diff --git a/lib/internal/fs/utils.js b/lib/internal/fs/utils.js
index 6cd6f7aceb2848..24d946edf7288a 100644
--- a/lib/internal/fs/utils.js
+++ b/lib/internal/fs/utils.js
@@ -286,6 +286,12 @@ function nsFromTimeSpecBigInt(sec, nsec) {
   return sec * kNsPerSecBigInt + nsec;
 }
 
+// The Date constructor performs Math.floor() to the timestamp.
+// https://www.ecma-international.org/ecma-262/#sec-timeclip
+// Since there may be a precision loss when the timestamp is
+// converted to a floating point number, we manually round
+// the timestamp here before passing it to Date().
+// Refs: https://github.com/nodejs/node/pull/12607
 function dateFromMs(ms) {
   return new Date(Number(ms) + 0.5);
 }