Add missing #include.

Oversight in b2c64f571 (the later branches already have this).
Per buildfarm.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/include/utils/date.h b/src/include/utils/date.h
index d1c34b2caf1..064951be3e3 100644
--- a/src/include/utils/date.h
+++ b/src/include/utils/date.h
@@ -17,7 +17,7 @@
 #include <math.h>
 
 #include "fmgr.h"
-
+#include "datatype/timestamp.h"
 
 typedef int32 DateADT;