Fix javascript time format (#26)

* Fix javascript time format

---------

Co-authored-by: Jackson Currie <[email protected]>
Co-authored-by: Dominik Krajcer <[email protected]>

Author: 3 people

web/system_date_time_format.js

@@ -0,0 +1,25 @@
+const getDateTimeFormatPattern = (options) => {
+    const parts = new Intl.DateTimeFormat(void 0, options).formatToParts(new Date());
+    const hasDayPeriod = parts.some(part => part.type === "dayPeriod");
+    return parts.map(part => {
+        switch (part.type) {
+            case "weekday": return "EEEE";
+            case "day": return "d".repeat(part.value.length);
+            case "month": return "M".repeat(Math.min(4, part.value.length));
+            case "year": return "y".repeat(part.value.length);
+            case "hour": return hasDayPeriod ? "h".repeat(part.value.length) : "H".repeat(part.value.length);
+            case "minute": return "m".repeat(part.value.length);
+            case "second": return "s".repeat(part.value.length);
+            case "literal": return part.value;
+            case "dayPeriod": return "a";
+            default: return "";
+        }
+    })
+    .join("");
+};
+
+const getDateFormat = () => getDateTimeFormatPattern({ dateStyle: "short" });
+const getMediumDateFormat = () => getDateTimeFormatPattern({ dateStyle: "medium" });
+const getLongDateFormat = () => getDateTimeFormatPattern({ dateStyle: "long" });
+const getFullDateFormat = () => getDateTimeFormatPattern({ dateStyle: "full" });
+const getTimeFormat = () => getDateTimeFormatPattern({ timeStyle: "short" });