diff --git a/config b/config
index 4f046aa..3f36567 100755
--- a/config
+++ b/config
@@ -7,8 +7,8 @@ fi
 
 ngx_addon_name=ngx_http_set_misc_module
 HTTP_AUX_FILTER_MODULES="$HTTP_AUX_FILTER_MODULES ngx_http_set_misc_module"
-NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/src/ngx_http_set_base32.c $ngx_addon_dir/src/ngx_http_set_default_value.c $ngx_addon_dir/src/ngx_http_set_hashed_upstream.c $ngx_addon_dir/src/ngx_http_set_quote_sql.c $ngx_addon_dir/src/ngx_http_set_quote_json.c $ngx_addon_dir/src/ngx_http_set_unescape_uri.c $ngx_addon_dir/src/ngx_http_set_misc_module.c $ngx_addon_dir/src/ngx_http_set_escape_uri.c $ngx_addon_dir/src/ngx_http_set_hash.c $ngx_addon_dir/src/ngx_http_set_local_today.c $ngx_addon_dir/src/ngx_http_set_hex.c $ngx_addon_dir/src/ngx_http_set_base64.c $ngx_addon_dir/src/ngx_http_set_random.c $ngx_addon_dir/src/ngx_http_set_secure_random.c $ngx_addon_dir/src/ngx_http_set_rotate.c"
-NGX_ADDON_DEPS="$NGX_ADDON_DEPS $ngx_addon_dir/src/ddebug.h $ngx_addon_dir/src/ngx_http_set_default_value.h $ngx_addon_dir/src/ngx_http_set_hashed_upstream.h $ngx_addon_dir/src/ngx_http_set_quote_sql.h $ngx_addon_dir/src/ngx_http_set_quote_json.h $ngx_addon_dir/src/ngx_http_set_unescape_uri.h $ngx_addon_dir/src/ngx_http_set_escape_uri.h $ngx_addon_dir/src/ngx_http_set_hash.h $ngx_addon_dir/src/ngx_http_set_local_today.h $ngx_addon_dir/src/ngx_http_set_hex.h $ngx_addon_dir/src/ngx_http_set_base64.h $ngx_addon_dir/src/ngx_http_set_random.h $ngx_addon_dir/src/ngx_http_set_rotate.h $ngx_addon_dir/src/ngx_http_set_secure_random.h $ngx_addon_dir/src/ngx_http_set_misc_module.h"
+NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/src/ngx_http_set_base32.c $ngx_addon_dir/src/ngx_http_set_default_value.c $ngx_addon_dir/src/ngx_http_set_hashed_upstream.c $ngx_addon_dir/src/ngx_http_set_quote_sql.c $ngx_addon_dir/src/ngx_http_set_quote_json.c $ngx_addon_dir/src/ngx_http_set_unescape_uri.c $ngx_addon_dir/src/ngx_http_set_misc_module.c $ngx_addon_dir/src/ngx_http_set_escape_uri.c $ngx_addon_dir/src/ngx_http_set_expired.c $ngx_addon_dir/src/ngx_http_set_hash.c $ngx_addon_dir/src/ngx_http_set_local_today.c $ngx_addon_dir/src/ngx_http_set_hex.c $ngx_addon_dir/src/ngx_http_set_base64.c $ngx_addon_dir/src/ngx_http_set_random.c $ngx_addon_dir/src/ngx_http_set_secure_random.c $ngx_addon_dir/src/ngx_http_set_rotate.c"
+NGX_ADDON_DEPS="$NGX_ADDON_DEPS $ngx_addon_dir/src/ddebug.h $ngx_addon_dir/src/ngx_http_set_default_value.h $ngx_addon_dir/src/ngx_http_set_hashed_upstream.h $ngx_addon_dir/src/ngx_http_set_quote_sql.h $ngx_addon_dir/src/ngx_http_set_quote_json.h $ngx_addon_dir/src/ngx_http_set_unescape_uri.h $ngx_addon_dir/src/ngx_http_set_escape_uri.h $ngx_addon_dir/src/ngx_http_set_expired.h $ngx_addon_dir/src/ngx_http_set_hash.h $ngx_addon_dir/src/ngx_http_set_local_today.h $ngx_addon_dir/src/ngx_http_set_hex.h $ngx_addon_dir/src/ngx_http_set_base64.h $ngx_addon_dir/src/ngx_http_set_random.h $ngx_addon_dir/src/ngx_http_set_rotate.h $ngx_addon_dir/src/ngx_http_set_secure_random.h $ngx_addon_dir/src/ngx_http_set_misc_module.h"
 
 if [ $USE_OPENSSL = YES ]; then
     NGX_ADDON_DEPS="$NGX_ADDON_DEPS $ngx_addon_dir/src/ngx_http_set_hmac.h"
diff --git a/doc/HttpSetMiscModule.wiki b/doc/HttpSetMiscModule.wiki
index 59a5f76..7031b2b 100644
--- a/doc/HttpSetMiscModule.wiki
+++ b/doc/HttpSetMiscModule.wiki
@@ -862,6 +862,20 @@ And accessing <code>/rotate</code> will also output integer sequence 0, 1, 2, 3,
 
 This directive was first introduced in the <code>v0.22rc7</code> release.
 
