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Date compare java fail

while comparing future days it occurs some fail in Java. Look at the code if you can
DateFormat dateFormat = new SimpleDateFormat("yyyy-mm-dd");
Date date = dateFormat.parse("2258-11-01");
Date date1 = dateFormat.parse("2258-10-31");
System.out.println(date.after(date1));
Output is:false
Anyone has idea why it does't work?

The m format represents a minute in the hour. You probably meant to use M, representing the month in the year:
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");

You should use the capital MM for month, overwise it does not parse like you want it to.
new SimpleDateFormat("yyyy-MM-dd");

tl;dr
Use the modern java.time classes to parse your strings that happen to be in standard format.
LocalDate.parse( "2258-11-01" )
.isAfter(
LocalDate.parse( "2258-10-31" )
)
true
Details
As others mentioned, the formatting pattern is case-sensitive, and yours is incorrect.
Another problem, you are inappropriately squeezing a date-only value into a type intended for a date with time-of-day in UTC.
Also, you are using the terrible old date-time classes that were supplanted years ago by the modern java.time classes.
Your input strings happen to comply with the excellent ISO 8601 standard. The java.time classes use these formats by default when parsing/generating strings. So no need to even bother with defining a formatting pattern.
LocalDate ld1 = LocalDate.parse( "2258-11-01" ) ;
LocalDate ld2 = LocalDate.parse( "2258-10-31" ) ;
Compare.
boolean isAfter = ld1.isAfter( ld2 ) ; // true
All this has been covered many many times already on Stack Overflow. Please learn to search Stack Overflow thoroughly before posting.
About java.time
The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.
The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.
To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.
You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.
Where to obtain the java.time classes?
Java SE 8, Java SE 9, Java SE 10, Java SE 11, and later - Part of the standard Java API with a bundled implementation.
Java 9 adds some minor features and fixes.
Java SE 6 and Java SE 7
Most of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
Android
Later versions of Android bundle implementations of the java.time classes.
For earlier Android (<26), the ThreeTenABP project adapts ThreeTen-Backport (mentioned above). See How to use ThreeTenABP….
The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.

find current Date and day after tomorrow's date in java

How to find current date in java. I found a lot but every time i got same command
Date d = new Date(); or something similar
Every such command returns a date of 1970 year.
I fail to understand, Whats the benefit of this getting a date of 1970 ?
Is there any way where i can get current time and add a second into it.
My real purpose is to convert a long value into Date and add a second in it.
5:40:12 should give me 5:40:13 after adding a second.
Any help would be appreciated as i am fed up getting 1970 date.

My real purpose is to convert a long value into Date and add a second in it. 5:40:12 should give me 5:40:13 after adding a second
The troublesome java.util.Date class is now legacy, supplanted by the java.time classes.
Instant.ofEpochMilli( yourLongIntegerGoesHere ) // A moment on the timeline in UTC represented a count of nanoseconds since the epoch of `1970-01-01T00:00:00Z`.
.atZone( ZoneId.of( "Pacific/Auckland" ) // Time zone for the region whose wall-clock time you want to see.
.plusSeconds( 1 )
.toLocalTime() // Extract just the time-of-day without date and without time zone.
.toString() // Generate a string representing the time-of-day value in standard ISO 8601 format.
05:40:13
About java.time
The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.
The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.
To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.
Where to obtain the java.time classes?
Java SE 8, Java SE 9, and later
Built-in.
Part of the standard Java API with a bundled implementation.
Java 9 adds some minor features and fixes.
Java SE 6 and Java SE 7
Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
Android
The ThreeTenABP project adapts ThreeTen-Backport (mentioned above) for Android specifically.
See How to use ThreeTenABP….
The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.

