Get week by datetime, datetime format must be contracted with DATE_FORMAT. - Android java.util

Android examples for java.util:Date Format

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Description

Get week by datetime, datetime format must be contracted with DATE_FORMAT.

Demo Code

/*//from  www  .  ja  v  a 2  s. c o  m
 * Copyright (C) 2016 venshine.cn@gmail.com
 *
 * 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.
 */
//package com.java2s;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

public class Main {
    public static final String DATE_FORMAT = "yyyyMMdd";
    public static final String[] WEEKS = { "SUN", "MON", "TUES", "WED",
            "THUR", "FRI", "SAT" };

    /**
     * Get week by datetime, datetime format must be contracted with DATE_FORMAT.
     *
     * @param datetime
     * @return
     */
    public static String getWeek(String datetime) {
        Calendar cal = Calendar.getInstance();
        DateFormat f = new SimpleDateFormat(DATE_FORMAT);
        try {
            cal.setTime(f.parse(datetime));
            int week_index = cal.get(Calendar.DAY_OF_WEEK) - 1;
            if (week_index < 0) {
                week_index = 0;
            }
            return WEEKS[week_index];
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return "";
    }
}

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