TimeUtilities.java

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/*
 * Sleuth Kit Data Model
 * 
 * Copyright 2017 Basis Technology Corp.
 * Contact: carrier <at> sleuthkit <dot> org
 * 
 * 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 org.sleuthkit.datamodel;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
import java.util.logging.Level;
import java.util.logging.Logger;

public class TimeUtilities {
        private static final Logger LOGGER = Logger.getLogger(TimeUtilities.class.getName());
        private static final SimpleDateFormat DATE_FORMATTER = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss z");
        
        private TimeUtilities(){                
        }
        
        public static String epochToTime(long epoch) {
                String time = "0000-00-00 00:00:00";
                if (epoch != 0) {
                        time = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss z").format(new java.util.Date(epoch * 1000));
                }
                return time;
        }

        public static String epochToTime(long epoch, TimeZone tzone) {
                String time = "0000-00-00 00:00:00";
                if (epoch != 0) {
                        synchronized (DATE_FORMATTER) {
                                DATE_FORMATTER.setTimeZone(tzone);
                                time = DATE_FORMATTER.format(new java.util.Date(epoch * 1000));
                        }
                }
                return time;
        }
        
        public static String epochToTimeISO8601(long epoch, TimeZone tzone) {
                SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
                formatter.setTimeZone(tzone);
                return formatter.format(new Date(epoch));
        }
        
        public static long timeToEpoch(String time) {
                long epoch = 0;
                try {
                        epoch = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(time).getTime() / 1000;
                } catch (Exception e) {
                        LOGGER.log(Level.WARNING, "Failed to parse time string", e); //NON-NLS
                }

                return epoch;
        }
}