Java Parse Date Pattern YYYY parse(String dateString)

Description

parse

License

Open Source License

Declaration

public static Date parse(String dateString) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.text.ParseException;
import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.regex.Pattern;

public class Main {
    public static Date parse(String dateString) {
        try {//from w w  w  . jav a  2 s .  c  om
            if (dateString == null || "".equals(dateString)) {
                return null;
            }
            SimpleDateFormat format = new SimpleDateFormat();
            format.setLenient(false);
            if (Pattern.matches("\\d{4}\\-\\d{1,2}\\-\\d{1,2} \\d{1,2}:\\d{1,2}:\\d{1,2}.\\d{1,3}", dateString)) {
                format.applyPattern("yyyy-MM-dd HH:mm:ss.SSS");
            } else if (Pattern.matches("\\d{4}\\-\\d{1,2}\\-\\d{1,2} \\d{1,2}:\\d{1,2}:\\d{1,2}", dateString)) {
                format.applyPattern("yyyy-MM-dd HH:mm:ss");
            } else if (Pattern.matches("\\d{4}\\-\\d{1,2}\\-\\d{1,2} \\d{1,2}:\\d{1,2}", dateString)) {
                format.applyPattern("yyyy-MM-dd HH:mm");
            } else if (Pattern.matches("\\d{4}\\-\\d{1,2}\\-\\d{1,2} \\d{1,2}", dateString)) {
                format.applyPattern("yyyy-MM-dd HH");
            } else if (Pattern.matches("\\d{4}\\-\\d{1,2}\\-\\d{1,2}", dateString)) {
                format.applyPattern("yyyy-MM-dd");
            } else if (Pattern.matches("\\d{4}\\-\\d{1,2}", dateString)) {
                format.applyPattern("yyyy-MM");
            } else if (Pattern.matches("\\d{4}\\/\\d{1,2}\\/\\d{1,2} \\d{1,2}:\\d{1,2}:\\d{1,2}.\\d{1,3}",
                    dateString)) {
                format.applyPattern("yyyy/MM/dd HH:mm:ss.SSS");
            } else if (Pattern.matches("\\d{4}\\/\\d{1,2}\\/\\d{1,2} \\d{1,2}:\\d{1,2}:\\d{1,2}", dateString)) {
                format.applyPattern("yyyy/MM/dd HH:mm:ss");
            } else if (Pattern.matches("\\d{4}\\/\\d{1,2}\\/\\d{1,2} \\d{1,2}:\\d{1,2}", dateString)) {
                format.applyPattern("yyyy/MM/dd HH:mm");
            } else if (Pattern.matches("\\d{4}\\/\\d{1,2}\\/\\d{1,2} \\d{1,2}", dateString)) {
                format.applyPattern("yyyy/MM/dd HH");
            } else if (Pattern.matches("\\d{4}\\/\\d{1,2}\\/\\d{1,2}", dateString)) {
                format.applyPattern("yyyy/MM/dd");
            } else if (Pattern.matches("\\d{4}\\/\\d{1,2}", dateString)) {
                format.applyPattern("yyyy/MM");
            } else if (Pattern.matches("\\d{4}\\d{1,2}\\d{1,2} \\d{1,2}:\\d{1,2}:\\d{1,2}", dateString)) {
                format.applyPattern("yyyyMMdd HH:mm:ss");
            } else if (Pattern.matches("\\d{4}\\d{1,2}\\d{1,2} \\d{1,2}:\\d{1,2}", dateString)) {
                format.applyPattern("yyyyMMdd HH:mm");
            } else if (Pattern.matches("\\d{4}\\d{1,2}\\d{1,2} \\d{1,2}", dateString)) {
                format.applyPattern("yyyyMMdd HH");
            } else if (Pattern.matches("\\d{4}\\d{1,2}\\d{1,2}", dateString)) {
                format.applyPattern("yyyyMMdd");
            } else if (Pattern.matches("\\d{4}\\d{1,2}", dateString)) {
                format.applyPattern("yyyyMM");
            }
            return format.parse(dateString);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }
}

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