diff --git a/app/javascript/components/ComplexDatationInput/components/ComplexDatationInput.jsx b/app/javascript/components/ComplexDatationInput/components/ComplexDatationInput.jsx
index b5a94d6bc..686ab0774 100644
--- a/app/javascript/components/ComplexDatationInput/components/ComplexDatationInput.jsx
+++ b/app/javascript/components/ComplexDatationInput/components/ComplexDatationInput.jsx
@@ -16,7 +16,8 @@ const ComplexDatationInput = (props) => {
         choiceSets: choiceSetsProps,
         selectedFormat: selectedFormatProps,
         fieldUuid,
-        componentPolicies
+        componentPolicies,
+        errors
     } = props
 
     const [choiceSets, setChoiceSets] = useState(choiceSetsProps)
@@ -110,9 +111,12 @@ const ComplexDatationInput = (props) => {
         setToState(to);
     }, [granularity])
 
-    let dateValid = isCurrentFormatValid();
-    let errorStl = dateValid ? {} : {border: "2px solid #f00"};
-    let errorMsg = dateValid ? "" : "Invalid value";
+    let fromDateValid = isCurrentFormatValid('from');
+    let toDateValid = isCurrentFormatValid('to');
+    let errorStl = {
+      "from": fromDateValid ? {} : {border: "2px solid #f00"},
+      "to": toDateValid ? {} : {border: "2px solid #f00"}
+    };
     let fmt = getFieldOptions().format;
 
     function _handleChangeBC(input) {
@@ -240,17 +244,18 @@ const ComplexDatationInput = (props) => {
         });
     }
 
-    function getCurrentFormat() {
+    function getCurrentFormat(input) {
         let d = getData();
         let f = getFieldOptions().format;
         return f.split('').map(function (k) {
-            return d['from'][k] ? k : d['to'][k] ? k : '';
+            return d[input][k] ? k : '';
         }).join('')
     }
 
-    function isCurrentFormatValid() {
-        let current = getCurrentFormat();
+    function isCurrentFormatValid(input) {
+        let current = getCurrentFormat(input);
         if (current === '' && !isRequired) return true;   // allow empty value if field is not required
+        if (current === '' && isRequired && getCurrentFormat(input === "from" ? "to" : "from") !== '') return true;
         let allowed = getAllowedFormats();
         return allowed.indexOf(current) > -1;
     }
@@ -274,13 +279,13 @@ const ComplexDatationInput = (props) => {
                     </div>
                 ) : null}
                 {fmt.includes('D') ? (
-                    <input style={errorStl} type="number" min="0" max="31" className="input-2 form-control"
+                    <input style={errorStl[input]} type="number" min="0" max="31" className="input-2 form-control"
                            value={input === 'from' ? fromState.D : toState.D}
                            onChange={_handleChangeDay(input)}/>
                 ) : null
                 }
                 {fmt.includes('M') ? (
-                    <select style={errorStl} className="form-control" value={input === 'from' ? fromState.M : toState.M}
+                    <select style={errorStl[input]} className="form-control" value={input === 'from' ? fromState.M : toState.M}
                             onChange={_handleChangeMonth(input)}>
                         <option value=""></option>
                         <option value="1">
@@ -322,26 +327,26 @@ const ComplexDatationInput = (props) => {
                     </select>) : null
                 }
                 {fmt.includes('Y') ? (
-                    <input style={errorStl} className="input-4 margin-right form-control"
+                    <input style={errorStl[input]} className="input-4 margin-right form-control"
                            type="number" min="0"
                            value={input === 'from' ? fromState.Y : toState.Y}
                            onChange={_handleChangeYear(input)}/>
                 ) : null
                 }
                 {fmt.includes('h') ? (
-                    <input style={errorStl} min="0" max="23" type="number" className="input-2 form-control"
+                    <input style={errorStl[input]} min="0" max="23" type="number" className="input-2 form-control"
                            value={input === 'from' ? fromState.h : toState.h}
                            onChange={_handleChangeHours(input)}/>
                 ) : null
                 }
                 {fmt.includes('m') ? (
-                    <input style={errorStl} min="0" max="59" type="number" className="input-2 form-control"
+                    <input style={errorStl[input]} min="0" max="59" type="number" className="input-2 form-control"
                            value={input === 'from' ? fromState.m : toState.m}
                            onChange={_handleChangeMinutes(input)}/>
                 ) : null
                 }
                 {fmt.includes('s') ? (
-                    <input style={errorStl} min="0" max="59" type="number" className="input-2 form-control"
+                    <input style={errorStl[input]} min="0" max="59" type="number" className="input-2 form-control"
                            value={input === 'from' ? fromState.s : toState.s}
                            onChange={_handleChangeSeconds(input)}/>
                 ) : null
@@ -353,21 +358,21 @@ const ComplexDatationInput = (props) => {
         )
     }
 
