diff --git a/definitions/mars/grib.edmm.4v.def b/definitions/mars/grib.edmm.4v.def
index a67edbf4e..c65e6f447 100644
--- a/definitions/mars/grib.edmm.4v.def
+++ b/definitions/mars/grib.edmm.4v.def
@@ -3,4 +3,9 @@ meta verificationDate        g1verificationdate(dataDate, dataTime, endStep) : r
 meta monthlyVerificationDate g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date            = monthlyVerificationDate;
 
+meta verificationYear          evaluate(verificationDate/10000);
+meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
+meta verificationMonth         evaluate( (verificationDate/100)%100 );
+meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );
+
 alias mars.number=perturbationNumber;
diff --git a/definitions/mars/grib.edmm.fc.def b/definitions/mars/grib.edmm.fc.def
index d158c9cbb..d2e08a576 100644
--- a/definitions/mars/grib.edmm.fc.def
+++ b/definitions/mars/grib.edmm.fc.def
@@ -3,6 +3,11 @@ meta verificationDate         g1verificationdate(dataDate, dataTime, endStep) :
 meta monthlyVerificationDate  g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date             = monthlyVerificationDate;
 
+meta verificationYear          evaluate(verificationDate/10000);
+meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
+meta verificationMonth         evaluate( (verificationDate/100)%100 );
+meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );
+
 # class e4
 # constant six = 6;
 
diff --git a/definitions/mars/grib.edmo.4v.def b/definitions/mars/grib.edmo.4v.def
index 74b72a81f..94d7f0d9e 100644
--- a/definitions/mars/grib.edmo.4v.def
+++ b/definitions/mars/grib.edmo.4v.def
@@ -3,6 +3,11 @@ meta  verificationDate       g1verificationdate(dataDate, dataTime, endStep) : r
 meta monthlyVerificationDate g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date            = monthlyVerificationDate;
 
+meta verificationYear          evaluate(verificationDate/10000);
+meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
+meta verificationMonth         evaluate( (verificationDate/100)%100 );
+meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );
+
 unalias mars.time;
 unalias mars.step;
 
diff --git a/definitions/mars/grib.edmo.fc.def b/definitions/mars/grib.edmo.fc.def
index f928b621e..d0744e69a 100644
--- a/definitions/mars/grib.edmo.fc.def
+++ b/definitions/mars/grib.edmo.fc.def
@@ -1,9 +1,14 @@
 # assert(local=1)
-meta  verificationDate       g1verificationdate(dataDate, dataTime, endStep) : read_only;
+meta verificationDate       g1verificationdate(dataDate, dataTime, endStep) : read_only;
 meta monthlyVerificationDate g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date            = monthlyVerificationDate;
 alias mars.step            = endStep;
 
+meta verificationYear          evaluate(verificationDate/10000);
+meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
+meta verificationMonth         evaluate( (verificationDate/100)%100 );
+meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );
+
 # class 3 is "er" which is 15 year re-analysis (ERA15)
 # Only ERA15 has time and step
 if(class != 3) {
diff --git a/definitions/mars/grib.ewmm.fc.def b/definitions/mars/grib.ewmm.fc.def
index 041665d0a..4234a0ace 100644
--- a/definitions/mars/grib.ewmm.fc.def
+++ b/definitions/mars/grib.ewmm.fc.def
@@ -3,6 +3,11 @@ meta verificationDate         g1verificationdate(dataDate, dataTime, endStep) :
 meta monthlyVerificationDate  g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date             = monthlyVerificationDate;
 
+meta verificationYear          evaluate(verificationDate/10000);
+meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
+meta verificationMonth         evaluate( (verificationDate/100)%100 );
+meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );
+
 #
 # See GRIB-422, GRIB-497, GRIB-766, GRIB-833
 #
diff --git a/definitions/mars/grib.ewmo.fc.def b/definitions/mars/grib.ewmo.fc.def
index f928b621e..d0744e69a 100644
--- a/definitions/mars/grib.ewmo.fc.def
+++ b/definitions/mars/grib.ewmo.fc.def
@@ -1,9 +1,14 @@
 # assert(local=1)
-meta  verificationDate       g1verificationdate(dataDate, dataTime, endStep) : read_only;
+meta verificationDate       g1verificationdate(dataDate, dataTime, endStep) : read_only;
 meta monthlyVerificationDate g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date            = monthlyVerificationDate;
 alias mars.step            = endStep;
 
