diff --git a/meteoinfo-chart/src/main/java/org/meteoinfo/chart/axis/Axis.java b/meteoinfo-chart/src/main/java/org/meteoinfo/chart/axis/Axis.java
index d94473bd..ef70ac1c 100644
--- a/meteoinfo-chart/src/main/java/org/meteoinfo/chart/axis/Axis.java
+++ b/meteoinfo-chart/src/main/java/org/meteoinfo/chart/axis/Axis.java
@@ -1624,31 +1624,27 @@ public class Axis extends Artist implements Cloneable {
             }
             //Time label - left
             if (this.drawTickLabel) {
-                DateTimeFormatter format;
                 if (this instanceof TimeAxis) {
                     TimeAxis tAxis = (TimeAxis) this;
                     if (tAxis.isVarFormat()) {
-                        drawStr = null;
+                        int idx = this.inverse ? this.getTickValues().length - 1 : 0;
+                        LocalDateTime cDate = JDateUtil.fromOADate(this.getTickValues()[idx]);
+                        DateTimeFormatter format = null;
                         switch (tAxis.getTimeUnit()) {
                             case MONTH:
                                 format = DateTimeFormatter.ofPattern("yyyy");
-                                LocalDateTime cdate = JDateUtil.fromOADate(this.getTickValues()[0]);
-                                drawStr = format.format(cdate);
                                 break;
                             case DAY:
                                 format = DateTimeFormatter.ofPattern("yyyy-MM");
-                                cdate = JDateUtil.fromOADate(this.getTickValues()[0]);
-                                drawStr = format.format(cdate);
                                 break;
                             case HOUR:
                             case MINUTE:
                             case SECOND:
                                 format = DateTimeFormatter.ofPattern("yyyy-MM-dd");
-                                cdate = JDateUtil.fromOADate(this.getTickValues()[0]);
-                                drawStr = format.format(cdate);
                                 break;
                         }
-                        if (drawStr != null) {
+                        if (format != null) {
+                            drawStr = format.format(cDate);
                             labx = (float) minx;
                             laby = laby + this.tickSpace;
                             Draw.drawString(g, labx, laby, drawStr, XAlign.LEFT, YAlign.TOP, true);
diff --git a/meteoinfo-lab/milconfig.xml b/meteoinfo-lab/milconfig.xml
index 1bf2b597..a1700e12 100644
--- a/meteoinfo-lab/milconfig.xml
+++ b/meteoinfo-lab/milconfig.xml
@@ -1,14 +1,11 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <MeteoInfo File="milconfig.xml" Type="configurefile">
-  <Path OpenPath="D:\Working\MIScript\Jython\mis\plot_types\contour">
-    <RecentFolder Folder="D:\Working\MIScript\Jython\mis\chart\axis"/>
-    <RecentFolder Folder="D:\Working\MIScript\Jython\mis\map\topology"/>
+  <Path OpenPath="D:\Working\MIScript\Jython\mis\traj">
     <RecentFolder Folder="D:\Working\MIScript\Jython\mis\meteo\eof"/>
     <RecentFolder Folder="D:\Working\MIScript\Jython\mis\meteo\calc"/>
     <RecentFolder Folder="D:\Working\MIScript\Jython\mis\meteo"/>
     <RecentFolder Folder="D:\Working\MIScript\Jython\mis\common_math"/>
     <RecentFolder Folder="D:\Working\MIScript\Jython\mis\common_math\stats"/>
-    <RecentFolder Folder="D:\Working\MIScript\Jython\mis"/>
     <RecentFolder Folder="D:\Working\MIScript\Jython\mis\chart"/>
     <RecentFolder Folder="D:\Working\MIScript\Jython\mis\chart\subplot"/>
     <RecentFolder Folder="D:\Working\MIScript\Jython\mis\plot_types\scatter"/>
@@ -16,17 +13,20 @@
     <RecentFolder Folder="D:\Working\MIScript\Jython\mis\map\projection"/>
     <RecentFolder Folder="D:\Working\MIScript\Jython\mis\plot_types"/>
     <RecentFolder Folder="D:\Working\MIScript\Jython\mis\plot_types\contour"/>
+    <RecentFolder Folder="D:\Working\MIScript\Jython\mis\array"/>
+    <RecentFolder Folder="D:\Working\MIScript\Jython\mis"/>
+    <RecentFolder Folder="D:\Working\MIScript\Jython\mis\traj"/>
   </Path>
   <File>
     <OpenedFiles>
       <OpenedFile File="D:\Working\MIScript\Jython\mis\plot_types\plot\plot_cdata_3.py"/>
-      <OpenedFile File="D:\Working\MIScript\Jython\mis\plot_types\contour\conout_negtive_value.py"/>
-      <OpenedFile File="D:\Working\MIScript\Jython\mis\plot_types\contour\conoutm_clabel_1.py"/>
+      <OpenedFile File="D:\Working\MIScript\Jython\mis\array\astype_1.py"/>
+      <OpenedFile File="D:\Working\MIScript\Jython\mis\traj\plot_traj_bd.py"/>
     </OpenedFiles>
     <RecentFiles>
       <RecentFile File="D:\Working\MIScript\Jython\mis\plot_types\plot\plot_cdata_3.py"/>
-      <RecentFile File="D:\Working\MIScript\Jython\mis\plot_types\contour\conout_negtive_value.py"/>
-      <RecentFile File="D:\Working\MIScript\Jython\mis\plot_types\contour\conoutm_clabel_1.py"/>
+      <RecentFile File="D:\Working\MIScript\Jython\mis\array\astype_1.py"/>
+      <RecentFile File="D:\Working\MIScript\Jython\mis\traj\plot_traj_bd.py"/>
     </RecentFiles>
   </File>
   <Font>
diff --git a/meteoinfo-lab/pylib/mipylib/numeric/core/_dtype$py.class b/meteoinfo-lab/pylib/mipylib/numeric/core/_dtype$py.class
index 0987351d..25df6918 100644
Binary files a/meteoinfo-lab/pylib/mipylib/numeric/core/_dtype$py.class and b/meteoinfo-lab/pylib/mipylib/numeric/core/_dtype$py.class differ
diff --git a/meteoinfo-lab/pylib/mipylib/numeric/core/_dtype.py b/meteoinfo-lab/pylib/mipylib/numeric/core/_dtype.py
index b8a66647..1c8ed457 100644
--- a/meteoinfo-lab/pylib/mipylib/numeric/core/_dtype.py
+++ b/meteoinfo-lab/pylib/mipylib/numeric/core/_dtype.py
@@ -7,16 +7,25 @@ __all__ = [
 
