From 0bcb9878b19964fc0cfe7f744d31b21718117dd9 Mon Sep 17 00:00:00 2001
From: Richard Zink <Richard Zink>
Date: Wed, 7 Oct 2026 13:14:45 +0200
Subject: [PATCH] Strict ISO 8601 tokens: MM=month (always), mm=minute

---
 config.js  | 19 ++++++++++---------
 index.html | 25 +++++++++++++------------
 2 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/config.js b/config.js
index 27e43b2..841979a 100644
--- a/config.js
+++ b/config.js
@@ -13,23 +13,24 @@
  *               window.TRANSLATIONS in i18n.js. English ('en') is the base;
  *               if a key is missing in the current language, English is used.
  *
- * timeFormat  - Format string for the digital clock, using ISO-8601-ish
- *               tokens. Any character that is not a token is treated as a
- *               literal (including whitespace).
+ * timeFormat  - Format string for the digital clock, using strict
+ *               ISO 8601 tokens (case-sensitive). Any other character is
+ *               treated as a literal (including whitespace).
  *
  *                 YYYY   4-digit year          (2026)
- *                 MM     month 01-12          (10)
+ *                 MM     month 01-12          (10) - always month
  *                 DD     day 01-31            (07)
  *                 HH     hour 00-23 (24h)     (14)
- *                 hh     hour 01-12 (12h)     (02)
- *                 a      AM / PM             (PM)
- *                 mm     minute 00-59        (35)
- *                 ss     second 00-59        (22)
+ *                 mm     minute 00-59        (35) - lowercase!
+ *                 ss     second 00-59        (22) - lowercase!
  *                 sss    millisecond 000-999 (456)
+ *                 T      literal 'T'
  *
  *               Date-only forms:  YYYY,  YYYY-MM,  YYYY-MM-DD
  *               Date-time forms:   above + T + HH:mm,  HH:mm:ss,  HH:mm:ss.sss
- *               Any other character is a literal (incl. spaces).
+ *               Any other character is a literal (incl. spaces, tabs, \n).
+ *
+ *               Note: MM is ALWAYS month (ISO). For minutes use mm (lowercase).
  *
  *               Examples:
  *                 'HH:mm:ss'                 -> 14:35:22
diff --git a/index.html b/index.html
index a937142..7427d81 100644
--- a/index.html
+++ b/index.html
@@ -812,7 +812,16 @@ var effect = (VANTA.CLOUDS2 || VANTA.CLOUDS)({
         function pad3(n) { return n < 10 ? '00' + n : n < 100 ? '0' + n : '' + n; }
 
         function formatDateTime(format, date) {
-            // Parse ISO-8601-ish format string and replace tokens with date values
+            // Strict ISO 8601 format tokens (case-sensitive):
+            //   YYYY  4-digit year         (2026)
+            //   MM    month 01-12          (10) -- always month, never minute
+            //   DD    day 01-31            (07)
+            //   HH    hour 00-23           (14)
+            //   mm    minute 00-59         (35) -- lowercase
+            //   ss    second 00-59         (22) -- lowercase
+            //   sss   millisecond 000-999  (456)
+            //   T     literal 'T'
+            // Any other character is a literal (including whitespace).
             var result = '';
             var i = 0;
             while (i < format.length) {
@@ -832,23 +841,15 @@ var effect = (VANTA.CLOUDS2 || VANTA.CLOUDS)({
                 } else if (ch === 'H' && format.substr(i, 2) === 'HH') {
                     result += pad2(date.getHours());
                     i += 2;
-                } else if (ch === 'h' && format.substr(i, 2) === 'hh') {
-                    var h12 = date.getHours() % 12;
-                    if (h12 === 0) h12 = 12;
-                    result += pad2(h12);
-                    i += 2;
-                } else if (ch === 'a') {
-                    result += date.getHours() < 12 ? 'AM' : 'PM';
-                    i += 1;
                 } else if (ch === 'm' && format.substr(i, 2) === 'mm') {
                     result += pad2(date.getMinutes());
                     i += 2;
-                } else if (ch === 's' && format.substr(i, 2) === 'ss') {
-                    result += pad2(date.getSeconds());
-                    i += 2;
                 } else if (ch === 's' && format.substr(i, 3) === 'sss') {
                     result += pad3(date.getMilliseconds());
                     i += 3;
+                } else if (ch === 's' && format.substr(i, 2) === 'ss') {
+                    result += pad2(date.getSeconds());
+                    i += 2;
                 } else {
                     result += ch;
                     i += 1;