1 files changed, 78 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/helper/DateUtil.java b/src/main/java/org/traccar/helper/DateUtil.java
new file mode 100644
index 000000000..20a483e3c
--- /dev/null
+++ b/src/main/java/org/traccar/helper/DateUtil.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2016 Anton Tananaev (anton@traccar.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.traccar.helper;
+
+import java.text.SimpleDateFormat;
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.Calendar;
+import java.util.Date;
+
+public final class DateUtil {
+
+    private 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();
+    }
+
+    public static Date parseDate(String value) {
+        return Date.from(Instant.from(DateTimeFormatter.ISO_ZONED_DATE_TIME.parse(value)));
+    }
+
+    public static String formatDate(Date date) {
+        return formatDate(date, true);
+    }
+
+    public static String formatDate(Date date, boolean zoned) {
+        if (zoned) {
+            return DateTimeFormatter.ISO_OFFSET_DATE_TIME.withZone(ZoneId.systemDefault()).format(date.toInstant());
+        } else {
+            return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date);
+        }
+    }
+
+}