Java.Util.Date class is deprecated, I would recommend using
Java.Util.Calendar instead.
If you're looking to add a second to Current date, try something like this:
Calendar currentTime = Calendar.getInstance(); // gets a calendar using the default time zone and locale.
calendar.add(currentTime.SECOND, 1);
System.out.println(currentTime.getTime());
BUT, the reason why you are receiving a 1970 date when using the Date class is because that class works with milliseconds, so you must multiply the long value by 1000 in order for it to convert to a date, here's an example.
Date currentDate = new Date( YourLongValue * 1000);

Java SWT DateTime: Determine day of Week

I have a DateTime widget with 3/9/2017. Based on the documentation for DateTime, I don't see a way to determine the day of the week. I'll eventually need a string parsed in this format "Wed Feb 22 14:57:34 UTC 2017" from the DateTime widget, but the first step is to get the day of the week. Is there a way to do this outside of making my own function? And if not, what would you recommend as the best approach for the function, since days of the week are not consistent to dates from year to year?
Let me know if you need any addition information.
Thank you!

Use java.util.Calendar:
Calendar c = Calendar.getInstance();
c.setTime(yourDate);
int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);
if you need the output to be Tue rather than 3 (Days of week are indexed starting at 1), instead of going through a calendar, just reformat the string: new SimpleDateFormat("EE").format(date) (EE meaning "day of week, short version")
Documentation

tl;dr
LocalDate.of( 2017 , Month.MARCH , 9 )
.getDayOfWeek()
.getDisplayName( TextStyle.FULL , Locale.ITALY )
Or…
OffsetDateTime.now( ZoneOffset.UTC )
.format( DateTimeFormatter.RFC_1123_DATE_TIME )
java.time
The modern approach uses the java.time classes that supplanted the troublesome old date-time classes.
The DayOfWeek enum defines seven objects, one for each day of the week, Monday-Sunday.
The LocalDate class represents a date-only value without time-of-day and without time zone.
DayOfWeek dow = LocalDate.now().getDayOfWeek() ;
Generate a string of the localized name.
String output = dow.getDisplayName( TextStyle.FULL , Locale.CANADA_FRENCH ) ; // Or Locale.US etc.
To generate your longer string for a moment, use DateTimeFormatter to specify a custom pattern, use a built-in pattern, or automatically localize.
String output = OffsetDateTime.now( ZoneOffset.UTC ).format( DateTimeFormatter.RFC_1123_DATE_TIME ) ;
About java.time
The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.
The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.
To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.
You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.
Where to obtain the java.time classes?
Java SE 8, Java SE 9, and later
Built-in.
Part of the standard Java API with a bundled implementation.
Java 9 adds some minor features and fixes.
Java SE 6 and Java SE 7
Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
Android
Later versions of Android bundle implementations of the java.time classes.
For earlier Android (<26), the ThreeTenABP project adapts ThreeTen-Backport (mentioned above). See How to use ThreeTenABP….
The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.

Using Date to select a string - android studio - java

I'm trying to use a Date String to select a string to be displayed in my android app.
The Code im using to GET Date:
Calendar TextCalendar = Calendar.getInstance();
SimpleDateFormat DateFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.ENGLISH);
String TextDate = DateFormat.format(TextCalendar.getTime());
The Code im imagining I need to select strings:
TextView MyTextView = (TextView) findViewByID(R.id.my_text_view);
MyTextView.setText ( "DateVariable" + "Comment" )
This code I imagine not to work because I tried but, the bit with "DateVariable" And "Comment" means I could have Strings in Strings.xml Named Each Date but I would have 2 Strings for each day because there is a TITLE String and A Comment String, so i could imagine the string names looking like this
<string name="2016-02-28-TITLE">TESTING20160228</string>
<string name="2016-02-28-COMMENT">TESTING20160228Comment</string>
<string name="2016-02-29-TITLE">....
and so on
If anyone has a better suggestion on how to proceed with this it would be greatly appreciated.
Thanks ~Alexander

Try this:
String s = TextDate + "-Comment";
getString(getResources().getIdentifier(s, "string", getPackageName()));

