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-rw-r--r--src/org/traccar/helper/DateUtil.java55
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diff --git a/src/org/traccar/helper/DateUtil.java b/src/org/traccar/helper/DateUtil.java
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+++ b/src/org/traccar/helper/DateUtil.java
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+/*
+ * Copyright 2016 Anton Tananaev (anton.tananaev@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 org.traccar.helper;
+
+import java.util.Calendar;
+import java.util.Date;
+
+public class DateUtil {
+
+ public static Date correctDay(Date guess) {
+ return correctDate(new Date(), guess, Calendar.DAY_OF_MONTH);
+ }
+
+ public static Date correctYear(Date guess) {
+ return correctDate(new Date(), guess, Calendar.YEAR);
+ }
+
+ public static Date correctDate(Date now, Date guess, int field) {
+
+ if (guess.getTime() > now.getTime()) {
+ Date previous = dateAdd(guess, field, -1);
+ if (now.getTime() - previous.getTime() < guess.getTime() - now.getTime()) {
+ return previous;
+ }
+ } else if (guess.getTime() < now.getTime()) {
+ Date next = dateAdd(guess, field, 1);
+ if (next.getTime() - now.getTime() < now.getTime() - guess.getTime()) {
+ return next;
+ }
+ }
+
+ return guess;
+ }
+
+ private static Date dateAdd(Date guess, int field, int amount) {
+ Calendar calendar = Calendar.getInstance();
+ calendar.setTime(guess);
+ calendar.add(field, amount);
+ return calendar.getTime();
+ }
+
+}