0.13.1 修复datetime clone无效的bug

build.gradle

@@ -21,7 +21,7 @@ allprojects {
 
 subprojects {
     ext {
-        version '0.13.0'
+        version '0.13.1'
         spring_version = "2.3.0.RELEASE"
     }
 

src/gaea/src/main/kotlin/com/synebula/gaea/data/date/DateTime.kt

@@ -506,7 +506,7 @@ class DateTime() : Comparable<DateTime> {
      * @return 返回新的DateTime对象
      */
     fun clone(): DateTime {
-        return DateTime(this.calendar)
+        return DateTime(this.calendar.clone() as Calendar)
     }
 
     /**