 _dtype_dict = dict(byte = JDataType.BYTE,
     char = JDataType.CHAR,
+    bool = JDataType.BOOLEAN,
     boolean = JDataType.BOOLEAN,
     int = JDataType.INT,
+    int32 = JDataType.INT,
+    integer = JDataType.INT,
     uint = JDataType.UINT,
     short = JDataType.SHORT,
+    int16 = JDataType.SHORT,
     long = JDataType.LONG,
+    int64 = JDataType.LONG,
     float = JDataType.FLOAT,
+    float32 = JDataType.FLOAT,
     double = JDataType.DOUBLE,
+    float64 = JDataType.DOUBLE,
+    str = JDataType.STRING,
     string = JDataType.STRING,
     complex = JDataType.COMPLEX,
     date = JDataType.DATE,
+    datetime = JDataType.DATE,
     object = JDataType.OBJECT)
 
 class DataType(object):
diff --git a/meteoinfo-lab/pylib/mipylib/numeric/core/_ndarray.py b/meteoinfo-lab/pylib/mipylib/numeric/core/_ndarray.py
index 97d95ef5..d32e10c9 100644
--- a/meteoinfo-lab/pylib/mipylib/numeric/core/_ndarray.py
+++ b/meteoinfo-lab/pylib/mipylib/numeric/core/_ndarray.py
@@ -717,17 +717,18 @@ class NDArray(object):
         if self.dtype == dtype:
             return self.copy()
 
