Java Date Value Check isValidDateFormat(String startDate)

Description

Returns true if the provided GTFS-rt start_date is in YYYYMMDD format, false if it is not

License

Open Source License

Parameter

Parameter	Description
startDate	GTFS-rt start_date to check for formatting

Return

true if the provided GTFS-rt start_date is in YYYYMMDD format, false if it is not

Declaration

public static boolean isValidDateFormat(String startDate) 

Method Source Code

//package com.java2s;
/*/*from   w w  w  . j ava2s  .  c  o  m*/
 * Copyright (C) 2017 University of South Florida.
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

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

public class Main {
    private static DateFormat mDateFormat = new SimpleDateFormat("yyyyMMdd");

    /**
     * Returns true if the provided GTFS-rt start_date is in YYYYMMDD format, false if it is not
     *
     * @param startDate GTFS-rt start_date to check for formatting
     * @return true if the provided GTFS-rt start_date is in YYYYMMDD format, false if it is not
     */
    public static boolean isValidDateFormat(String startDate) {
        mDateFormat.setLenient(false);

        if (startDate.length() != 8) {
            // SimpleDateFormat doesn't catch 2017011 as bad format, so check length first
            return false;
        }

        try {
            mDateFormat.parse(startDate);
        } catch (ParseException e) {
            // Date format or value is invalid
            return false;
        }
        return true;
    }
}

Related

1. isValidDate(String inDate)
2. isValidDate(String psDt)
3. isValidDate(String s)
4. isValidDate(String src, String format)
5. isValidDate(String value)
6. isValidDateFormat(String strDate, String dataFormat)
7. isValidDateInternal(String date, String dateFormat)
8. isValidDatePattern(String pattern)
9. isValidDatePatterns(String dateStr, String patterns)