Monday, April 26, 2010

reformat iso date

I was given a tiny challenge, write a function that changes "yyyy-mm-dd HH:MM" into "mm/dd/yyyy".

First I wrote a test:
package org.yi.happy;

import static org.junit.Assert.assertEquals;

import org.junit.Test;

public class DateReformatTest {
    public void test1() {
        String have = DateReformat.isoToAccess("2010-02-01 14:40");

        assertEquals("02/01/2010", have);


Then I wrote the code, and used a regular expression to do the work:
package org.yi.happy;

public class DateReformat {

    public static String isoToAccess(String value) {
        return value.replaceAll(
                "^(\\d\\d\\d\\d)-(\\d\\d)-(\\d\\d) \\d\\d:\\d\\d$",


All it does is capture some groups of digits, then re-arranges them. If it does not match it just returns the original string.

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