validate a date format in (mm/yyyy) type in java

validate a date format in (mm/yyyy) type in java

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regular expression for date format dd-mmm-yyyy in java
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how to validate date format MM/YYYY as String example-

09/20 false

13/5651 false

3/2104 true

03/2010 true


Java Date Validation Example, In this example, we are checking whether a given date is valid or not. In the method validateJavaDate(String) we have specified the date format as “MM/dd/​yyyy”  Write code to validate it using the following rules: It should be a valid time in 12 hrs format. If the given time is as per the given rules then return 1 else return -1.If the value returned is 1 then print as valid time else print as Invalid time.


What you want is a customized method because you place special constraints to the validity of the date. The following passed all your 4 examples:

public static boolean validDate(String date) {
    date = date.trim();
    if (date.length() < 6)
        return false;

    String[] parts = date.split("/");
    if (parts.length != 2)
        return false;

    int month = 0;
    try {
        month = Integer.parseInt(parts[0]);
    } catch (NumberFormatException e) {
        e.printStackTrace();
        return false;
    }
    if (month < 1 || month > 12)
        return false;

    int year = 0;
    try {
        year = Integer.parseInt(parts[1]);
    } catch (NumberFormatException e) {
        e.printStackTrace();
        return false;
    }
    if (year < 1000)
        return false;

    return true;
}

public static void main(String[] args) {
    String s1 = "09/20";
    String s2 = "13/5651";
    String s3 = "3/2104";
    String s4 = "03/2010";

    System.out.println(s1 + " " + validDate(s1));
    System.out.println(s2 + " " + validDate(s2));
    System.out.println(s3 + " " + validDate(s3));
    System.out.println(s4 + " " + validDate(s4));
}

will print:

09/20 false
13/5651 false
3/2104 true
03/2010 true

I'm not sure about this part:

if (year < 1000)
    return false;

you can change it if you like.

Check If a String Is a Valid Date in Java, The input contains the date in a valid format, such as MM/DD/YYYY; The various parts of First, let's write an interface for the date validation: ? The input contains the date in a valid format, such as MM/DD/YYYY; The various parts of the input are in a valid range; The input resolves to a valid date in the calendar; We can use regular expressions to do the above. However, regular expressions to handle various input formats and locales are complex and error-prone.


Try this function, which returns true if the date is valid or false otherwise:

static boolean validateDate(String date){
    String [] split_date = date.split("/");
    //update year bounds accordingly
    int min_year = 1900;
    int max_year = 2200;
    try{
        int month = Integer.parseInt(split_date[0]);
        int year = Integer.parseInt(split_date[1]);
        if (month < 1 || month > 12){
            return false;
        }
        if (year < min_year || year > max_year){
            return false;
        }
    } catch (NumberFormatException e) {
        return false;
    }
    return true;
}

Or this function to validate future dates:

import java.util.Calendar;

static boolean validateDate(String date){
    String [] split_date = date.split("/");
    int curr_month = Calendar.getInstance().get(Calendar.MONTH);
    int curr_year = Calendar.getInstance().get(Calendar.YEAR);
    try{
        int month = Integer.parseInt(split_date[0]);
        int year = Integer.parseInt(split_date[1]);
        if (year < curr_year){
            return false;
        }
        if (month < 1 || month > 12){
            return false;
        }
        if (year == curr_year){
            if (month <= curr_month){
                return false;
            }
        }
    } catch (NumberFormatException e) {
        return false;
    }
    return true;
}

Java date validation using RegEx, In this Java date validation example using regex, we will learn to validate simple date formats such as mm/dd/yy, mm/dd/yyyy with or without leading zeros. In this Java date validation using regex, we will learn to validate simple date formats such as mm/dd/yy, mm/dd/yyyy, dd/mm/yy and dd/mm/yyyy.Here we want to use a regex that simply checks whether the input is a valid date without trying to eliminate things such as February 31st.


public boolean isThisDateValid(String dateToValidate, String dateFromat){

    if(dateToValidate == null){
        return false;
    }

    SimpleDateFormat sdf = new SimpleDateFormat(dateFromat);
    sdf.setLenient(false);

    try {

        //if not valid, it will throw ParseException
        Date date = sdf.parse(dateToValidate);
        System.out.println(date);

    } catch (ParseException e) {

        e.printStackTrace();
        return false;
    }

    return true;
}

Referensi https://www.mkyong.com/java/how-to-check-if-date-is-valid-in-java/

Java, Java | Date format validation using Regex. We use /dd/mm/yyyy If you like GeeksforGeeks and would like to contribute, you can also write an article using  Java Date Validation: Checks whether a Date is valid or not In this example, we are checking whether a given date is valid or not. In the method validateJavaDate(String) we have specified the date format as “MM/dd/yyyy” that’s why only the date passed in this format is shown as valid in the output.


How to check if date is valid in Java, In Java, you can use SimpleDateFormat class to check if a provided date is valid. isThisDateValid(null, "dd/MM/yyyy")); } @Test public void  This code will validate date format DD/MM/YY You can use attributes of html tag instead of validation from html input type ="date" can be used instead of


Validate a Date in Java, In this post, we will discuss various ways to validate a date in Java. We can use OWASP Validation Regex to check for a Date in US format with leap years dd-mm-yy or dd/mm/yy or or dd.mm.yy are valid. String[] dates = {"01/13/2010",  The above regular expression is used to validate the date format in “dd/mm/yyyy”, you can easy customize to suit your need. However, it’s a bit hard to validate the leap year , 30 or 31 days of a month, we may need basic logic as below.


SimpleDateFormat, Type · Normalizer2. javax.xml.validation java.text.Format. ↳, java.text.​DateFormat. ↳, java.text.SimpleDateFormat So using the pattern "MM/dd/yyyy", "01/11/12" parses to Jan 11, 12 A.D.; For parsing with the For example, using a pattern of "MM/dd/yy" and a SimpleDateFormat instance created on Jan 1, 1997, the  Assuming we want to validate date in yyyy-mm-dd format, we will need 4 digits followed by -, then 2 digits for month followed by – and then 2 digits for day. So our pattern will be like \\d{4}-\\d{2}-\\d{2} .