SimpleDateFormat giving a wrong formatted output

Question

I have one function which takes input a string value like 3-2020. I want to parse this string as a date and change its format to something like March-2020 using SimpleDateFormat class. Here is the code I am using for this task:

public String getCurrentMonth(String day) throws ParseException {
    Date today = new SimpleDateFormat("MM-YYYY").parse(day);
    return new SimpleDateFormat("MMMM-YYYY").format(today);
}

but it is giving a very different output string. When the input provided as 4-2020, it returns value as December-2020. The today variable has a value Sun Dec 29 00:00:00 GMT+05:30 2019. There is a huge difference in the dates. Why is it happening? and how to solve this?

I recommend you don’t use `SimpleDateFormat` and `Date`. Those classes are poorly designed and long outdated, the former in particular notoriously troublesome. Instead use `YearMonth` and `DateTimeFormatter`, both from [java.time, the modern Java date and time API](https://docs.oracle.com/javase/tutorial/datetime/). — Ole V.V., Jul 04 '20 at 11:45

score 1 · Answer 1 · answered Jul 04 '20 at 11:05

1

Please use this small y instead of Y

Date today = new SimpleDateFormat("MM-yyyy").parse("04-2020");
System.out.println(new SimpleDateFormat("MMMM-yyyy").format(today));

answered Jul 04 '20 at 11:05

Harmandeep Singh Kalsi

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score 1 · Accepted Answer · answered Jul 04 '20 at 11:05

1

Y is the format for the week year. It looks like you intended to use y, which is the format for the year:

public String getCurrentMonth(String day) throws ParseException {
    Date today = new SimpleDateFormat("MM-yyyy").parse(day);
    return new SimpleDateFormat("MMMM-yyyy").format(today);
}

answered Jul 04 '20 at 11:05

Mureinik

297,002
52
306
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exactly, it solved and cleared the meaning of notation with difference of `Y` and `y` – hawk Jul 04 '20 at 11:08

SimpleDateFormat giving a wrong formatted output

2 Answers2