src/loslib.js: Fix off-by-one error in month field of os.time()

2 files changed, 22 insertions, 1 deletions

diff --git a/src/loslib.js b/src/loslib.js
index c282175..d20873d 100644
--- a/src/loslib.js
+++ b/src/loslib.js
@@ -73,7 +73,7 @@ const setallfields = function(L, time, utc) {
     setfield(L, "min",   !utc ? time.getMinutes()  : time.getUTCMinutes());
     setfield(L, "hour",  !utc ? time.getHours()    : time.getUTCHours());
     setfield(L, "day",   !utc ? time.getDate()     : time.getUTCDate());
-    setfield(L, "month", !utc ? time.getMonth()    : time.getUTCMonth());
+    setfield(L, "month", (!utc ? time.getMonth()   : time.getUTCMonth()) + 1);
     setfield(L, "year",  !utc ? time.getFullYear() : time.getUTCFullYear());
     setfield(L, "wday",  !utc ? time.getDay()      : time.getUTCDay());
     let now = new Date();
diff --git a/test/loslib.test.js b/test/loslib.test.js
index 5f06a06..abb5ef2 100644
--- a/test/loslib.test.js
+++ b/test/loslib.test.js
@@ -105,6 +105,27 @@ test('os.date normalisation', () => {
 });
 
 
+test('os.time normalisation of table', () => {
+    let L = lauxlib.luaL_newstate();
+    if (!L) throw Error("failed to create lua state");
+
+    let luaCode = `
+        local t = {
+            day = 20,
+            month = 2,
+            year = 2018
+        }
+        os.time(t)
+        assert(t.day == 20, "unmodified day")
+        assert(t.month == 2, "unmodified month")
+        assert(t.year == 2018, "unmodified year")
+    `;
+    lualib.luaL_openlibs(L);
+    expect(lauxlib.luaL_loadstring(L, to_luastring(luaCode))).toBe(lua.LUA_OK);
+    lua.lua_call(L, 0, 0);
+});
+
+
 test('os.getenv', () => {
     let L = lauxlib.luaL_newstate();
     if (!L) throw Error("failed to create lua state");