diff --git a/roles/nsd/tasks/zones.yml b/roles/nsd/tasks/zones.yml
index 32acf99..78093ba 100644
--- a/roles/nsd/tasks/zones.yml
+++ b/roles/nsd/tasks/zones.yml
@@ -9,7 +9,7 @@
     mode: "0o644"
   vars:
     # This generates 99 different serial per day
-    dns_serial: "{{ ansible_date_time.year }}{{ ansible_date_time.month }}{{ ansible_date_time.day }}{{ ((ansible_date_time.hour | int * 3600 + ansible_date_time.minute | int * 60 + ansible_date_time.second | int) * 99 / 86400) | int }}"
+    dns_serial: "{{ ansible_date_time.epoch }}"
 
 - name: Force zone file modification time
   ansible.builtin.file:
diff --git a/roles/nsd/templates/zones/libertus.eu.zone.j2 b/roles/nsd/templates/zones/libertus.eu.zone.j2
index 7e05590..ebe1272 100644
--- a/roles/nsd/templates/zones/libertus.eu.zone.j2
+++ b/roles/nsd/templates/zones/libertus.eu.zone.j2
@@ -1,6 +1,6 @@
 $TTL 86400
 @		SOA {{ groups['master_nsdservers'] | first }}. tech.ovh.net. (
-				{{ dns_serial }}; serial number YYMMDDNN
+				{{ dns_serial }}; timestamp serial number
 				28800; Refresh
 				7200; Retry
 				864000; Expire
diff --git a/roles/nsd/templates/zones/mateu.be.zone.j2 b/roles/nsd/templates/zones/mateu.be.zone.j2
index 6c77f6d..1e83dcc 100644
--- a/roles/nsd/templates/zones/mateu.be.zone.j2
+++ b/roles/nsd/templates/zones/mateu.be.zone.j2
@@ -1,6 +1,6 @@
 $TTL 86400
 @		SOA {{ groups['master_nsdservers'] | first }}. tech.ovh.net. (
-				{{ dns_serial }}; serial number YYMMDDNN
+				{{ dns_serial }}; timestamp serial number
 				28800; Refresh
 				7200; Retry
 				864000; Expire
diff --git a/roles/nsd/templates/zones/nintendojo.fr.zone.j2 b/roles/nsd/templates/zones/nintendojo.fr.zone.j2
index f9be331..246cbd6 100644
--- a/roles/nsd/templates/zones/nintendojo.fr.zone.j2
+++ b/roles/nsd/templates/zones/nintendojo.fr.zone.j2
@@ -1,6 +1,6 @@
 $TTL 86400
 @		SOA {{ groups['master_nsdservers'] | first }}. tech.ovh.net. (
-				{{ dns_serial }}; serial number YYMMDDNN
+				{{ dns_serial }}; timestamp serial number
 				28800; Refresh
 				7200; Retry
 				864000; Expire
diff --git a/roles/nsd/templates/zones/parking.zone.j2 b/roles/nsd/templates/zones/parking.zone.j2
index 5e34690..ca7a271 100644
--- a/roles/nsd/templates/zones/parking.zone.j2
+++ b/roles/nsd/templates/zones/parking.zone.j2
@@ -1,6 +1,6 @@
 $TTL 86400
 @		SOA {{ groups['master_nsdservers'] | first }}. tech.ovh.net. (
-				{{ dns_serial }}; serial number YYMMDDNN
+				{{ dns_serial }}; timestamp serial number
 				28800; Refresh
 				7200; Retry
 				864000; Expire
diff --git a/roles/nsd/templates/zones/pipoworld.fr.zone.j2 b/roles/nsd/templates/zones/pipoworld.fr.zone.j2
index 566a024..bbe82d2 100644
--- a/roles/nsd/templates/zones/pipoworld.fr.zone.j2
+++ b/roles/nsd/templates/zones/pipoworld.fr.zone.j2
@@ -1,6 +1,6 @@
 $TTL 86400
 @		SOA {{ groups['master_nsdservers'] | first }}. tech.ovh.net. (
-				{{ dns_serial }}; serial number YYMMDDNN
+				{{ dns_serial }}; timestamp serial number
 				28800; Refresh
 				7200; Retry
 				864000; Expire