+meta verificationYear          evaluate(verificationDate/10000);
+meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
+meta verificationMonth         evaluate( (verificationDate/100)%100 );
+meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );
+
 # class 3 is "er" which is 15 year re-analysis (ERA15)
 # Only ERA15 has time and step
 if(class != 3) {
diff --git a/definitions/mars/grib.mnth.4v.def b/definitions/mars/grib.mnth.4v.def
index 2c0567bb1..73fc6cf01 100644
--- a/definitions/mars/grib.mnth.4v.def
+++ b/definitions/mars/grib.mnth.4v.def
@@ -2,3 +2,8 @@
 meta verificationDate        g1verificationdate(dataDate, dataTime, endStep) : read_only;
 meta monthlyVerificationDate g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date            = monthlyVerificationDate;
+
+meta verificationYear          evaluate(verificationDate/10000);
+meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
+meta verificationMonth         evaluate( (verificationDate/100)%100 );
+meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );
diff --git a/definitions/mars/grib.mnth.fc.def b/definitions/mars/grib.mnth.fc.def
index 8898af6cd..47b5c83f5 100644
--- a/definitions/mars/grib.mnth.fc.def
+++ b/definitions/mars/grib.mnth.fc.def
@@ -3,6 +3,10 @@ meta verificationDate         g1verificationdate(dataDate, dataTime, endStep) :
 meta monthlyVerificationDate  g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date             = monthlyVerificationDate;
 
+meta verificationYear          evaluate(verificationDate/10000);
+meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
+meta verificationMonth         evaluate( (verificationDate/100)%100 );
+meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );
 #
 # See GRIB-497, GRIB-766, GRIB-833
 #
diff --git a/definitions/mars/grib.mnth.ssd.def b/definitions/mars/grib.mnth.ssd.def
index 4d4ca9a40..eb577f46e 100644
--- a/definitions/mars/grib.mnth.ssd.def
+++ b/definitions/mars/grib.mnth.ssd.def
@@ -3,6 +3,11 @@ meta verificationDate         g1verificationdate(dataDate, dataTime, endStep) :
 meta monthlyVerificationDate  g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date             = monthlyVerificationDate;
 
+meta verificationYear          evaluate(verificationDate/10000);
+meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
+meta verificationMonth         evaluate( (verificationDate/100)%100 );
+meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );
+
 # class e4
 # constant six = 6;
 alias mars.step = startStep;
diff --git a/definitions/mars/grib.moda.4v.def b/definitions/mars/grib.moda.4v.def
index dd11a5997..36702cebf 100644
--- a/definitions/mars/grib.moda.4v.def
+++ b/definitions/mars/grib.moda.4v.def
@@ -3,5 +3,10 @@ meta verificationDate        g1verificationdate(dataDate, dataTime, endStep) : r
 meta monthlyVerificationDate g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date            = monthlyVerificationDate;
 
+meta verificationYear          evaluate(verificationDate/10000);
+meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
+meta verificationMonth         evaluate( (verificationDate/100)%100 );
+meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );
+
 unalias mars.time;
 unalias mars.step;
diff --git a/definitions/mars/grib.moda.fc.def b/definitions/mars/grib.moda.fc.def
index 5c38769b9..ad96bb391 100644
--- a/definitions/mars/grib.moda.fc.def
+++ b/definitions/mars/grib.moda.fc.def
@@ -4,6 +4,11 @@ meta verificationDate        g1verificationdate(dataDate, dataTime, endStep) : r
 meta monthlyVerificationDate g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date            = monthlyVerificationDate;
 
+meta verificationYear          evaluate(verificationDate/10000);
+meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
+meta verificationMonth         evaluate( (verificationDate/100)%100 );
+meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );
+
 # class 3 is "er" which is 15 year re-analysis (ERA15)
 # Only ERA15 has time and step
 if(class != 3) {
diff --git a/definitions/mars/grib.wamd.fc.def b/definitions/mars/grib.wamd.fc.def
index 1a53683d0..5a6bcc987 100644
--- a/definitions/mars/grib.wamd.fc.def
+++ b/definitions/mars/grib.wamd.fc.def
@@ -5,6 +5,11 @@ meta monthlyVerificationDate g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date            = monthlyVerificationDate;
 alias mars.step            = startStep;
 
+meta verificationYear          evaluate(verificationDate/10000);
+meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
+meta verificationMonth         evaluate( (verificationDate/100)%100 );
+meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );
+
 # class 3 is "er" which is 15 year re-analysis (ERA15)
 # Only ERA15 has time and step
 if(class != 3) {
diff --git a/definitions/mars/grib.wamo.fc.def b/definitions/mars/grib.wamo.fc.def
index 8898af6cd..9e87ba96f 100644
--- a/definitions/mars/grib.wamo.fc.def
+++ b/definitions/mars/grib.wamo.fc.def
@@ -3,6 +3,11 @@ meta verificationDate         g1verificationdate(dataDate, dataTime, endStep) :
 meta monthlyVerificationDate  g1monthlydate(verificationDate) : dump,no_copy;
 alias mars.date             = monthlyVerificationDate;
 
+meta verificationYear          evaluate(verificationDate/10000);
+meta monthlyVerificationYear   evaluate(monthlyVerificationDate/10000);
+meta verificationMonth         evaluate( (verificationDate/100)%100 );
+meta monthlyVerificationMonth  evaluate( (monthlyVerificationDate/100)%100 );
+
 #
 # See GRIB-497, GRIB-766, GRIB-833
 #