diff --git a/src/core/ngx_conf_file.c b/src/core/ngx_conf_file.c
index 8326501..6d998a5 100644
--- a/src/core/ngx_conf_file.c
+++ b/src/core/ngx_conf_file.c
@@ -1295,10 +1295,6 @@
         return "invalid value";
     }
 
-    if (*msp == (ngx_msec_t) NGX_PARSE_LARGE_TIME) {
-        return "value must be less than 597 hours";
-    }
-
     if (cmd->post) {
         post = cmd->post;
         return post->post_handler(cf, post, msp);
@@ -1326,14 +1322,10 @@
     value = cf->args->elts;
 
     *sp = ngx_parse_time(&value[1], 1);
-    if (*sp == NGX_ERROR) {
+    if (*sp == (time_t) NGX_ERROR) {
         return "invalid value";
     }
 
-    if (*sp == NGX_PARSE_LARGE_TIME) {
-        return "value must be less than 68 years";
-    }
-
     if (cmd->post) {
         post = cmd->post;
         return post->post_handler(cf, post, sp);
diff --git a/src/core/ngx_parse.h b/src/core/ngx_parse.h
index 0c8114f..ec093b5 100644
--- a/src/core/ngx_parse.h
+++ b/src/core/ngx_parse.h
@@ -13,9 +13,6 @@
 #include <ngx_core.h>
 
 
-#define NGX_PARSE_LARGE_TIME  -2
-
-
 ssize_t ngx_parse_size(ngx_str_t *line);
 off_t ngx_parse_offset(ngx_str_t *line);
 ngx_int_t ngx_parse_time(ngx_str_t *line, ngx_uint_t is_sec);
diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index 6ab0ddb..5a0ade7 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -160,7 +160,7 @@
 
             r->valid = ngx_parse_time(&s, 1);
 
-            if (r->valid == NGX_ERROR) {
+            if (r->valid == (time_t) NGX_ERROR) {
                 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                    "invalid parameter: %V", &names[i]);
                 return NULL;
diff --git a/src/http/modules/ngx_http_headers_filter_module.c b/src/http/modules/ngx_http_headers_filter_module.c
index daa1762..ff33f1f 100644
--- a/src/http/modules/ngx_http_headers_filter_module.c
+++ b/src/http/modules/ngx_http_headers_filter_module.c
@@ -530,7 +530,7 @@
 
     hcf->expires_time = ngx_parse_time(&value[n], 1);
 
-    if (hcf->expires_time == NGX_ERROR) {
+    if (hcf->expires_time == (time_t) NGX_ERROR) {
         return "invalid value";
     }
 
@@ -540,10 +540,6 @@
         return "daily time value must be less than 24 hours";
     }
 
-    if (hcf->expires_time == NGX_PARSE_LARGE_TIME) {
-        return "value must be less than 68 years";
-    }
-
     if (minus) {
         hcf->expires_time = - hcf->expires_time;
     }
diff --git a/src/http/modules/ngx_http_log_module.c b/src/http/modules/ngx_http_log_module.c
index c551317..bfbbe93 100644
--- a/src/http/modules/ngx_http_log_module.c
+++ b/src/http/modules/ngx_http_log_module.c
@@ -1249,7 +1249,7 @@
             s.data = value[i].data + 9;
 
             inactive = ngx_parse_time(&s, 1);
-            if (inactive < 0) {
+            if (inactive == (time_t) NGX_ERROR) {
                 goto failed;
             }
 
@@ -1272,7 +1272,7 @@
             s.data = value[i].data + 6;
 
             valid = ngx_parse_time(&s, 1);
-            if (valid < 0) {
+            if (valid == (time_t) NGX_ERROR) {
                 goto failed;
             }
 
diff --git a/src/http/modules/ngx_http_userid_filter_module.c b/src/http/modules/ngx_http_userid_filter_module.c
index 894e2c1..8713dd6 100644
--- a/src/http/modules/ngx_http_userid_filter_module.c
+++ b/src/http/modules/ngx_http_userid_filter_module.c
@@ -774,14 +774,10 @@
     }
 
     ucf->expires = ngx_parse_time(&value[1], 1);
-    if (ucf->expires == NGX_ERROR) {
+    if (ucf->expires == (time_t) NGX_ERROR) {
         return "invalid value";
     }
 
-    if (ucf->expires == NGX_PARSE_LARGE_TIME) {
-        return "value must be less than 68 years";
-    }
-
     return NGX_CONF_OK;
 }
 
diff --git a/src/http/ngx_http_busy_lock.c b/src/http/ngx_http_busy_lock.c
index 35a03ac..cd8e07c 100644
--- a/src/http/ngx_http_busy_lock.c
+++ b/src/http/ngx_http_busy_lock.c
@@ -274,7 +274,7 @@
             line.data = value[i].data + 2;
 
             bl->timeout = ngx_parse_time(&line, 1);
-            if (bl->timeout == NGX_ERROR) {
+            if (bl->timeout == (time_t) NGX_ERROR) {
                 invalid = 1;
                 break;
             }
diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 0bfc76f..f82897d 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -3853,7 +3853,7 @@
                     s.len = p - s.data;
 
                     lsopt.tcp_keepidle = ngx_parse_time(&s, 1);
-                    if (lsopt.tcp_keepidle == NGX_ERROR) {
+                    if (lsopt.tcp_keepidle == (time_t) NGX_ERROR) {
                         goto invalid_so_keepalive;
                     }
                 }
@@ -3869,7 +3869,7 @@
                     s.len = p - s.data;
 
                     lsopt.tcp_keepintvl = ngx_parse_time(&s, 1);
-                    if (lsopt.tcp_keepintvl == NGX_ERROR) {
+                    if (lsopt.tcp_keepintvl == (time_t) NGX_ERROR) {
                         goto invalid_so_keepalive;
                     }
                 }
@@ -4516,7 +4516,7 @@
             s.data = value[i].data + 9;
 
             inactive = ngx_parse_time(&s, 1);
-            if (inactive < 0) {
+            if (inactive == (time_t) NGX_ERROR) {
                 goto failed;
             }
 
