diff --git a/datetime/const.go b/datetime/const.go
index c98ef83..4d0d8cd 100644
--- a/datetime/const.go
+++ b/datetime/const.go
@@ -29,7 +29,9 @@ const (
 	MicrosecondPerSecond     = MicrosecondPerMillisecond * MillisecondPerSecond
 	NanosecondPerMillisecond = NanosecondPerMicrosecond * MicrosecondPerMillisecond
 	NanosecondPerSecond      = NanosecondPerMicrosecond * MicrosecondPerSecond
+)
 
+const (
 	// Unités supportées
 	NoUnit Unit = iota
 	Millisecond
@@ -49,7 +51,9 @@ const (
 
 	maskUnit  = 1<<bitsUnit - 1
 	maskValue = ^maskUnit
+)
 
+const (
 	// Précisions supportées
 	NoPrecision Precision = iota
 	PrecisionMillisecond
@@ -77,7 +81,9 @@ const (
 	maskYear  = ^(maskDay | maskMonth)
 
 	dateNil = date(0)
+)
 
+const (
 	// Mois
 	January = uint(1) + iota
 	February
@@ -91,7 +97,9 @@ const (
 	October
 	November
 	December
+)
 
+const (
 	// Jours de la semaine
 	Sunday = uint(iota)
 	Monday
@@ -108,12 +116,12 @@ var (
 		NoUnit:      "",
 		Millisecond: "ms",
 		Second:      "s",
-		Minute:      "m",
+		Minute:      "mn",
 		Hour:        "h",
-		Day:         "J",
-		Week:        "S",
-		Month:       "M",
-		Year:        "A",
+		Day:         "d",
+		Week:        "w",
+		Month:       "m",
+		Year:        "y",
 	}
 
 	maskDate = map[string]date{