Refine date format tokens for weekday number, and add support for day of year

See discussion at https://groups.google.com/g/tiddlywiki/c/tf23ByDXzxM/m/5Wx7PV36AwAJ

core/modules/utils/utils.js

@@ -383,12 +383,18 @@ exports.formatDateString = function(date,template) {
 			[/^0WW/, function() {
 				return $tw.utils.pad($tw.utils.getWeek(date));
 			}],
+			[/^0dddd/, function() {
+				return $tw.utils.pad(Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24),3);
+			}],
 			[/^dddd/, function() {
-				return [7,1,2,3,4,5,6][date.getDay()];
+				return Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);
 			}],
 			[/^ddd/, function() {
 				return $tw.language.getString("Date/Short/Day/" + date.getDay());
 			}],
+			[/^dd/, function() {
+				return [7,1,2,3,4,5,6][date.getDay()];
+			}],
 			[/^mmm/, function() {
 				return $tw.language.getString("Date/Short/Month/" + (date.getMonth() + 1));
 			}],

editions/tw5.com/tiddlers/features/DateFormat.tid

@@ -7,9 +7,11 @@ type: text/vnd.tiddlywiki
 When used to display date values (with the `format` attribute set to ''date''), the ViewWidget accepts a `template` attribute that allows the format of the date values to be specified. The format string is processed with the following substitutions:
 
 |!Token |!Substituted Value |
+|`dddd` |Day of year (1 to 365, or 366 for leap years) |
+|`0dddd` |Zero padded day of year (001 to 365, or 366 for leap years) 
 |`DDD` |Day of week in full (eg, "Monday") |
 |`ddd` |Short day of week (eg, "Mon") |
-|`dddd` |<<.from-version "5.2.0">> Weekday number from 1 through 7, beginning with Monday and ending with Sunday |
+|`dd` |<<.from-version "5.2.0">> Weekday number from 1 through 7, beginning with Monday and ending with Sunday |
 |`DD` |Day of month |
 |`0DD` |Adds a leading zero |
 |`DDth` |Adds a suffix |