Add "shortmonth" date option and fix existing month/date variables

- Adjust 0-based month values & use day-of-month for date
- Adjust documentation
- Fixes #1987

Signed-off-by: Roland Grunberg <rgrunber@redhat.com>

Author: rgrunber

document/_java.templateVariables.md

@@ -9,6 +9,7 @@ Below are the predefined variables you could use in the template settings such a
 - `${time}` - current system time
 - `${year}` - current year
 - `${month}` - current month
+- `${shortmonth}` - short form representation of current month
 - `${day}` - current day of the month
 - `${hour}` - current hour
 - `${minute}` - current minute

src/fileEventHandler.ts

@@ -67,11 +67,12 @@ async function handleNewJavaFiles(e: FileCreateEvent) {
             package_name: "",
             type_name: typeName,
             user: userInfo().username,
-            date: date.toLocaleDateString(),
+            date: date.toLocaleDateString(undefined, {month: "short", day: "2-digit", year: "numeric"}),
             time: date.toLocaleTimeString(),
             year: date.getFullYear(),
-            month: formatNumber(date.getMonth()),
-            day: formatNumber(date.getDay()),
+            month: formatNumber(date.getMonth() + 1),
+            shortmonth: date.toLocaleDateString(undefined, {month: "short"}),
+            day: formatNumber(date.getDate()),
             hour: formatNumber(date.getHours()),
             minute: formatNumber(date.getMinutes()),
         };