From fe48ff340d7d7bdc3321c9292f96b82412ebb3c8 Mon Sep 17 00:00:00 2001
From: Greg <gregman@livingonlinenow.com>
Date: Sat, 31 May 2025 08:28:46 +0200
Subject: [PATCH] feat: add core utility functions for date formatting,
 validation, and UI helpers

---
 js/utils.js | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/js/utils.js b/js/utils.js
index 5dbb02b..a2b93a5 100644
--- a/js/utils.js
+++ b/js/utils.js
@@ -202,6 +202,41 @@ const Utils = (() => {
         return dateStr; // Fallback: return original if not recognized
     };
 
+    /**
+     * Convert a date string from DD/MM/YYYY to YYYY-MM-DD (ISO).
+     * @param {string} uiDate - Date in DD/MM/YYYY
+     * @returns {string} - Date in YYYY-MM-DD
+     */
+    const toISODate = (uiDate) => {
+        if (!uiDate) return '';
+        const parts = uiDate.match(/^(\d{1,2})\/(\d{1,2})\/(\d{4})$/);
+        if (parts) {
+            const day = String(parts[1]).padStart(2, '0');
+            const month = String(parts[2]).padStart(2, '0');
+            const year = parts[3];
+            return `${year}-${month}-${day}`;
+        }
+        // If already in ISO format, return as is
+        if (/^\d{4}-\d{2}-\d{2}$/.test(uiDate)) return uiDate;
+        return uiDate;
+    };
+
+    /**
+     * Convert a date string from YYYY-MM-DD (ISO) to DD/MM/YYYY for UI.
+     * @param {string} isoDate - Date in YYYY-MM-DD
+     * @returns {string} - Date in DD/MM/YYYY
+     */
+    const toUIDate = (isoDate) => {
+        if (!isoDate) return '';
+        const parts = isoDate.match(/^(\d{4})-(\d{2})-(\d{2})$/);
+        if (parts) {
+            return `${parts[3]}/${parts[2]}/${parts[1]}`;
+        }
+        // If already in UI format, return as is
+        if (/^\d{1,2}\/\d{1,2}\/\d{4}$/.test(isoDate)) return isoDate;
+        return isoDate;
+    };
+
     return {
         formatDate,
         getTodayDate,
@@ -211,6 +246,7 @@ const Utils = (() => {
         calculateWeightStats,
         copyToClipboard,
         sanitizeHTML,
-        uiDateToISO // Export the new function
+        toISODate,
+        toUIDate
     };
 })();