TW-1807: dateformat lacks a flag to display day of week

- Thanks to Ellington Santos.

AUTHORS

@@ -292,3 +292,4 @@ suggestions:
   Yaroslav Molochko
   Michael Meier
   Slaven ʙanovic
+  Ellington Santos

ChangeLog

@@ -16,6 +16,8 @@
           (thanks to Renato Alves).
 - TW-1806 project:ide is not allowed
           (thanks to Slaven ʙanovic).
+- TW-1807 dateformat lacks a flag to display day of week
+          (thanks to Ellington Santos).
 - Added 'juhannus' as a synonym for 'midsommarafton'
           (thanks to Lynoure Braakman).
 - Deprecated the 'DUETODAY' virtual tag, which is a synonym for the 'TODAY'

doc/man/taskrc.5.in

@@ -583,6 +583,8 @@ S  two-digit seconds,      for example 07 or 47
 J  three-digit Julian day, for example 023 or 365
 .br
 j  Julian day,             for example 23 or 365
+.br
+w  Week day,               for example 0 for Monday, 5 for Friday
 .RE
 .RE
 

src/ISO8601.cpp

@@ -1122,6 +1122,7 @@ const std::string ISO8601d::toString (
     case 'S': formatted << std::setw (2) << std::setfill ('0') << this->second ();        break;
     case 'j': formatted                                        << this->dayOfYear ();     break;
     case 'J': formatted << std::setw (3) << std::setfill ('0') << this->dayOfYear ();     break;
+    case 'w': formatted                                        << this->dayOfWeek ();     break;
     default:  formatted                                        << static_cast <char> (c); break;
     }
   }