+== set_expired ==
+'''syntax:''' ''set_expired $dst <timestamp>''
+
+'''default:''' ''no''
+
+'''context:''' ''location, location if''
+
+'''phase:''' ''rewrite''
+
+Sets <code>$dst</code> to either <code>1</code> or <code>0</code>, dependent on whether or not the
+timestamp as defined in <code>timestamp</code> (seconds since 1970-01-01 00:00:00) is or is not in the past.
+
+Behind the scene, this directive utilizes the <code>ngx_time</code> API in the Nginx core, so usually no syscall is involved due to the time caching mechanism in the Nginx core.
+
 == set_local_today ==
 '''syntax:''' ''set_local_today $dst''
 
diff --git a/src/ngx_http_set_expired.c b/src/ngx_http_set_expired.c
new file mode 100644
index 0000000..17db8a9
--- /dev/null
+++ b/src/ngx_http_set_expired.c
@@ -0,0 +1,32 @@
+#ifndef DDEBUG
+#define DDEBUG 0
+#endif
+#include "ddebug.h"
+
+#include <ndk.h>
+
+#include "ngx_http_set_expired.h"
+
+ngx_int_t
+ngx_http_set_misc_set_expired(ngx_http_request_t *r, ngx_str_t *res,
+    ngx_http_variable_value_t *v)
+{
+    ngx_http_variable_value_t *expires;
+    time_t                    now, deadline;
+
+    expires = v;
+    dd("expires=%.*s",(int) expires->len, expires->data);
+
+    now = ngx_time();
+    deadline = ngx_atotm(expires->data, expires->len);
+    dd("now=%lld, deadline=%lld", (long long) now, (long long) deadline);
+
+    res->len = 1;
+    res->data = ngx_palloc(r->pool, res->len);
+    if (res->data == NULL) {
+        return NGX_ERROR;
+    }
+    res->data[0] = (u_char) ((deadline && now < deadline) ? '0' : '1');
+
+    return NGX_OK;
+ }
diff --git a/src/ngx_http_set_expired.h b/src/ngx_http_set_expired.h
new file mode 100644
index 0000000..d6d67ca
--- /dev/null
+++ b/src/ngx_http_set_expired.h
@@ -0,0 +1,11 @@
+#ifndef NGX_HTTP_SET_EXPIRED
+#define NGX_HTTP_SET_EXPIRED
+
+#include <ngx_core.h>
+#include <ngx_config.h>
+#include <ngx_http.h>
+
+ngx_int_t ngx_http_set_misc_set_expired(ngx_http_request_t *r,
+        ngx_str_t *res, ngx_http_variable_value_t *v);
+
+#endif /* NGX_HTTP_SET_EXPIRED */
diff --git a/src/ngx_http_set_misc_module.c b/src/ngx_http_set_misc_module.c
index c57aac7..8ec9ced 100755
--- a/src/ngx_http_set_misc_module.c
+++ b/src/ngx_http_set_misc_module.c
@@ -12,6 +12,7 @@
 #include "ngx_http_set_quote_sql.h"
 #include "ngx_http_set_quote_json.h"
 #include "ngx_http_set_escape_uri.h"
+#include "ngx_http_set_expired.h"
 #include "ngx_http_set_local_today.h"
 #include "ngx_http_set_hash.h"
 #include "ngx_http_set_hex.h"
@@ -108,6 +109,12 @@ static ndk_set_var_t ngx_http_set_misc_escape_uri_filter = {
     NULL
 };
 
+static ndk_set_var_t ngx_http_set_misc_set_expired_filter = {
+    NDK_SET_VAR_VALUE,
+    (void *) ngx_http_set_misc_set_expired,
+    1,
+    NULL
+};
 
 static ndk_set_var_t  ngx_http_set_misc_decode_base32_filter = {
     NDK_SET_VAR_VALUE,
@@ -279,6 +286,15 @@ static ngx_command_t  ngx_http_set_misc_commands[] = {
         0,
         &ngx_http_set_misc_escape_uri_filter
     },
+    {
+        ngx_string ("set_expired"),
+        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF
+            |NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE12,
+        ndk_set_var_value,
+        0,
+        0,
+        &ngx_http_set_misc_set_expired_filter
+    },
     {
         ngx_string ("set_quote_sql_str"),
         NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_SIF_CONF
diff --git a/t/expired.t b/t/expired.t
new file mode 100644
index 0000000..585bf2c
--- /dev/null
+++ b/t/expired.t
@@ -0,0 +1,67 @@
+# vi:filetype=
+
+use lib 'lib';
+use Test::Nginx::Socket;
+
+#repeat_each(3);
+
+plan tests => repeat_each() * 2 * blocks();
+
+no_long_string();
+
+run_tests();
+
+#no_diff();
+
+__DATA__
+
+=== TEST 1: expired for 1970-01-01 00:00:00
+--- config
+    location /bar {
+        set_expired $expired 0;
+        echo $expired;
+    }
+--- request
+    GET /bar
+--- response_body
+1
+
+
+
+=== TEST 2: expired for 1970-01-01 00:00:01
+--- config
+    location /bar {
+        set_expired $expired 1;
+        echo $expired;
+    }
+--- request
+    GET /bar
+--- response_body
+1
+
+
+
+=== TEST 3: expired for 2020-01-01 00:00:00
+--- config
+    location /bar {
+        set_expired $expired 1577836800;
+        echo $expired;
+    }
+--- request
+    GET /bar
+--- response_body
+0
+
+
+
+=== TEST 4: expired for 9999-01-01 00:00:00
+--- config
+    location /bar {
+        set_expired $expired 253370764800;
+        echo $expired;
+    }
+--- request
+    GET /bar
+--- response_body
+0
+