feat(khal): add todoman, standardize datetime formats

configs/khal.nix

@@ -6,7 +6,7 @@ let
   password = lib.fileContents <secrets/nextcloud/password>;
 in
 {
-  environment.systemPackages = [ pkgs.khal pkgs.vdirsyncer pkgs.khard ];
+  environment.systemPackages = [ pkgs.khal pkgs.vdirsyncer pkgs.khard pkgs.todoman ];
 
   systemd.user.services.vdirsyncer = {
     enable = true;
@@ -48,6 +48,16 @@ in
         skip_unparsable = no
       '';
 
+      "todoman/todoman.conf".text = ''
+        [main]
+        path = ${davHome}/calendar/*
+        date_format = %F
+        time_format = %R
+        default_due = 0
+        default_list = Personal
+        startable = True
+      '';
+
       "khal/config".text = ''
         [calendars]
 
@@ -60,11 +70,11 @@ in
         timedelta = 5d
 
         [locale]
-        timeformat = %H:%M
-        dateformat = %Y-%m-%d
-        longdateformat = %Y-%m-%d
-        datetimeformat = %Y-%m-%d %H:%M
-        longdatetimeformat = %Y-%m-%d %H:%M
+        timeformat = %R
+        dateformat = %F
+        longdateformat = %F
+        datetimeformat = %F %R
+        longdatetimeformat = %F %R
         local_timezone = ${config.time.timeZone}
         default_timezone = ${config.time.timeZone}
         weeknumbers = left