diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index 34cdbfe1..3c77ce3f 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -127,7 +127,8 @@ jobs:
           mkdir -p phreeqc/R
           mkdir -p phreeqc/data
           echo "# Generated by roxygen2: do not edit by hand" > phreeqc/NAMESPACE
-          make VERSION=${{ needs.init.outputs.VER }} RELEASE_DATE=${{ needs.init.outputs.DATE }} build
+          DATE=$(date -d ${{ needs.init.outputs.DATE }} "+%Y-%m-%d")
+          make VERSION=${{ needs.init.outputs.VER }} RELEASE_DATE=$DATE build
 
       - uses: actions/upload-artifact@v2
         with: