implement custom date/time formatting for Alt + T

src/public/app/services/utils.js

@@ -73,8 +73,32 @@ function formatDateISO(date) {
     return `${date.getFullYear()}-${padNum(date.getMonth() + 1)}-${padNum(date.getDate())}`;
 }
 
-function formatDateTime(date) {
-    return `${formatDate(date)} ${formatTime(date)}`;
+// old version
+// function formatDateTime(date) {
+//     return `${formatDate(date)} ${formatTime(date)}`;
+// }
+
+// In utils.js
+// import dayjs from 'dayjs'; // Assuming dayjs is available in this scope
+
+function formatDateTime(date, userSuppliedFormat) {
+    const DEFAULT_FORMAT = 'YYYY-MM-DD HH:mm';
+    let formatToUse = DEFAULT_FORMAT; 
+
+    if (userSuppliedFormat && typeof userSuppliedFormat === 'string' && userSuppliedFormat.trim() !== "") {
+        formatToUse = userSuppliedFormat.trim();
+    }
+
+    if (!date) {
+        date = new Date(); 
+    }
+
+    try {
+        return dayjs(date).format(formatToUse);
+    } catch (e) {
+        console.warn(`Trilium: Day.js encountered an error with format string "${formatToUse}". Falling back to default. Error: ${e.message}`);
+        return dayjs(date).format(DEFAULT_FORMAT); 
+    }
 }
 
 function localNowDateTime() {

src/public/app/widgets/type_widgets/editable_text.js

@@ -225,10 +225,29 @@ export default class EditableTextTypeWidget extends AbstractTextTypeWidget {
         }
     }
 
-    insertDateTimeToTextCommand() {
-        const date = new Date();
-        const dateString = utils.formatDateTime(date);
+    // old version
+    // insertDateTimeToTextCommand() {
+    //     const date = new Date();
+    //     const dateString = utils.formatDateTime(date);
 
+    //     this.addTextToEditor(dateString);
+    // }
+
+    // new version
+    async insertDateTimeToTextCommand() {
+        const date = new Date();
+        let userPreferredFormat = ""; //Default
+
+        try {
+            const allOptions = await server.get('options');
+            
+            if (allOptions && typeof allOptions.customDateTimeFormatString === 'string') {
+                userPreferredFormat = allOptions.customDateTimeFormatString;
+            }
+        } catch (e) {
+            console.error("Trilium: Failed to fetch options for custom date/time format. Using default.", e);
+        }
+        const dateString = utils.formatDateTime(date, userPreferredFormat);
         this.addTextToEditor(dateString);
     }
 

src/public/app/widgets/type_widgets/options/text_notes/date_time_format.js

@@ -47,7 +47,6 @@ export default class DateTimeFormatOptions extends OptionsWidget {
     }
 
     async optionsLoaded(options) {
-        //todo: update the key in updateOption
         const currentFormat = options.customDateTimeFormatString || "";
 
         

src/routes/api/options.js

@@ -57,7 +57,8 @@ const ALLOWED_OPTIONS = new Set([
     'customSearchEngineName',
     'customSearchEngineUrl',
     'promotedAttributesOpenInRibbon',
-    'editedNotesOpenInRibbon'
+    'editedNotesOpenInRibbon',
+    'customDateTimeFormatString'
 ]);
 
 function getOptions() {