diff --git a/source/engine/date.ts b/source/engine/date.ts
new file mode 100644
index 000000000..50ad3199e
--- /dev/null
+++ b/source/engine/date.ts
@@ -0,0 +1,18 @@
+const dateRegexp = /[\d]{2}\/[\d]{2}\/[\d]{4}/
+
+export function convertToDateIfNeeded(...values: string[]) {
+	const dateStrings = values.map(dateString => '' + dateString)
+	if (!dateStrings.some(dateString => dateString.match(dateRegexp))) {
+		return values
+	}
+	dateStrings.forEach(dateString => {
+		if (!dateString.match(dateRegexp)) {
+			throw new TypeError(
+				`L'opérande '${dateString}' n'est pas une date valide`
+			)
+		}
+	})
+	return dateStrings
+		.map(date => date.split('/'))
+		.map(([jour, mois, année]) => new Date(+année, +mois - 1, +jour))
+}
diff --git a/source/engine/grammar.ne b/source/engine/grammar.ne
index 54dbd21ee..a548f1dd5 100644
--- a/source/engine/grammar.ne
+++ b/source/engine/grammar.ne
@@ -48,7 +48,7 @@ main ->
   | Comparison {% id %}
   | NonNumericTerminal {% id %}
   | Negation {% id %}
-  | %date {% date %}
+  | Date {% id %}
 
 NumericTerminal ->
 	 	Variable {% id %}
@@ -58,12 +58,19 @@ NumericTerminal ->
 
 Negation ->
     "-" %space Parentheses {% unaryOperation('calculation') %}
+
 Parentheses ->
     "(" AdditionSubstraction ")"  {% ([,e]) => e %}
   | "(" Negation ")" {% ([,e]) => e %}
   |  NumericTerminal               {% id %}
 
-Comparison -> Comparable %space %comparison %space Comparable {% binaryOperation('comparison')%}
+Date -> 
+    Variable {% id %}
+  | %date {% date %}
+
+Comparison -> 
+    Comparable %space %comparison %space Comparable {% binaryOperation('comparison')%}
+  | Date %space %comparison %space Date {% binaryOperation('comparison')%}
 
 Comparable -> (  AdditionSubstraction | NonNumericTerminal) {% ([[e]]) => e %}
 
diff --git a/source/engine/grammarFunctions.js b/source/engine/grammarFunctions.js
index a5d6c6069..30c03a3cc 100644
--- a/source/engine/grammarFunctions.js
+++ b/source/engine/grammarFunctions.js
@@ -74,7 +74,6 @@ export let date = ([{ value }], ...otherstuf) => {
 	return {
 		constant: {
 			type: 'date',
-			date,
 			nodeValue: `${jour}/${mois}/${année}`
 		}
 	}
diff --git a/source/engine/mecanisms/operation.js b/source/engine/mecanisms/operation.js
index fe97fed0e..5d662f2e0 100644
--- a/source/engine/mecanisms/operation.js
+++ b/source/engine/mecanisms/operation.js
@@ -3,25 +3,32 @@ import { Node } from 'Engine/mecanismViews/common'
 import { inferUnit } from 'Engine/units'
 import { curry, map } from 'ramda'
 import React from 'react'
+import { convertToDateIfNeeded } from '../date.ts'
 
 export default (k, operatorFunction, symbol) => (recurse, k, v) => {
 	let evaluate = (cache, situation, parsedRules, node) => {
-		let explanation = map(
-				curry(evaluateNode)(cache, situation, parsedRules),
-				node.explanation
-			),
-			value1 = explanation[0].nodeValue,
-			value2 = explanation[1].nodeValue,
-			nodeValue =
-				value1 == null || value2 == null
-					? null
-					: operatorFunction(value1, value2),
-			missingVariables = mergeMissing(
-				explanation[0].missingVariables,
-				explanation[1].missingVariables
-			)
+		const explanation = map(
+			curry(evaluateNode)(cache, situation, parsedRules),
+			node.explanation
+		)
+		const missingVariables = mergeMissing(
+			explanation[0].missingVariables,
+			explanation[1].missingVariables
+		)
 
-		return { ...node, nodeValue, explanation, missingVariables }
+		const value1 = explanation[0].nodeValue
+		const value2 = explanation[1].nodeValue
+		if (value1 == null || value2 == null) {
+			return { ...node, nodeValue: null, explanation, missingVariables }
+		}
+		let nodeValue = operatorFunction(...convertToDateIfNeeded(value1, value2))
+
+		return {
+			...node,
+			nodeValue,
+			explanation,
+			missingVariables
+		}
 	}
 
 	let explanation = v.explanation.map(recurse)
diff --git a/test/mécanismes/date.yaml b/test/mécanismes/date.yaml
index 11e752b00..4f9687888 100644
--- a/test/mécanismes/date.yaml
+++ b/test/mécanismes/date.yaml
@@ -4,6 +4,33 @@
     - valeur attendue: 08/02/2015
 
 - test: Défaut au premier jour du mois
-  formule: 02/2015
+  formule: 01/02/2015
   exemples:
     - valeur attendue: 01/02/2015
+
+- test: Comparaison sur les dates
+  formule: 02/03/2019 > 21/02/2019
+  exemples:
+    - valeur attendue: true
+
+- nom: date de création
+- test: Comparaison sur les dates avec référence
+  formule: date de création < 01/01/2010
+  exemples:
+    - situation:
+        date de création: 01/03/1992
+      valeur attendue: true
+    - situation:
+        date de création: 09/02/2019
+      valeur attendue: false
+
+- test: Applicable si
+  applicable si: date de création < 01/01/2010
+  formule: 10 €
+  exemples:
+    - situation:
+        date de création: 01/03/1992
+      valeur attendue: 10
+    - situation:
+        date de création: 09/02/2019
+      valeur attendue: 0