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I have a date like 24May2018 and want to change it to 24-05-2018. I tried using SimpleDateFormat but it is throwing UnParseable Date. I have tried the following code:-

SimpleDateFormat inputDate=new SimpleDateFormat("ddMMyyyy",Locale.US);
SimpleDateFormat outputDate=new SimpleDateFormat("dd-MM-yyyy",Locale.US);
Date parseFormat=new SimpleDateFormat
Date date=inputDate.parse(val);

The InputFormat must be:

SimpleDateFormat inputDate=new SimpleDateFormat("ddMMMyyyy",Locale.US);

because the length of month is 3 character

How to convert dd/mm/yyyy to mm/dd/yyyy in Excel cells?, (VALUE(RIGHT(A9,4)), VALUE(MID(A9,4,2)), VALUE(LEFT(A9,2))), and drag fill handle over the cells which need to use this formula. How to change date and time formats on Windows 10. Open Settings . Click on Time & language . Click on Date & time . Under format click the Change date and time formats link. Use the Short name drop-down menu to select the date format you want to see in the Taskbar. Use the Short time drop-down menu

If you are using Java8+, I would strongly suggest to use java.time library, if not, then you can use ThreeTen Backport library which is equivalent to java.time API :

String date = "24May2018";
LocalDate ldt = LocalDate.parse(date, DateTimeFormatter.ofPattern("ddMMMyyyy", Locale.US));
String result = ldt.format(DateTimeFormatter.ofPattern("dd-MM-yyyy",Locale.US));
=>24-05-2018

How to change Excel date format and create custom formatting, How do I change the default date format in Excel? Follow these steps: Select the cells you want to format. Press CTRL+1. In the Format Cells box, click the Number tab. In the Category list, click Date . Under Type , pick a date format. Your format will preview in the Sample box with the first date in your data. Note: Date formats that begin with

You can try to do something like this:

    String stringDate = "24May2018";

    SimpleDateFormat inputParser = new SimpleDateFormat("ddMMMyyyy", Locale.US);
    SimpleDateFormat outputParser = new SimpleDateFormat("dd-MM-yyyy", Locale.US);

    Date temp;
    String outputDate;

    try {
        temp = inputParser.parse(stringDate);
        outputDate = outputParser.format(temp);

    } catch (ParseException e) {
        e.printStackTrace();
    }

Format a date the way you want, How do I change the date format in Windows 10 to mm dd yyyy? Select the dates whose format your want to change, or empty cells where you want to insert dates. Press Ctrl+1 to open the Format Cells dialog. Alternatively, you can right click the selected cells and choose Format Cells… from the context menu. In the Format Cells window, switch to the Number tab,

Change the date system, format, or two-digit year interpretation, If you change your date setting in Control Panel, the default date format in Excel will change accordingly. If you don't like the default date format, you can choose  If you encounter an Excel date that won’t change when you change its format it’s likely that your dates aren’t being stored as ‘true’ dates (ie. date serial numbers) by Excel, but rather as text. You can confirm this by setting the cell’s format to Number and checking whether a serial number appears. You can

3 Ways of How to change date format in Excel? (14 date formulas), Dates are often a critical part of data analysis. Entering dates correctly is essential to ensuring accurate results. But formatting dates so that they are easy to  Navigate to the time and date settings. In order to change the standard date format for any new Excel sheet, you will need to change the overarching date format for you computer. First, click the Start button. The next step will depend on which operating system you are using: X Research source

Date format in Excel, Select and right click on date cells that you want to customize and go to “Format Cells”. Under the Number –> Category, select Date and choose the closest format  Change Date Format by Using FORMAT Function In VBA we have a function called FORMAT which can be used to apply the desired format to the cell. We just need to specify what the value is for “Expression” and apply the “Format” accordingly. Look at the below code for an example.

Comments
  • Post a minimal reproducible example....
  • Try with "ddMMMyyyy" .
  • Why do you expect the pattern ddMMyyyy to match a String in the form of 24May2018 ?
  • If you're using Java 8 or above, switch to using java.time packages, not the old Date and SimpleDateFormat. If older java, it's best to use the backward compatibility libraries for that if at all possible.
  • Write a junit test for parsing to determine if date is parsable and try several formulations of your date format, output should tell You which is the right match.
  • This requires Java 8+?
  • exactly @ThorbjørnRavnAndersen but if you are not using Java 8+ you can use ThreeTen Backport
  • Sure. You might want to make your answer more complete then.