Merge pull request #65 from monaqa/fix-osdate_in_windows

fix: `%-m` and others does not work on Windows

lua/dial/augend/date.lua

@@ -143,21 +143,37 @@ local date_elements = {
             date.year = 2000 + tonumber(text)
             return date
         end,
+        format = function(time)
+            local year = os.date("*t", time).year --[[ @as integer ]]
+            return tostring(year % 100)
+        end,
     },
     ["-m"] = {
         kind = "month",
         regex = [[\d\{1,2\}]],
         update_date = simple_updater "month",
+        format = function(time)
+            local month = os.date("*t", time).month --[[ @as integer ]]
+            return tostring(month)
+        end,
     },
     ["-d"] = {
         kind = "day",
         regex = [[\d\{1,2\}]],
         update_date = simple_updater "day",
+        format = function(time)
+            local day = os.date("*t", time).day --[[ @as integer ]]
+            return tostring(day)
+        end,
     },
     ["-H"] = {
         kind = "hour",
         regex = [[\d\{1,2\}]],
         update_date = simple_updater "hour",
+        format = function(time)
+            local hour = os.date("*t", time).hour --[[ @as integer ]]
+            return tostring(hour)
+        end,
     },
     ["-I"] = {
         kind = "hour",
@@ -173,16 +189,29 @@ local date_elements = {
             end
             return date
         end,
+        format = function(time)
+            local hour = os.date("*t", time).hour --[[ @as integer ]]
+            -- 0 -> 12, 1 -> 1, 2 -> 2, ..., 12 -> 12, ...,  23 -> 11
+            return tostring((hour + 11) % 12 + 1)
+        end,
     },
     ["-M"] = {
         kind = "min",
         regex = [[\d\{1,2\}]],
         update_date = simple_updater "min",
+        format = function(time)
+            local min = os.date("*t", time).min --[[ @as integer ]]
+            return tostring(min)
+        end,
     },
     ["-S"] = {
         kind = "sec",
         regex = [[\d\{1,2\}]],
         update_date = simple_updater "sec",
+        format = function(time)
+            local sec = os.date("*t", time).sec --[[ @as integer ]]
+            return tostring(sec)
+        end,
     },
 
     -- names
@@ -728,7 +757,7 @@ M.alias["%H:%M:%S"] = M.new {
 
 M.alias["%H:%M"] = M.new {
     pattern = "%H:%M",
-    default_kind = "sec",
+    default_kind = "min",
     only_valid = true,
 }