Function init_datetime

lua/ltypes.c:1776–1792

    lua_setfield(L, -2, name)

static void init_datetime(Lua L)
{
    luaL_newmetatable(L, "datetime_helper");
    lua_pushstring(L, "__index");
    lua_pushvalue(L, -2);
    lua_settable(L, 3);
    luaL_openlib(L, NULL, datetime_funcs, 0);
    lua_pop(L, 1);

    luaL_newmetatable(L, dbtypes.datetime);
    setup_method(L, "__index", l_datetime_index);
    setup_method(L, "__tostring", l_datetime_tostring);
    init_arithmetic(L, 0);
    init_cmp(L);
    init_common(L);
    lua_pop(L, 1);
}

static int l_intervalym_years(Lua L)
{