@@ -4603,24 +4603,16 @@
         return "invalid value";
     }
 
-    if (clcf->keepalive_timeout == (ngx_msec_t) NGX_PARSE_LARGE_TIME) {
-        return "value must be less than 597 hours";
-    }
-
     if (cf->args->nelts == 2) {
         return NGX_CONF_OK;
     }
 
     clcf->keepalive_header = ngx_parse_time(&value[2], 1);
 
-    if (clcf->keepalive_header == NGX_ERROR) {
+    if (clcf->keepalive_header == (time_t) NGX_ERROR) {
         return "invalid value";
     }
 
-    if (clcf->keepalive_header == NGX_PARSE_LARGE_TIME) {
-        return "value must be less than 68 years";
-    }
-
     return NGX_CONF_OK;
 }
 
diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
index 4840233..eb1e990 100644
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -1597,7 +1597,8 @@
     time_t                  inactive;
     ssize_t                 size;
     ngx_str_t               s, name, *value;
-    ngx_int_t               loader_files, loader_sleep, loader_threshold;
+    ngx_int_t               loader_files;
+    ngx_msec_t              loader_sleep, loader_threshold;
     ngx_uint_t              i, n;
     ngx_http_file_cache_t  *cache;
 
@@ -1704,7 +1705,7 @@
             s.data = value[i].data + 9;
 
             inactive = ngx_parse_time(&s, 1);
-            if (inactive < 0) {
+            if (inactive == (time_t) NGX_ERROR) {
                 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                    "invalid inactive value \"%V\"", &value[i]);
                 return NGX_CONF_ERROR;
@@ -1746,7 +1747,7 @@
             s.data = value[i].data + 13;
 
             loader_sleep = ngx_parse_time(&s, 0);
-            if (loader_sleep < 0) {
+            if (loader_sleep == (ngx_msec_t) NGX_ERROR) {
                 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                            "invalid loader_sleep value \"%V\"", &value[i]);
                 return NGX_CONF_ERROR;
@@ -1761,7 +1762,7 @@
             s.data = value[i].data + 17;
 
             loader_threshold = ngx_parse_time(&s, 0);
-            if (loader_threshold < 0) {
+            if (loader_threshold == (ngx_msec_t) NGX_ERROR) {
                 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                            "invalid loader_threshold value \"%V\"", &value[i]);
                 return NGX_CONF_ERROR;
@@ -1788,8 +1789,8 @@
     cache->path->conf_file = cf->conf_file->file.name.data;
     cache->path->line = cf->conf_file->line;
     cache->loader_files = loader_files;
-    cache->loader_sleep = (ngx_msec_t) loader_sleep;
-    cache->loader_threshold = (ngx_msec_t) loader_threshold;
+    cache->loader_sleep = loader_sleep;
+    cache->loader_threshold = loader_threshold;
 
     if (ngx_add_path(cf, &cache->path) != NGX_OK) {
         return NGX_CONF_ERROR;
@@ -1843,7 +1844,7 @@
     n = cf->args->nelts - 1;
 
     valid = ngx_parse_time(&value[n], 1);
-    if (valid < 0) {
+    if (valid == (time_t) NGX_ERROR) {
         ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                            "invalid time value \"%V\"", &value[n]);
         return NGX_CONF_ERROR;
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 8581a94..4504d98 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -4268,7 +4268,7 @@
 
             fail_timeout = ngx_parse_time(&s, 1);
 
-            if (fail_timeout == NGX_ERROR) {
+            if (fail_timeout == (time_t) NGX_ERROR) {
                 goto invalid;
             }
 
diff --git a/src/mail/ngx_mail_core_module.c b/src/mail/ngx_mail_core_module.c
index 2fb537a..52a5369 100644
--- a/src/mail/ngx_mail_core_module.c
+++ b/src/mail/ngx_mail_core_module.c
@@ -479,7 +479,7 @@
                     s.len = p - s.data;
 
                     ls->tcp_keepidle = ngx_parse_time(&s, 1);
-                    if (ls->tcp_keepidle == NGX_ERROR) {
+                    if (ls->tcp_keepidle == (time_t) NGX_ERROR) {
                         goto invalid_so_keepalive;
                     }
                 }
@@ -495,7 +495,7 @@
                     s.len = p - s.data;
 
                     ls->tcp_keepintvl = ngx_parse_time(&s, 1);
-                    if (ls->tcp_keepintvl == NGX_ERROR) {
+                    if (ls->tcp_keepintvl == (time_t) NGX_ERROR) {
                         goto invalid_so_keepalive;
                     }
                 }