Description
Parse the given date string to date object and return a date instance based on the given date string.
License
Open Source License
Parameter
| Parameter | Description |
|---|
| dateString | The date string to be parsed to date object. |
Exception
| Parameter | Description |
|---|
| ParseException | If the date format pattern of the given date string is unknown, or ifthe given date string or its actual date is invalid based on the date format pattern. |
Return
The parsed date object.
Declaration
private static Date parse(String dateString) throws ParseException
Method Source Code
//package com.java2s;
//License from project: Open Source License
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
public class Main {
private static final Map<String, String> DATE_FORMAT_REGEXPS = new HashMap<String, String>() {
/**/*from w w w . j a v a 2s.c om*/
*
*/
private static final long serialVersionUID = 6531756172647031848L;
{
put("^\\d{8}$", "yyyyMMdd");
put("^\\d{1,2}-\\d{1,2}-\\d{4}$", "dd-MM-yyyy");
put("^\\d{4}-\\d{1,2}-\\d{1,2}$", "yyyy-MM-dd");
put("^\\d{1,2}/\\d{1,2}/\\d{4}$", "MM/dd/yyyy");
put("^\\d{4}/\\d{1,2}/\\d{1,2}$", "yyyy/MM/dd");
put("^\\d{1,2}\\s[a-z]{3}\\s\\d{4}$", "dd MMM yyyy");
put("^\\d{1,2}\\s[a-z]{4,}\\s\\d{4}$", "dd MMMM yyyy");
put("^\\d{12}$", "yyyyMMddHHmm");
put("^\\d{8}\\s\\d{4}$", "yyyyMMdd HHmm");
put("^\\d{1,2}-\\d{1,2}-\\d{4}\\s\\d{1,2}:\\d{2}$", "dd-MM-yyyy HH:mm");
put("^\\d{4}-\\d{1,2}-\\d{1,2}\\s\\d{1,2}:\\d{2}$", "yyyy-MM-dd HH:mm");
put("^\\d{1,2}/\\d{1,2}/\\d{4}\\s\\d{1,2}:\\d{2}$", "MM/dd/yyyy HH:mm");
put("^\\d{4}/\\d{1,2}/\\d{1,2}\\s\\d{1,2}:\\d{2}$", "yyyy/MM/dd HH:mm");
put("^\\d{1,2}\\s[a-z]{3}\\s\\d{4}\\s\\d{1,2}:\\d{2}$", "dd MMM yyyy HH:mm");
put("^\\d{1,2}\\s[a-z]{4,}\\s\\d{4}\\s\\d{1,2}:\\d{2}$", "dd MMMM yyyy HH:mm");
put("^\\d{14}$", "yyyyMMddHHmmss");
put("^\\d{8}\\s\\d{6}$", "yyyyMMdd HHmmss");
put("^\\d{1,2}-\\d{1,2}-\\d{4}\\s\\d{1,2}:\\d{2}:\\d{2}$", "dd-MM-yyyy HH:mm:ss");
put("^\\d{4}-\\d{1,2}-\\d{1,2}\\s\\d{1,2}:\\d{2}:\\d{2}$", "yyyy-MM-dd HH:mm:ss");
put("^\\d{1,2}/\\d{1,2}/\\d{4}\\s\\d{1,2}:\\d{2}:\\d{2}$", "MM/dd/yyyy HH:mm:ss");
put("^\\d{4}/\\d{1,2}/\\d{1,2}\\s\\d{1,2}:\\d{2}:\\d{2}$", "yyyy/MM/dd HH:mm:ss");
put("^\\d{1,2}\\s[a-z]{3}\\s\\d{4}\\s\\d{1,2}:\\d{2}:\\d{2}$", "dd MMM yyyy HH:mm:ss");
put("^\\d{1,2}\\s[a-z]{4,}\\s\\d{4}\\s\\d{1,2}:\\d{2}:\\d{2}$", "dd MMMM yyyy HH:mm:ss");
}
};
/**
* Parse the given date string to date object and return a date instance based on the given
* date string. This makes use of the {@link DateUtil#determineDateFormat(String)} to determine
* the SimpleDateFormat pattern to be used for parsing.
*
* @param dateString The date string to be parsed to date object.
* @return The parsed date object.
* @throws ParseException If the date format pattern of the given date string is unknown, or if
* the given date string or its actual date is invalid based on the date format pattern.
*/
private static Date parse(String dateString) throws ParseException {
String dateFormat = determineDateFormat(dateString);
if (dateFormat == null) {
throw new ParseException("Unknown date format.", 0);
}
return parse(dateString, dateFormat);
}
/**
* Validate the actual date of the given date string based on the given date format pattern and
* return a date instance based on the given date string.
*
* @param dateString The date string.
* @param dateFormat The date format pattern which should respect the SimpleDateFormat rules.
* @return The parsed date object.
* @throws ParseException If the given date string or its actual date is invalid based on the
* given date format pattern.
* @see SimpleDateFormat
*/
private static Date parse(String dateString, String dateFormat) throws ParseException {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(dateFormat);
simpleDateFormat.setLenient(false); // Don't automatically convert invalid date.
return simpleDateFormat.parse(dateString);
}
/**
* Determine SimpleDateFormat pattern matching with the given date string. Returns null if
* format is unknown. You can simply extend DateUtil with more formats if needed.
*
* @param dateString The date string to determine the SimpleDateFormat pattern for.
* @return The matching SimpleDateFormat pattern, or null if format is unknown.
* @see SimpleDateFormat
*/
private static String determineDateFormat(String dateString) {
for (String regexp : DATE_FORMAT_REGEXPS.keySet()) {
if (dateString.toLowerCase().matches(regexp)) {
return DATE_FORMAT_REGEXPS.get(regexp);
}
}
return null; // Unknown format.
}
}
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