want to compare those two dates something like
if(date1 < date2){
}

Here is the code to compare two DateTime objects in Android:
public void onDateSelected(DateTime dateSelected) {
DateTime currentDateTime = new DateTime();
try{
// You can use any format to compare by spliting the dateTime
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZZZZZ");
String str1 = dateSelected.toString();
Date selectedDate = formatter.parse(str1);
String str2 = currentDateTime.toString();
Date currentDate = formatter.parse(str2);
if (selectedDate.compareTo(currentDate)<0)
{
System.out.println("current date is Greater than my selected date");
}
else
{
System.out.println("selected date is Greater than my current date");
}
}catch (ParseException e1){
e1.printStackTrace();
}
}

I would do this:
parse the in to Date objects
compare those
Example:
public static void main(String x[]) throws ParseException {
String s1 = "2016-07-09 21:26:04";
String s2 = "2006-07-09 21:26:04";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date d1 = sdf.parse(s1);
Date d2 = sdf.parse(s2);
int compareResult = d1.compareTo(d2);
if (compareResult > 0) {
System.out.println(s1 + " is younger than " + s2);
} else if (compareResult < 0) {
System.out.println(s1 + " is younger than " + s2);
} else {
System.out.println(s1 + " is equals than " + s2);
}
}

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date today= new Date();
try {
if (today.before(sdf.forrmat(json_string_date))) {
// If start date is before end date.
// Do your piece of code
}
}catch (ParseException e) {
e.printStackTrace();
}

java parse date time with milliseconds into date getting parse error

I have a string in which I am finding the datetime with milliseconds as follows:
Calendar now = Calendar.getInstance();
int year = now.get(Calendar.YEAR);
int month = now.get(Calendar.MONTH) + 1; // Note: zero based!
int day = now.get(Calendar.DAY_OF_MONTH);
int hour = now.get(Calendar.HOUR_OF_DAY);
int minute = now.get(Calendar.MINUTE);
int second = now.get(Calendar.SECOND);
int millis = now.get(Calendar.MILLISECOND);
String monthup = String.valueOf(month);
String dayup = String.valueOf(day);
String hourup = String.valueOf(hour);
String minuteup = String.valueOf(minute);
String secondup = String.valueOf(second);
String millisup = String.valueOf(millis);
if(monthup.length()==1){monthup="0"+monthup;}
if(dayup.length()==1){dayup="0"+dayup;}
if(hourup.length()==1){hourup="0"+hourup;}
if(minuteup.length()==1){minuteup="0"+minuteup;}
if(secondup.length()==1){secondup="0"+secondup;}
if(millisup.length()==1){millisup="0"+millisup;}
if(millisup.length()==2){secondup="00"+millisup;}
String timewithmilsec = year+ monthup + dayup+ hourup+ minuteup+ secondup+ millisup;
System.out.println(timewithmilsec);
I am getting a value: 20151020115216690 which is obviousely correct.
I want to parse it to java Date format.
What I did is as follows:
try{
DateFormat formatter = new SimpleDateFormat("yyyyMMdHHmmssaaa");
Date date = formatter.parse(timewithmilsec);
System.out.println(date);
}
catch(Exception e){
System.out.println(e);
}
I am getting an error as follows:
java.text.ParseException: Unparseable date: "20151020115247995"

You have only one d in your format, but are padding the day to two characters, also, according to the JavaDocs...
a Am/pm marker Text PM
which isn't a millisecond place holder, I think you mean SSS
For example...
Calendar now = Calendar.getInstance();
int year = now.get(Calendar.YEAR);
int month = now.get(Calendar.MONTH) + 1; // Note: zero based!
int day = now.get(Calendar.DAY_OF_MONTH);
int hour = now.get(Calendar.HOUR_OF_DAY);
int minute = now.get(Calendar.MINUTE);
int second = now.get(Calendar.SECOND);
int millis = now.get(Calendar.MILLISECOND);
String monthup = String.valueOf(month);
String dayup = String.valueOf(day);
String hourup = String.valueOf(hour);
String minuteup = String.valueOf(minute);
String secondup = String.valueOf(second);
String millisup = String.valueOf(millis);
if (monthup.length() == 1) {
monthup = "0" + monthup;
}
if (dayup.length() == 1) {
dayup = "0" + dayup;
}
if (hourup.length() == 1) {
hourup = "0" + hourup;
}
if (minuteup.length() == 1) {
minuteup = "0" + minuteup;
}
if (secondup.length() == 1) {
secondup = "0" + secondup;
}
if (millisup.length() == 1) {
millisup = "0" + millisup;
}
if (millisup.length() == 2) {
secondup = "00" + millisup;
}
String timewithmilsec = year + monthup + dayup + hourup + minuteup + secondup + millisup;
System.out.println(timewithmilsec);
try {
DateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmssSSS");
Date date = formatter.parse(timewithmilsec);
System.out.println(date);
} catch (Exception e) {
System.out.println(e);
}
Which for me prints
20151020173034124
Tue Oct 20 17:30:34 EST 2015
And while I'm at it, let me introduce you to String.format, which can reduce all you int to String conversion and padding code down to...
String timewithmilsec = String.format("%04d%02d%02d%02d%02d%02d%03d", year, month, day, hour, minute, second, millis);
I am getting Tue Oct 20 12:04:08 IST 2015 but interestingly I did not see any millisecond here
Date#toString won't include the milliseconds by default, you will need to supply a DateFormat which can.
If I replace the last System.out.println with System.out.println(new SimpleDateFormat("dd MMM yyyy HH:mm:ss.SSS").format(date)); it prints something like
20 Oct 2015 17:37:14.856
(for the value 20151020173714856)

According to documentation letter S responds to milliseconds so your format should look like this new SimpleDateFormat("yyyyMMddHHmmssSSS"); (you have one d in your format).

The answer is the missing "d" in the date format, where #MadProgrammer depicts.
In addition, the generation of the string representation of the date should be reconsidered. You should use SimpleDateFormat.format() to generate date string as in the sample code below:
Calendar now = Calendar.getInstance();
DateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmssSSS");
String formattedDate = formatter.format(now.getTime());
System.out.println("Formatted date: " + formattedDate);
And the output will be in a format that you requested.
Formatted date: 20151020094934279