Autopsy  4.19.3
Graphical digital forensics platform for The Sleuth Kit and other tools.
TimeZoneUtils.java
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1 /*
2  * Autopsy Forensic Browser
3  *
4  * Copyright 2011-2021 Basis Technology Corp.
5  * Contact: carrier <at> sleuthkit <dot> org
6  *
7  * Licensed under the Apache License, Version 2.0 (the "License");
8  * you may not use this file except in compliance with the License.
9  * You may obtain a copy of the License at
10  *
11  * http://www.apache.org/licenses/LICENSE-2.0
12  *
13  * Unless required by applicable law or agreed to in writing, software
14  * distributed under the License is distributed on an "AS IS" BASIS,
15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16  * See the License for the specific language governing permissions and
17  * limitations under the License.
18  */
19 package org.sleuthkit.autopsy.coreutils;
20 
21 import java.text.DateFormat;
22 import java.text.SimpleDateFormat;
23 import java.util.ArrayList;
24 import java.util.Collections;
25 import java.util.Comparator;
26 import java.util.GregorianCalendar;
27 import java.util.List;
28 import java.util.SimpleTimeZone;
29 import java.util.TimeZone;
31 import org.sleuthkit.datamodel.TimeUtilities;
32 
36 public class TimeZoneUtils {
37 
47  public static String convertToAlphaNumericFormat(String timeZoneId) {
48 
49  java.util.TimeZone zone = java.util.TimeZone.getTimeZone(timeZoneId);
50  int offset = zone.getRawOffset() / 1000;
51  int hour = offset / 3600;
52  int min = Math.abs((offset % 3600) / 60);
53 
54  DateFormat dfm = new SimpleDateFormat("z");
55  dfm.setTimeZone(zone);
56  boolean hasDaylight = zone.useDaylightTime();
57  String first = dfm.format(new GregorianCalendar(2010, 1, 1).getTime()).substring(0, 3);
58  String second = dfm.format(new GregorianCalendar(2011, 6, 6).getTime()).substring(0, 3);
59  int mid = hour * -1;
60  String result = first + Integer.toString(mid);
61  if (min != 0) {
62  result = result + ":" + Integer.toString(min);
63  }
64  if (hasDaylight) {
65  result += second;
66  }
67 
68  return result;
69  }
70 
78  public static String createTimeZoneString(TimeZone timeZone) {
79  int offset = timeZone.getRawOffset() / 1000;
80  int hour = offset / 3600;
81  int minutes = Math.abs((offset % 3600) / 60);
82 
83  return String.format("(GMT%+d:%02d) %s", hour, minutes, timeZone.getID()); //NON-NLS
84  }
85 
89  public static List<String> createTimeZoneList() {
90  /*
91  * Create a list of time zones.
92  */
93  List<TimeZone> timeZoneList = new ArrayList<>();
94 
95  String[] ids = SimpleTimeZone.getAvailableIDs();
96  for (String id : ids) {
97  /*
98  * DateFormat dfm = new SimpleDateFormat("z");
99  * dfm.setTimeZone(zone); boolean hasDaylight =
100  * zone.useDaylightTime(); String first = dfm.format(new Date(2010,
101  * 1, 1)); String second = dfm.format(new Date(2011, 6, 6)); int mid
102  * = hour * -1; String result = first + Integer.toString(mid);
103  * if(hasDaylight){ result = result + second; }
104  * timeZoneComboBox.addItem(item + " (" + result + ")");
105  */
106  timeZoneList.add(TimeZone.getTimeZone(id));
107  }
108 
109  /*
110  * Sort the list of time zones first by offset, then by ID.
111  */
112  Collections.sort(timeZoneList, new Comparator<TimeZone>() {
113  @Override
114  public int compare(TimeZone o1, TimeZone o2) {
115  int offsetDelta = Integer.compare(o1.getRawOffset(), o2.getRawOffset());
116 
117  if (offsetDelta == 0) {
118  return o1.getID().compareToIgnoreCase(o2.getID());
119  }
120 
121  return offsetDelta;
122  }
123  });
124 
125  /*
126  * Create a list of Strings encompassing both the GMT offset and the
127  * time zone ID.
128  */
129  List<String> outputList = new ArrayList<>();
130 
131  for (TimeZone timeZone : timeZoneList) {
132  outputList.add(createTimeZoneString(timeZone));
133  }
134 
135  return outputList;
136  }
137 
145  public static String getFormattedTime(long epochTime) {
146  return TimeUtilities.epochToTime(epochTime, getTimeZone());
147  }
148 
157  public static String getFormattedTimeISO8601(long epochTime) {
158  return TimeUtilities.epochToTimeISO8601(epochTime, getTimeZone());
159  }
160 
166  public static TimeZone getTimeZone() {
168  return TimeZone.getDefault();
169  }
170 
171  return TimeZone.getTimeZone(UserPreferences.getTimeZoneForDisplays());
172  }
173 
177  private TimeZoneUtils() {
178 
179  }
180 }
static String getFormattedTime(long epochTime)
static String createTimeZoneString(TimeZone timeZone)
static String getFormattedTimeISO8601(long epochTime)
static String convertToAlphaNumericFormat(String timeZoneId)

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