diff --git a/pkgs/development/compilers/flutter/flutter.nix b/pkgs/development/compilers/flutter/flutter.nix
index a02c9bb8d114..1f732f81476a 100644
--- a/pkgs/development/compilers/flutter/flutter.nix
+++ b/pkgs/development/compilers/flutter/flutter.nix
@@ -49,7 +49,9 @@ let
         # expected to fail completely. A blank repository needs to be created.
         if [ ! -d .git ]; then
           git init -b nixpkgs
-          GIT_AUTHOR_NAME=Nixpkgs GIT_COMMITTER_NAME=Nixpkgs GIT_AUTHOR_EMAIL= GIT_COMMITTER_EMAIL= \
+          GIT_AUTHOR_NAME=Nixpkgs GIT_COMMITTER_NAME=Nixpkgs \
+          GIT_AUTHOR_EMAIL= GIT_COMMITTER_EMAIL= \
+          GIT_AUTHOR_DATE='1/1/1970 00:00:00 +0000' GIT_COMMITTER_DATE='1/1/1970 00:00:00 +0000' \
             git commit --allow-empty -m "Initial commit"
           (. '${../../../build-support/fetchgit/deterministic-git}'; make_deterministic_repo .)
         fi