diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index a4e6882dae..4f0360fe6f 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -81,6 +81,7 @@ As a result, the following maven modules have been deleted: `sirius-web-sample-a
 - https://github.com/eclipse-sirius/sirius-web/issues/3899[#3899] [diagram] Fix an issue when using alt-tab shortcut and trying to drag a node afterwards
 - https://github.com/eclipse-sirius/sirius-web/issues/3911[#3911] [diagram] Fix overflow issue with labels, ensuring proper wrapping and ellipsis.
 - https://github.com/eclipse-sirius/sirius-web/issues/3933[#3933] [vs-code] Fix explorer in vscode extension
+- https://github.com/eclipse-sirius/sirius-web/issues/3920[#3920] [form] Fix DateTime widget default style not set
 
 === New Features
 
diff --git a/packages/view/backend/sirius-components-view-form/src/main/java/org/eclipse/sirius/components/view/form/adapters/FormColorAdapter.java b/packages/view/backend/sirius-components-view-form/src/main/java/org/eclipse/sirius/components/view/form/adapters/FormColorAdapter.java
index 9556eee586..b4e3c30ea4 100644
--- a/packages/view/backend/sirius-components-view-form/src/main/java/org/eclipse/sirius/components/view/form/adapters/FormColorAdapter.java
+++ b/packages/view/backend/sirius-components-view-form/src/main/java/org/eclipse/sirius/components/view/form/adapters/FormColorAdapter.java
@@ -19,6 +19,7 @@
 import org.eclipse.sirius.components.view.form.ButtonDescriptionStyle;
 import org.eclipse.sirius.components.view.form.CheckboxDescription;
 import org.eclipse.sirius.components.view.form.CheckboxDescriptionStyle;
+import org.eclipse.sirius.components.view.form.DateTimeDescriptionStyle;
 import org.eclipse.sirius.components.view.form.FormElementFor;
 import org.eclipse.sirius.components.view.form.FormElementIf;
 import org.eclipse.sirius.components.view.form.FormPackage;
@@ -52,6 +53,9 @@
  */
 public class FormColorAdapter extends EContentAdapter {
 
+    private static final String TRANSPARENT = "transparent";
+
+    private static final String TEXT_PRIMARY = "theme.palette.text.primary";
 
     private FormStyleSwitch formStyleSwitch;
 
@@ -149,7 +153,7 @@ public Void caseCheckboxDescriptionStyle(CheckboxDescriptionStyle object) {
         @Override
         public Void caseLabelDescriptionStyle(LabelDescriptionStyle object) {
             if (object.getColor() == null) {
-                object.setColor(this.colorPaletteService.getColorFromPalette(object, "theme.palette.text.primary"));
+                object.setColor(this.colorPaletteService.getColorFromPalette(object, TEXT_PRIMARY));
             }
             return null;
         }
@@ -157,7 +161,7 @@ public Void caseLabelDescriptionStyle(LabelDescriptionStyle object) {
         @Override
         public Void caseLinkDescriptionStyle(LinkDescriptionStyle object) {
             if (object.getColor() == null) {
-                object.setColor(this.colorPaletteService.getColorFromPalette(object, "theme.palette.text.primary"));
+                object.setColor(this.colorPaletteService.getColorFromPalette(object, TEXT_PRIMARY));
             }
             return null;
         }
@@ -165,7 +169,7 @@ public Void caseLinkDescriptionStyle(LinkDescriptionStyle object) {
         @Override
         public Void caseListDescriptionStyle(ListDescriptionStyle object) {
             if (object.getColor() == null) {
-                object.setColor(this.colorPaletteService.getColorFromPalette(object, "theme.palette.text.primary"));
+                object.setColor(this.colorPaletteService.getColorFromPalette(object, TEXT_PRIMARY));
             }
             return null;
         }
@@ -173,10 +177,10 @@ public Void caseListDescriptionStyle(ListDescriptionStyle object) {
         @Override
         public Void caseMultiSelectDescriptionStyle(MultiSelectDescriptionStyle object) {
             if (object.getBackgroundColor() == null) {
-                object.setBackgroundColor(this.colorPaletteService.getColorFromPalette(object, "transparent"));
+                object.setBackgroundColor(this.colorPaletteService.getColorFromPalette(object, TRANSPARENT));
             }
             if (object.getForegroundColor() == null) {
-                object.setForegroundColor(this.colorPaletteService.getColorFromPalette(object, "theme.palette.text.primary"));
+                object.setForegroundColor(this.colorPaletteService.getColorFromPalette(object, TEXT_PRIMARY));
             }
             return null;
         }
@@ -192,10 +196,10 @@ public Void caseRadioDescriptionStyle(RadioDescriptionStyle object) {
         @Override
         public Void caseSelectDescriptionStyle(SelectDescriptionStyle object) {
             if (object.getBackgroundColor() == null) {
-                object.setBackgroundColor(this.colorPaletteService.getColorFromPalette(object, "transparent"));
+                object.setBackgroundColor(this.colorPaletteService.getColorFromPalette(object, TRANSPARENT));
             }
             if (object.getForegroundColor() == null) {
-                object.setForegroundColor(this.colorPaletteService.getColorFromPalette(object, "theme.palette.text.primary"));
+                object.setForegroundColor(this.colorPaletteService.getColorFromPalette(object, TEXT_PRIMARY));
             }
             return null;
         }
@@ -203,10 +207,10 @@ public Void caseSelectDescriptionStyle(SelectDescriptionStyle object) {
         @Override
         public Void caseTextareaDescriptionStyle(TextareaDescriptionStyle object) {
             if (object.getBackgroundColor() == null) {
-                object.setBackgroundColor(this.colorPaletteService.getColorFromPalette(object, "transparent"));
+                object.setBackgroundColor(this.colorPaletteService.getColorFromPalette(object, TRANSPARENT));
             }
             if (object.getForegroundColor() == null) {
-                object.setForegroundColor(this.colorPaletteService.getColorFromPalette(object, "theme.palette.text.primary"));
+                object.setForegroundColor(this.colorPaletteService.getColorFromPalette(object, TEXT_PRIMARY));
             }
             return null;
         }
@@ -214,10 +218,21 @@ public Void caseTextareaDescriptionStyle(TextareaDescriptionStyle object) {
         @Override
         public Void caseTextfieldDescriptionStyle(TextfieldDescriptionStyle object) {
             if (object.getBackgroundColor() == null) {
-                object.setBackgroundColor(this.colorPaletteService.getColorFromPalette(object, "transparent"));
+                object.setBackgroundColor(this.colorPaletteService.getColorFromPalette(object, TRANSPARENT));
+            }
+            if (object.getForegroundColor() == null) {
+                object.setForegroundColor(this.colorPaletteService.getColorFromPalette(object, TEXT_PRIMARY));
+            }
+            return null;
+        }
+
+        @Override
+        public Void caseDateTimeDescriptionStyle(DateTimeDescriptionStyle object) {
+            if (object.getBackgroundColor() == null) {
+                object.setBackgroundColor(this.colorPaletteService.getColorFromPalette(object, TRANSPARENT));
             }
             if (object.getForegroundColor() == null) {
-                object.setForegroundColor(this.colorPaletteService.getColorFromPalette(object, "theme.palette.text.primary"));
+                object.setForegroundColor(this.colorPaletteService.getColorFromPalette(object, TEXT_PRIMARY));
             }
             return null;
         }