-        if dtype.kind == 'i':
-            r = NDArray(ArrayUtil.toInteger(self._array))
-        elif dtype.kind == 'f':
-            if dtype.name == 'float':
-                r = NDArray(ArrayUtil.toFloat(self._array))
-            else:
-                r = NDArray(ArrayUtil.toDouble(self._array))
-        elif dtype.kind == 'b':
-            r = NDArray(ArrayUtil.toBoolean(self._array))
-        else:
-            r = self
+        # if dtype.kind == 'i':
+        #     r = NDArray(ArrayUtil.toInteger(self._array))
+        # elif dtype.kind == 'f':
+        #     if dtype.name == 'float':
+        #         r = NDArray(ArrayUtil.toFloat(self._array))
+        #     else:
+        #         r = NDArray(ArrayUtil.toDouble(self._array))
+        # elif dtype.kind == 'b':
+        #     r = NDArray(ArrayUtil.toBoolean(self._array))
+        # else:
+        #     r = self
+        r = NDArray(ArrayUtil.convertToDataType(self._array, dtype._dtype))
         return r
 
     @property
diff --git a/meteoinfo-ndarray/src/main/java/org/meteoinfo/ndarray/ArrayDouble.java b/meteoinfo-ndarray/src/main/java/org/meteoinfo/ndarray/ArrayDouble.java
index a21c5a8d..7c8c1e17 100644
--- a/meteoinfo-ndarray/src/main/java/org/meteoinfo/ndarray/ArrayDouble.java
+++ b/meteoinfo-ndarray/src/main/java/org/meteoinfo/ndarray/ArrayDouble.java
@@ -32,6 +32,8 @@
  */
 package org.meteoinfo.ndarray;
 
+import org.meteoinfo.common.util.JDateUtil;
+
 import java.nio.ByteBuffer;
 import java.nio.DoubleBuffer;
 import java.time.LocalDateTime;
@@ -266,9 +268,13 @@ public class ArrayDouble extends Array {
         throw new ForbiddenConversionException();
     }
 
-    public LocalDateTime getDate(Index i) { throw new ForbiddenConversionException(); }
+    public LocalDateTime getDate(Index i) {
+        return JDateUtil.fromOADate(storageD[i.currentElement()]);
+    }
 
-    public void setDate(Index i, LocalDateTime value) { throw new ForbiddenConversionException(); }
+    public void setDate(Index i, LocalDateTime value) {
+        storageD[i.currentElement()] = JDateUtil.toOADate(value);
+    }
 
     public Object getObject(Index i) {
         return storageD[i.currentElement()];
@@ -363,9 +369,13 @@ public class ArrayDouble extends Array {
         throw new ForbiddenConversionException();
     }
 
-    public LocalDateTime getDate(int index) { throw new ForbiddenConversionException(); }
+    public LocalDateTime getDate(int index) {
+        return JDateUtil.fromOADate(storageD[index]);
+    }
 
-    public void setDate(int index, LocalDateTime value) { throw new ForbiddenConversionException(); }
+    public void setDate(int index, LocalDateTime value) {
+        storageD[index] = JDateUtil.toOADate(value);
+    }
 
     public Object getObject(int index) {
         return getDouble(index);
diff --git a/meteoinfo-ndarray/src/main/java/org/meteoinfo/ndarray/ArrayString.java b/meteoinfo-ndarray/src/main/java/org/meteoinfo/ndarray/ArrayString.java
index ba9722a9..e2ba3373 100644
--- a/meteoinfo-ndarray/src/main/java/org/meteoinfo/ndarray/ArrayString.java
+++ b/meteoinfo-ndarray/src/main/java/org/meteoinfo/ndarray/ArrayString.java
@@ -191,122 +191,122 @@ public class ArrayString extends Array {
     }
 
     /**
-     * set the value at the sepcified index.
+     * set the value at the specified index.
      */
     public void set(Index i, String value) {
         storage[i.currentElement()] = value;
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * get the double value at the specified index.
      */
     public double getDouble(Index i) {
-        throw new ForbiddenConversionException();
+        return Double.parseDouble(storage[i.currentElement()]);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * set the value at the specified index.
      */
     public void setDouble(Index i, double value) {
-        throw new ForbiddenConversionException();
+        storage[i.currentElement()] = String.valueOf(value);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * get the float value at the specified index.
      */
     public float getFloat(Index i) {
-        throw new ForbiddenConversionException();
+        return Float.parseFloat(storage[i.currentElement()]);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * set the value at the specified index.
      */
     public void setFloat(Index i, float value) {
-        throw new ForbiddenConversionException();
+        storage[i.currentElement()] = String.valueOf(value);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * get the long value at the specified index.
      */
     public long getLong(Index i) {
-        throw new ForbiddenConversionException();
+        return Long.parseLong(storage[i.currentElement()]);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * set the value at the specified index.
      */
     public void setLong(Index i, long value) {
-        throw new ForbiddenConversionException();
+        storage[i.currentElement()] = String.valueOf(value);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * get the integer value at the specified index.
      */
     public int getInt(Index i) {
-        throw new ForbiddenConversionException();
+        return Integer.parseInt(storage[i.currentElement()]);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * set the value at the specified index.
      */
     public void setInt(Index i, int value) {
-        throw new ForbiddenConversionException();
+        storage[i.currentElement()] = String.valueOf(value);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * get the short value at the specified index.
      */
     public short getShort(Index i) {
-        throw new ForbiddenConversionException();
+        return Short.parseShort(storage[i.currentElement()]);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * set the value at the specified index.
      */
     public void setShort(Index i, short value) {
-        throw new ForbiddenConversionException();
+        storage[i.currentElement()] = String.valueOf(value);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * get the byte value at the specified index.
      */
     public byte getByte(Index i) {
-        throw new ForbiddenConversionException();
+        return Byte.parseByte(storage[i.currentElement()]);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * set the value at the specified index.
      */
     public void setByte(Index i, byte value) {
-        throw new ForbiddenConversionException();
+        storage[i.currentElement()] = String.valueOf(value);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * get the boolean value at the specified index.
      */
     public boolean getBoolean(Index i) {
-        throw new ForbiddenConversionException();
+        return Boolean.parseBoolean(storage[i.currentElement()]);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * set the value at the specified index.
      */
     public void setBoolean(Index i, boolean value) {
-        throw new ForbiddenConversionException();
+        storage[i.currentElement()] = String.valueOf(value);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * get the char value at the specified index.
      */
     public char getChar(Index i) {
-        throw new ForbiddenConversionException();
+        return storage[i.currentElement()].charAt(0);
     }
 
     /**
-     * not legal, throw ForbiddenConversionException
+     * set the value at the specified index.
      */
     public void setChar(Index i, char value) {
-        throw new ForbiddenConversionException();
+        storage[i.currentElement()] = String.valueOf(value);
     }
     
     public String getString(Index i) {
@@ -339,67 +339,67 @@ public class ArrayString extends Array {
 
     // package private : mostly for iterators
     public double getDouble(int index) {
-        throw new ForbiddenConversionException();
+        return Double.parseDouble(storage[index]);
     }
 
     public void setDouble(int index, double value) {
-        throw new ForbiddenConversionException();
+        storage[index] = String.valueOf(value);
     }
 
     public float getFloat(int index) {
-        throw new ForbiddenConversionException();
+        return Float.parseFloat(storage[index]);
     }
 
     public void setFloat(int index, float value) {
-        throw new ForbiddenConversionException();
+        storage[index] = String.valueOf(value);
     }
 
     public long getLong(int index) {
-        throw new ForbiddenConversionException();
+        return Long.parseLong(storage[index]);
     }
 
     public void setLong(int index, long value) {
-        throw new ForbiddenConversionException();
+        storage[index] = String.valueOf(value);
     }
 
     public int getInt(int index) {
-        throw new ForbiddenConversionException();
+        return Integer.parseInt(storage[index]);
     }
 
     public void setInt(int index, int value) {
-        throw new ForbiddenConversionException();
+        storage[index] = String.valueOf(value);
     }
 
     public short getShort(int index) {
-        throw new ForbiddenConversionException();
+        return Short.parseShort(storage[index]);
     }
 
     public void setShort(int index, short value) {
-        throw new ForbiddenConversionException();
+        storage[index] = String.valueOf(value);;
     }
 
