diff --git a/src/main/java/net/frozenorb/apiv3/route/grants/POSTGrants.java b/src/main/java/net/frozenorb/apiv3/route/grants/POSTGrants.java
index 5991f6a..f09ea0e 100644
--- a/src/main/java/net/frozenorb/apiv3/route/grants/POSTGrants.java
+++ b/src/main/java/net/frozenorb/apiv3/route/grants/POSTGrants.java
@@ -65,8 +65,9 @@ public final class POSTGrants implements Handler<RoutingContext> {
 
         Instant expiresAt = null;
 
-        if (requestBody.containsKey("expiresAt") && requestBody.getLong("expiresAt") != -1) {
-            expiresAt = Instant.ofEpochMilli(requestBody.getLong("expiresAt"));
+        if (requestBody.containsKey("expiresIn") && requestBody.getLong("expiresIn") != -1) {
+            long expiresInMillis = requestBody.getLong("expiresIn") * 1000;
+            expiresAt = Instant.ofEpochMilli(System.currentTimeMillis() + expiresInMillis);
         }
 
         if (expiresAt != null && expiresAt.isBefore(Instant.now())) {
diff --git a/src/main/java/net/frozenorb/apiv3/route/ipBans/POSTIpBans.java b/src/main/java/net/frozenorb/apiv3/route/ipBans/POSTIpBans.java
index 82f2b08..364a65c 100644
--- a/src/main/java/net/frozenorb/apiv3/route/ipBans/POSTIpBans.java
+++ b/src/main/java/net/frozenorb/apiv3/route/ipBans/POSTIpBans.java
@@ -35,8 +35,9 @@ public final class POSTIpBans implements Handler<RoutingContext> {
 
         Instant expiresAt = null;
 
-        if (requestBody.containsKey("expiresAt") && requestBody.getLong("expiresAt") != -1) {
-            expiresAt = Instant.ofEpochMilli(requestBody.getLong("expiresAt"));
+        if (requestBody.containsKey("expiresIn") && requestBody.getLong("expiresIn") != -1) {
+            long expiresInMillis = requestBody.getLong("expiresIn") * 1000;
+            expiresAt = Instant.ofEpochMilli(System.currentTimeMillis() + expiresInMillis);
         }
 
         if (expiresAt != null && expiresAt.isBefore(Instant.now())) {
diff --git a/src/main/java/net/frozenorb/apiv3/route/punishments/POSTPunishments.java b/src/main/java/net/frozenorb/apiv3/route/punishments/POSTPunishments.java
index 8e91985..2840158 100644
--- a/src/main/java/net/frozenorb/apiv3/route/punishments/POSTPunishments.java
+++ b/src/main/java/net/frozenorb/apiv3/route/punishments/POSTPunishments.java
@@ -63,8 +63,9 @@ public final class POSTPunishments implements Handler<RoutingContext> {
 
         Instant expiresAt = null;
 
-        if (requestBody.containsKey("expiresAt") && requestBody.getLong("expiresAt") != -1) {
-            expiresAt = Instant.ofEpochMilli(requestBody.getLong("expiresAt"));
+        if (requestBody.containsKey("expiresIn") && requestBody.getLong("expiresIn") != -1) {
+            long expiresInMillis = requestBody.getLong("expiresIn") * 1000;
+            expiresAt = Instant.ofEpochMilli(System.currentTimeMillis() + expiresInMillis);
         }
 
         if (expiresAt != null && expiresAt.isBefore(Instant.now())) {