Java Year From yearsBetween(String from, String to)

Description

years Between

License

Open Source License

Declaration

public static int yearsBetween(String from, String to) throws Exception 

Method Source Code

//package com.java2s;

public class Main {

    public static int yearsBetween(String from, String to) throws Exception {
        return yearsBetween(from, to, "yyyyMMdd");
    }// w ww.  j a v a2 s .  co  m

    public static int yearsBetween(String from, String to, String format) throws Exception {
        return (int) (daysBetween(from, to, format) / 365);
    }

    public static int daysBetween(String from, String to) throws Exception {
        return daysBetween(from, to, "yyyyMMdd");
    }

    public static int daysBetween(String from, String to, String format) throws Exception {
        // java.text.SimpleDateFormat formatter =
        // new java.text.SimpleDateFormat (format, java.util.Locale.CHINA);
        try {

            java.util.Date d1 = check(from, format);
            java.util.Date d2 = check(to, format);

            long duration = d2.getTime() - d1.getTime();

            return (int) (duration / (1000 * 60 * 60 * 24));
            // seconds in 1 day
        } catch (Exception e) {
            throw new Exception("[DateUtil][daysBetween]" + e.getMessage(), e);
        }
    }

    /**
     * check date string validation with an user defined format.
     *
     * @param s
     *            date string you want to check.
     * @param format
     *            string representation of the date format. For example,
     *            "yyyy-MM-dd".
     * @return date java.util.Date
     */
    private static java.util.Date check(String s, String format) throws java.text.ParseException {
        if (s == null)
            throw new java.text.ParseException("date string to check is null", 0);
        if (format == null)
            throw new java.text.ParseException("format string to check date is null", 0);

        java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat(format, java.util.Locale.CHINA);
        java.util.Date date = null;
        try {
            date = formatter.parse(s);
        } catch (java.text.ParseException e) {
            /*
             * throw new java.text.ParseException( e.getMessage() + " with
             * format \"" + format + "\"", e.getErrorOffset() );
             */
            throw new java.text.ParseException(" wrong date:\"" + s + "\" with format \"" + format + "\"", 0);
        }

        if (!formatter.format(date).equals(s))
            throw new java.text.ParseException("Out of bound date:\"" + s + "\" with format \"" + format + "\"", 0);
        return date;
    }
}

Related

1. yearformMatDate(Date date)
2. yearFromDate(String date)
3. yearFromDateValue(long x)
4. yearFromFileName(String str)
5. yearOfDate(Date s)