Add settings to enable 24-hour time format and customizable date format (#2347)

* Add setting to enable 24-hour time format

* added hour24Clock to TimeProps

* Add incomplete dateFormatString setting

* Move 24-hour  toggle to Appearance

* Add "Date & Time" subheading, cleanup after merge

* Add setting for date formatting

* Fix minor formatting and naming issues

* Document functions

* adress most comments

* add hint for date formatting

* add support for 24hr time to TimePicker

* prevent overflow on small displays

src/app/atoms/time/Time.jsx

@@ -4,10 +4,25 @@ import PropTypes from 'prop-types';
 import dateFormat from 'dateformat';
 import { isInSameDay } from '../../../util/common';
 
-function Time({ timestamp, fullTime }) {
+/**
+ * Renders a formatted timestamp.
+ *
+ * Displays the time in hour:minute format if the message is from today or yesterday, unless `fullTime` is true.
+ * For older messages, it shows the date and time.
+ *
+ * @param {number} timestamp - The timestamp to display.
+ * @param {boolean} [fullTime=false] - If true, always show the full date and time.
+ * @param {boolean} hour24Clock - Whether to use 24-hour time format.
+ * @param {string} dateFormatString - Format string for the date part.
+ * @returns {JSX.Element} A <time> element with the formatted date/time.
+ */
+function Time({ timestamp, fullTime, hour24Clock, dateFormatString }) {
   const date = new Date(timestamp);
 
-  const formattedFullTime = dateFormat(date, 'dd mmmm yyyy, hh:MM TT');
+  const formattedFullTime = dateFormat(
+    date,
+    hour24Clock ? 'dd mmmm yyyy, HH:MM' : 'dd mmmm yyyy, hh:MM TT'
+  );
   let formattedDate = formattedFullTime;
 
   if (!fullTime) {
@@ -16,17 +31,19 @@ function Time({ timestamp, fullTime }) {
     compareDate.setDate(compareDate.getDate() - 1);
     const isYesterday = isInSameDay(date, compareDate);
 
-    formattedDate = dateFormat(date, isToday || isYesterday ? 'hh:MM TT' : 'dd/mm/yyyy');
+    const timeFormat = hour24Clock ? 'HH:MM' : 'hh:MM TT';
+
+    formattedDate = dateFormat(
+      date,
+      isToday || isYesterday ? timeFormat : dateFormatString.toLowerCase()
+    );
     if (isYesterday) {
       formattedDate = `Yesterday, ${formattedDate}`;
     }
   }
 
   return (
-    <time
-      dateTime={date.toISOString()}
-      title={formattedFullTime}
-    >
+    <time dateTime={date.toISOString()} title={formattedFullTime}>
       {formattedDate}
     </time>
   );
@@ -39,6 +56,8 @@ Time.defaultProps = {
 Time.propTypes = {
   timestamp: PropTypes.number.isRequired,
   fullTime: PropTypes.bool,
+  hour24Clock: PropTypes.bool.isRequired,
+  dateFormatString: PropTypes.string.isRequired,
 };
 
 export default Time;