-    if (!fromState || !toState) return ""
+  if (!fromState || !toState) return ""
     return (
         <div>
             <div>{renderAllowedFormatsSelector()}</div>
             {selectedFormat === 'date_time' && (
-                <div>
-                    <div>{renderDateTimeInput('from')}</div>
-                    <div>{renderDateTimeInput('to')}</div>
-                    <span className="error helptext">{errorMsg}</span>
-                </div>
+              <div>
+                <div>{renderDateTimeInput('from', input)}</div>
+                <div>{renderDateTimeInput('to', input)}</div>
+                <div className="base-errors">{errors?.filter(e => e.field === input.split("#item_")[1].split("_json")[0])?.map(e => e.message)?.join(',')}</div>
+              </div>
             )}
-            {selectedFormat === 'datation_choice' && (
-                <RenderChoiceSetList
-                    choiceSets={choiceSets}
-                    locales={locales}
+          {selectedFormat === 'datation_choice' && (
+            <RenderChoiceSetList
+              choiceSets={choiceSets}
+              locales={locales}
                     getData={getData}
                     setData={setData}
                     setChoiceData={setChoiceData}
@@ -777,7 +782,6 @@ const ModalForm = (props) => {
                                     <div className="base-errors">
                                         {errorMsg}
                                     </div>
-
                                 </div>
                             </div>
                             <div className="modal-footer">
diff --git a/app/javascript/components/DateTimeInput/components/DateTimeInput.jsx b/app/javascript/components/DateTimeInput/components/DateTimeInput.jsx
index e273c268d..e122d1e3c 100644
--- a/app/javascript/components/DateTimeInput/components/DateTimeInput.jsx
+++ b/app/javascript/components/DateTimeInput/components/DateTimeInput.jsx
@@ -10,7 +10,8 @@ const DateTimeInput = (props) => {
   const {
     input,
     allowBC,
-    preventNegativeInput
+    preventNegativeInput,
+    errors
   } = props
 
   const [state, setState] = useState(false)
@@ -39,7 +40,6 @@ const DateTimeInput = (props) => {
 
   let dateValid = isCurrentFormatValid();
   let errorStl = dateValid ? {} : {border: "2px solid #f00"};
-  let errorMsg = dateValid ? "" : "Invalid value";
   let fmt = getFieldOptions().format;
 
   function _handleChangeDay(e) {
@@ -218,7 +218,8 @@ const DateTimeInput = (props) => {
           </select>) : null
         }
         {fmt.includes('Y') ? (
-          <input style={errorStl} type="number" min={preventNegativeInput ? "0" : "" } className="input-4 margin-right form-control" value={state.Y}
+          <input style={errorStl} type="number" min={preventNegativeInput ? "0" : ""}
+                 className="input-4 margin-right form-control" value={state.Y}
                  onChange={_handleChangeYear}/>
         ) : null
         }
@@ -238,7 +239,7 @@ const DateTimeInput = (props) => {
         ) : null
         }
       </div>
-      <span className="error helptext">{errorMsg}</span>
+      <div className="base-errors">{errors?.filter(e => e.field === input.split("#item_")[1].split("_json")[0])?.map(e => e.message)?.join(',')}</div>
     </div>
   );
 };
diff --git a/app/models/field/complex_datation.rb b/app/models/field/complex_datation.rb
index 495e1c98c..49ac12685 100644
--- a/app/models/field/complex_datation.rb
+++ b/app/models/field/complex_datation.rb
@@ -170,7 +170,13 @@ def edit_props(item)
       componentPolicies:
         {
           modal: "super-editor"
+        },
+      errors: item[:item].errors.map do |error|
+        {
+          message: error.message,
+          field: error.attribute
         }
+      end
     }
   end
 
@@ -276,18 +282,29 @@ class ComplexDatationValidator < ActiveModel::Validator
     def validate(record)
       attrib = Array.wrap(options[:attributes]).first
       value = record.public_send(attrib)
+      field = Field.find_by(uuid: attrib)
 
       return if value.blank?
-
       return if value['selected_format'] != "date_time"
+      to_value_empty = value['to'].keys.reject{|k| k=="BC"}.all? { |key| value['to'][key].blank? || value['to'][key].nil? }
+      from_value_empty = value['from'].keys.reject{|k| k=="BC"}.all? { |key| value['from'][key].blank? || value['from'][key].nil? }
+      return if to_value_empty && from_value_empty && !field.required
 