     public byte getByte(int index) {
-        throw new ForbiddenConversionException();
+        return Byte.parseByte(storage[index]);
     }
 
     public void setByte(int index, byte value) {
-        throw new ForbiddenConversionException();
+        storage[index] = String.valueOf(value);
     }
 
     public char getChar(int index) {
-        throw new ForbiddenConversionException();
+        return storage[index].charAt(0);
     }
 
     public void setChar(int index, char value) {
-        throw new ForbiddenConversionException();
+        storage[index] = String.valueOf(value);
     }
 
     public boolean getBoolean(int index) {
-        throw new ForbiddenConversionException();
+        return Boolean.parseBoolean(storage[index]);
     }
 
     public void setBoolean(int index, boolean value) {
-        throw new ForbiddenConversionException();
+        storage[index] = String.valueOf(value);
     }
     
     public String getString(int index) {
@@ -411,11 +411,11 @@ public class ArrayString extends Array {
     }
     
     public Complex getComplex(int index) {
-        throw new ForbiddenConversionException();
+        return Complex.parse(storage[index]);
     }
     
     public void setComplex(int index, Complex value) {
-        throw new ForbiddenConversionException();
+        storage[index] = value.toString();
     }
 
     public LocalDateTime getDate(int index) { throw new ForbiddenConversionException(); }
diff --git a/meteoinfo-ndarray/src/main/java/org/meteoinfo/ndarray/math/ArrayUtil.java b/meteoinfo-ndarray/src/main/java/org/meteoinfo/ndarray/math/ArrayUtil.java
index b9ae9cab..aa756411 100644
--- a/meteoinfo-ndarray/src/main/java/org/meteoinfo/ndarray/math/ArrayUtil.java
+++ b/meteoinfo-ndarray/src/main/java/org/meteoinfo/ndarray/math/ArrayUtil.java
@@ -1900,6 +1900,76 @@ public class ArrayUtil {
         }
     }
 
+    /**
+     * Convert array to another data type
+     * @param a The input array
+     * @param dataType The data type to be converted
+     * @return Converted array
+     */
+    public static Array convertToDataType(Array a, DataType dataType) {
+        if (a.getDataType() == dataType) {
+            return a;
+        } else {
+            Array r = Array.factory(dataType, a.getShape());
+            IndexIterator iterA = a.getIndexIterator();
+            IndexIterator iterR = r.getIndexIterator();
+            switch (dataType) {
+                case BYTE:
+                    while (iterR.hasNext()) {
+                        iterR.setByteNext(iterA.getByteNext());
+                    }
+                    break;
+                case BOOLEAN:
+                    while (iterR.hasNext()) {
+                        iterR.setBooleanNext(iterA.getBooleanNext());
+                    }
+                    break;
+                case SHORT:
+                    while (iterR.hasNext()) {
+                        iterR.setShortNext(iterA.getShortNext());
+                    }
+                    break;
+                case INT:
+                    while (iterR.hasNext()) {
+                        iterR.setIntNext(iterA.getIntNext());
+                    }
+                    break;
+                case LONG:
+                    while (iterR.hasNext()) {
+                        iterR.setLongNext(iterA.getLongNext());
+                    }
+                    break;
+                case FLOAT:
+                    while (iterR.hasNext()) {
+                        iterR.setFloatNext(iterA.getFloatNext());
+                    }
+                    break;
+                case DOUBLE:
+                    while (iterR.hasNext()) {
+                        iterR.setDoubleNext(iterA.getDoubleNext());
+                    }
+                    break;
+                case COMPLEX:
+                    while (iterR.hasNext()) {
+                        iterR.setComplexNext(iterA.getComplexNext());
+                    }
+                    break;
+                case STRING:
+                    while (iterR.hasNext()) {
+                        iterR.setStringNext(iterA.getStringNext());
+                    }
+                    break;
+                case DATE:
+                    while (iterR.hasNext()) {
+                        iterR.setDateNext(iterA.getDateNext());
+                    }
+                    break;
+            }
+
+            return r;
+        }
+    }
+
     /**
      * Convert array to integer type
      *