diff --git a/js/common_functions.js b/js/common_functions.js
index a2a2e1d..6075d19 100644
--- a/js/common_functions.js
+++ b/js/common_functions.js
@@ -2005,35 +2005,31 @@ function html_escape(html)
 /*"*/
 function he(html){return html_escape(html);}
 
-function future_ms(ms)
-{
-	var c=new Date();
-	c.setUTCMilliseconds(c.getUTCMilliseconds()+ms);
-	return c;
+function future_ms(ms) {
+	return new Date(Date.now() + ms);
 }
-function future_s(s)
-{
-	var c=new Date();
-	c.setUTCSeconds(c.getUTCSeconds()+s);
-	return c;
+function future_s(s) {
+	return future_ms(s * 1000);
 }
-function future_m(m)
-{
-	return future_s(60*m);
+function future_m(m) {
+	return future_ms(m * 60000);
 }
-function future_h(h)
-{
-	return future_m(60*h);
+function future_h(h) {
+	return future_ms(h * 3600000);
 }
 
-function mssince(t,ref)
-{
-	if(!ref) ref=new Date();
-	return ref.getTime() - t.getTime();
+function mssince(t, ref = Date.now()) {
+	return ref instanceof Date ? ref.getTime() - t.getTime() : ref - t.getTime();
+}
+function ssince(t, ref) {
+	return mssince(t, ref) / 1000;
+}
+function msince(t, ref) {
+	return mssince(t, ref) / 60000;
+}
+function hsince(t, ref) {
+	return mssince(t, ref) / 3600000;
 }
-function ssince(t,ref) { return mssince(t,ref)/1000.0; }
-function msince(t,ref) { return mssince(t,ref)/60000.0; }
-function hsince(t,ref) { return mssince(t,ref)/3600000.0; }
 
 function sleep(ms)
 {
diff --git a/node/.eslintrc b/node/.eslintrc
index a806da0..a37aed9 100644
--- a/node/.eslintrc
+++ b/node/.eslintrc
@@ -1,25 +1,25 @@
 {
-  "extends": ["eslint:recommended", "eslint-config-prettier"],
-  "env": {
-    "node": true
-  },
-  "parserOptions": {
-    "ecmaVersion": 10
-  },
-  "plugins": ["prettier"],
-  "rules": {
-    "no-constant-condition": "off",
-    "no-dupe-else-if": "off",
-    "indent": "off",
-    "no-empty": "warn",
-    "no-inner-declarations": "warn",
-    "no-unreachable": "warn",
-    "no-undef": "warn",
-    "no-unused-vars": "warn",
-    "no-redeclare": "warn",
-    "curly": "error",
-    "prettier/prettier": "error",
-    "one-var": ["error", "never"],
-    "no-sequences": "error"
-  }
+	"extends": ["eslint:recommended", "eslint-config-prettier"],
+	"env": {
+		"node": true
+	},
+	"parserOptions": {
+		"ecmaVersion": 2021
+	},
+	"plugins": ["prettier"],
+	"rules": {
+		"no-constant-condition": "off",
+		"no-dupe-else-if": "off",
+		"indent": "off",
+		"no-empty": "warn",
+		"no-inner-declarations": "warn",
+		"no-unreachable": "warn",
+		"no-undef": "warn",
+		"no-unused-vars": "warn",
+		"no-redeclare": "warn",
+		"curly": "error",
+		"prettier/prettier": "error",
+		"one-var": ["error", "never"],
+		"no-sequences": "error"
+	}
 }