# HG changeset patch
# User Tyler Trahan <tyler@tylertrahan.com>
# Date 2023-04-12 18:52:37
# Node ID 65ea8be28e55cb237d87784828724999b9a878af
# Parent  9f21e27136e89cd35edc884e12ce5db1f73fcb6e

Fix #10630: Don't allow shifting service date earlier than 0 (#10643)

diff --git a/src/vehicle.cpp b/src/vehicle.cpp
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -771,7 +771,7 @@ uint32 Vehicle::GetGRFID() const
  */
 void Vehicle::ShiftDates(int interval)
 {
-	this->date_of_last_service += interval;
+	this->date_of_last_service = std::max(this->date_of_last_service + interval, 0);
 }
 
 /**