-      from_date_is_positive = value['from'].compact.except("BC").all? { |_, v| v.to_i >= 0 }
+      if to_value_empty && from_value_empty && field.required
+        record.errors.add(attrib, I18n.t('activerecord.errors.models.item.attributes.base.cant_be_blank'))
+        return
+      end
 
+      from_date_is_positive = value['from'].compact.except("BC").all? { |_, v| v.to_i >= 0 }
       to_date_is_positive = value['to'].compact.except("BC").all? { |_, v| v.to_i >= 0 }
 
-      return if to_date_is_positive && from_date_is_positive
+      allowed_formats = Field::ComplexDatation::FORMATS.select{|f| field.format.include?(f) || field.format == f}
+
+      current_from_format = field.format.chars.map {|char| value['from'][char].blank? || value['from'][char].nil? ? nil : char}.compact.join
+      current_to_format = field.format.chars.map {|char| value['to'][char].blank? || value['to'][char].nil? ? nil : char}.compact.join
 
-      record.errors.add(:base, :negative_dates)
+      record.errors.add(attrib, I18n.t('activerecord.errors.models.item.attributes.base.wrong_format', field_format: allowed_formats)) unless (allowed_formats.include?(current_from_format) || from_value_empty) && (allowed_formats.include?(current_to_format)  || to_value_empty)
+      record.errors.add(attrib, :negative_dates) if !to_date_is_positive || !from_date_is_positive
     end
   end
 end
diff --git a/app/models/field/date_time.rb b/app/models/field/date_time.rb
index 38f9541fa..072e50234 100644
--- a/app/models/field/date_time.rb
+++ b/app/models/field/date_time.rb
@@ -159,6 +159,17 @@ def sql_type
     "JSON"
   end
 
+  def edit_props(item)
+    {
+      errors: item[:item].errors.map do |error|
+        {
+          message: error.message,
+          field: error.attribute
+        }
+      end
+    }
+  end
+
   private
 
   def transform_value(v)
@@ -182,4 +193,31 @@ def coerce_to_array(values)
       array << values[key]
     end.compact
   end
+
+  def build_validators
+    [DateTimeValidator]
+  end
+
+  class DateTimeValidator < ActiveModel::Validator
+    def validate(record)
+      attrib = Array.wrap(options[:attributes]).first
+      value = record.public_send(attrib)
+      field = Field.find_by(uuid: attrib)
+
+      return if value.blank?
+      return if value.is_a?(Hash) && value.has_key?("raw_value")
+      return if value.keys.all? { |key| value[key].blank? || value[key].nil? } && !field.required
+
+      if value.keys.all? { |key| value[key].blank? || value[key].nil? } && field.required
+        record.errors.add(attrib, I18n.t('activerecord.errors.models.item.attributes.base.cant_be_blank'))
+        return
+      end
+
+      allowed_formats = Field::DateTime::FORMATS.select{|f| field.format.include?(f) || field.format == f}
+      current_format = field.format.chars.map {|char| value[char].blank? || value[char].nil? ? nil : char}.compact.join
+
+      record.errors.add(attrib, I18n.t('activerecord.errors.models.item.attributes.base.wrong_format', field_format: allowed_formats)) unless allowed_formats.include?(current_format)
+    end
+  end
 end
+
diff --git a/config/locales/app/en.yml b/config/locales/app/en.yml
index bcf631382..4f61dde8a 100644
--- a/config/locales/app/en.yml
+++ b/config/locales/app/en.yml
@@ -65,7 +65,9 @@ en:
         item:
           attributes:
             base:
+              cant_be_blank: "Must be present"
               negative_dates: "Negative dates must be entered with the option before Jesus Christ (if activated)"
+              wrong_format: "Do not respect the formats %{field_format}"
         field/choice_set:
           attributes:
             choice_set_id:
diff --git a/config/locales/app/fr.yml b/config/locales/app/fr.yml
index c4fa10b07..124c66d8e 100644
--- a/config/locales/app/fr.yml
+++ b/config/locales/app/fr.yml
@@ -67,7 +67,9 @@ fr:
         item:
           attributes:
             base:
+              cant_be_blank: "Doit être rempli(e)"
               negative_dates: "Les dates négatives doivent être saisies avec l'option avant Jesus Christ (si activée)"
+              wrong_format: "Ne respecte pas les formats %{field_format}"
         field/choice_set:
           attributes:
             choice_set_id: