add DateTimeHelper for easily convert joda time objects in result set…

… to date string format or unix timestamp

src/main/kotlin/com.zeko.model/DateTimeHelper.kt

@@ -0,0 +1,69 @@
+/**
+ *  Copyright (c) 2018 Leng Sheng Hong
+ *  ------------------------------------------------------
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.zeko.model
+
+import org.joda.time.DateTimeZone
+import org.joda.time.LocalDateTime
+import org.joda.time.LocalDate
+import org.joda.time.LocalTime
+import org.joda.time.DateTime
+import org.joda.time.base.BaseLocal
+import org.joda.time.format.ISODateTimeFormat
+
+class DateTimeHelper {
+    companion object {
+        fun toDateTimeStrUTC(value: BaseLocal): Any {
+            val dt = when (value) {
+                is LocalDateTime -> value.toString(ISODateTimeFormat.dateTime()) + "Z"
+                is LocalDate -> value.toString(ISODateTimeFormat.date())
+                is LocalTime -> value.toString(ISODateTimeFormat.time())
+                else -> value
+            }
+            return dt
+        }
+
+        fun toDateTimeStrZone(value: BaseLocal, tzFrom: DateTimeZone?, tzTo: DateTimeZone?): Any {
+            val dt = when (value) {
+                is LocalDateTime -> DateTime(value.toDateTime(tzFrom).millis).toDateTime(tzTo).toString("yyyy-MM-dd'T'HH:mm:ss.SSSZZ")
+                is LocalDate -> value.toString(ISODateTimeFormat.date())
+                is LocalTime -> value.toString(ISODateTimeFormat.time())
+                else -> value
+            }
+            return dt
+        }
+
+        fun toUnixTimeMilis(value: BaseLocal): Any {
+            val dt = when (value) {
+                is LocalDateTime -> value.toDateTime(DateTimeZone.UTC).millis
+                else -> value
+            }
+            return dt
+        }
+
+        fun toUnixTime(value: BaseLocal): Any {
+            val milis = toUnixTimeMilis(value)
+            if (milis is Long) {
+                return milis / 1000
+            }
+            return milis
+        }
+    }
+}