diff --git a/release/Makefile.azure b/release/Makefile.azure
index e53d1a654618..310b0eb97da8 100644
--- a/release/Makefile.azure
+++ b/release/Makefile.azure
@@ -17,7 +17,7 @@ AZURE${VAR}!=	grep -E ^AZURE${VAR} ${AZURE_UPLOAD_CONF} | awk -F'	' '{print $$2}
 .endif
 
 .if ${BRANCH} == "STABLE" || ${BRANCH} == "CURRENT" || ${BRANCH} == "PRERELEASE"
-SNAPSHOT_DATE!=		date +-%Y-%m-%d-%H:%M
+SNAPSHOT_DATE!=		date +-%Y-%m-%d-%H-%M
 .endif
 
 AZURE_TARGET:=		${OSRELEASE}${SNAPSHOT_DATE}.vhd
diff --git a/release/Makefile.ec2 b/release/Makefile.ec2
index cbea5e68d2b3..f0b4459daffd 100644
--- a/release/Makefile.ec2
+++ b/release/Makefile.ec2
@@ -6,7 +6,7 @@
 #
 
 .if ${BRANCH} == "CURRENT" || ${BRANCH} == "STABLE" || ${BRANCH} == "PRERELEASE"
-AMINAMESUFFIX!=	date +-%Y-%m-%d-%H:%M
+AMINAMESUFFIX!=	date +-%Y-%m-%d-%H-%M
 .endif
 .if defined(EC2PUBLIC)
 PUBLISH=	--public