Cast Date and Time field value to the correct type when checking for modification

issue10655
review352481002
(grafted from b03d7d7e0225a0a582eae5ddf0f79324760f58c6)

--HG--
branch : 6.0

src/sao.js

@@ -262,15 +262,20 @@ var Sao = {};
         }
         datetime.isDateTime = true;
         datetime.local();
+        datetime.todate = function() {
+            return Sao.Date(this.year(), this.month(), this.date());
+        };
+        datetime.totime = function() {
+            return Sao.Time(
+                this.hour(), this.minute(), this.second(), this.millisecond());
+        };
         return datetime;
     };
 
     Sao.DateTime.combine = function(date, time) {
-        var datetime = date.clone();
-        datetime.set({hour: time.hour(), minute: time.minute(),
-            second: time.second(), millisecond: time.millisecond()});
-        datetime.isDateTime = true;
-        return datetime;
+        return Sao.DateTime(
+            date.year(), date.month(), date.date(),
+            time.hour(), time.minute(), time.second(), time.millisecond());
     };
 
     Sao.DateTime.min = moment(new Date(-100000000 * 86400000)).local();

src/view/form.js

@@ -1692,7 +1692,8 @@ function eval_pyson(value){
         },
         get modified() {
             if (this.record && this.field) {
-                var field_value = this.field.get_client(this.record);
+                var field_value = this.cast(
+                    this.field.get_client(this.record));
                 return (JSON.stringify(field_value) !=
                     JSON.stringify(this.get_value()));
             }
@@ -1711,7 +1712,13 @@ function eval_pyson(value){
                     this.icon.show();
                 }
             }
-        }
+        },
+        cast: function(value){
+            if (value && value.isDateTime) {
+                value = value.todate();
+            }
+            return value;
+        },
     });
 
     Sao.View.Form.DateTime = Sao.class_(Sao.View.Form.Date, {
@@ -1730,6 +1737,9 @@ function eval_pyson(value){
                 return this._default_format;
             }
         },
+        cast: function(value){
+            return value;
+        },
     });
 
     Sao.View.Form.Time = Sao.class_(Sao.View.Form.Date, {
@@ -1754,6 +1764,12 @@ function eval_pyson(value){
                 return this._default_format;
             }
         },
+        cast: function(value){
+            if (value && value.isDateTime) {
+                value = value.totime();
+            }
+            return value;
+        },
     });
 
     Sao.View.Form.TimeDelta = Sao.class_(Sao.View.Form.Widget, {