Time Zone
Determining the current date requires a time zone. The date is not simultaneously the same around the world. A new day dawns earlier in the east. For example, in the first few minutes after midnight in Paris, it is still “yesterday” in Montréal.
If omitted, your JVM’s current default time zone is implicitly applied. That default can may vary, even during runtime! Better to be explicit with your desired/expected time zone.
java.time
You are using old date-time classes that have been supplanted by the java.time framework built into Java 8 and later. Much of java.time is back-ported to Java 6 & 7 and further adapted to Android.
These java.time classes include the LocalDate class for date-only values lacking a time-of-day and time zone.
ZoneId z = ZoneId.of( "America/Montreal" );
LocalDate today = LocalDate.now( z );
Your desired textual format complies with the ISO 8601 standard. The java.time classes use ISO 8601 by default when parsing/generating strings.
String output = today.toString() + "-Comment";
Java Naming
By the way, the code in your Question does not follow naming conventions. Class names should start with an uppercase while instance variable names should start with a lowercase.
About java.time
The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.
The Joda-Time project, now in maintenance mode, advises migration to java.time.
To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.
Where to obtain the java.time classes?
Java SE 8 and SE 9 and later
Built-in.
Part of the standard Java API with a bundled implementation.
Java 9 adds some minor features and fixes.
Java SE 6 and SE 7
Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
Android
The ThreeTenABP project adapts ThreeTen-Backport (mentioned above) for Android specifically.
See How to use….
The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.

Java Calendar giving wrong value after parsing month string

I know that Java month begins from 0 and we have to add an offset of 1 to it,but when I use the following code which has a CST time zone,I get value for february month as 6.
I am trying to convert month to its equivalent calendar value such as 1 for January and 2 for Feb and so on.
Calendar cal = Calendar.getInstance();
cal.setTime(new SimpleDateFormat("MMM").parse("FEB"));
int monthInt = cal.get(Calendar.MONTH) + 1;
System.out.println(monthInt);
But when I run it in a machine with time zone as Indian Standard Time(IST-GMT +5.30) I get the expected value as 2.
What is wrong here?Do I need to include any locale to my calendar.I am getting totally meaningless values for months with the above code.

You should instantiate your Calendar with appropriate locales:
Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("IST"),Locale.US);

tl;dr
Month.JANUARY.getValue()
1
Wrong class
You are trying to represent a month using a class that represents a moment. Square peg, round hole.
But when I run it in a machine with time zone as Indian Standard Time(IST-GMT +5.30) I get the expected value as 2.
Again, this occurs because you used the wrong class, a class that represents a moment in the context of a time zone.
I know that Java month begins from 0
Again, you are using the wrong class. This crazy numbering is one of many reasons why the date-time classes bundled with the earliest versions of Java were supplanted by the java.time classes defined by JSR 310 and built into Java 8 and later. Do not use the legacy classes.
Month
The appropriate class for a month is Month. This modern java.time class has sane numbering, unlike the legacy date-time classes that you should avoid.
convert month to its equivalent calendar value such as 1 for January
Use the Month.JANUARY enum object. As for its number, 1-12 for January-December.
int monthNumber = Month.JANUARY.getValue() ;
1
But I suggest you avoid representing a month by a mere integer number. Instead, use Month enum objects throughout your codebase. This makes your code more self-documenting, ensures valid values, and provides type-safety.
Use this:
public void runMonthlyReport( Month month ) { … }
…instead of this:
public void runMonthlyReport( int monthNumber ) { … }
About java.time
The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.
To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.
The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.
You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.
Where to obtain the java.time classes?
Java SE 8, Java SE 9, Java SE 10, Java SE 11, and later - Part of the standard Java API with a bundled implementation.
Java 9 adds some minor features and fixes.
Java SE 6 and Java SE 7
Most of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
Android
Later versions of Android bundle implementations of the java.time classes.
For earlier Android (<26), the ThreeTenABP project adapts ThreeTen-Backport (mentioned above). See How to use ThreeTenABP….
The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.