diff --git a/util/update_public_suffix_list.sh b/util/update_public_suffix_list.sh
index 80d5f2d175b..e261df74e9e 100755
--- a/util/update_public_suffix_list.sh
+++ b/util/update_public_suffix_list.sh
@@ -54,14 +54,14 @@ check_or_die output -w "$PSL_DATA_CPP"
 check_or_die binary-output -w "$PUBLIC_SUFFIX_LIST_DAFSA"
 
 GITSHA1=$(cd "$PUBLIC_SUFFIX_LIST_DAT_DIR" && git log -1 --format=format:%H)
-TODAY=$(date +%Y-%m-%d)
-msg "Using $INPUT @ $GITSHA1, fetched on $TODAY"
+GITDATE=$(cd "$PUBLIC_SUFFIX_LIST_DAT_DIR" && git log -1 --format=format:%cs)
+msg "Using $INPUT @ $GITSHA1, fetched on $GITDATE"
 
 run_or_die "$MAKE_DAFSA" "$INPUT" "$PSL_DATA_CPP"
 run_or_die "$MAKE_DAFSA" --output-format=binary "$INPUT" "$PUBLIC_SUFFIX_LIST_DAFSA"
 
 # update the first Version line in qt_attribution.json with the new SHA1 and date:
-run_or_die sed -i -e "1,/\"Version\":/{ /\"Version\":/ {  s/[0-9a-fA-F]\{40\}/$GITSHA1/;   s/[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}/$TODAY/ } }" "$ATTRIBUTION_JSON"
+run_or_die sed -i -e "1,/\"Version\":/{ /\"Version\":/ {  s/[0-9a-fA-F]\{40\}/$GITSHA1/;   s/[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}/$GITDATE/ } }" "$ATTRIBUTION_JSON"
 
 # update the first "PURL" line with the new SHA1:
 run_or_die sed -i -e "1,/\"PURL\":/{ /\"PURL\":/ { s/[0-9a-fA-F]\{40\}/$GITSHA1/; } }" "$ATTRIBUTION_JSON"
@@ -73,7 +73,7 @@ run_or_die git add "$ATTRIBUTION_JSON"
 run_or_die git commit -m "Update public suffix list
 
 Version $GITSHA1, fetched on
-$TODAY.
+$GITDATE.
 
 [ChangeLog][Third-Party Code] Updated the public suffix list to upstream
 SHA $GITSHA1.