diff --git a/doc/configuration.txt b/doc/configuration.txt
index 80b9c01..1099695 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -14699,6 +14699,7 @@
   |   | %ST  | status_code                                   | numeric     |
   |   | %T   | gmt_date_time                                 | date        |
   |   | %Tc  | Tc                                            | numeric     |
+  |   | %Td  | Td = Tt - (Tq + Tw + Tc + Tr)                 | numeric     |
   |   | %Tl  | local_date_time                               | date        |
   | H | %Tq  | Tq                                            | numeric     |
   | H | %Tr  | Tr                                            | numeric     |
diff --git a/include/types/log.h b/include/types/log.h
index e974086..25d872e 100644
--- a/include/types/log.h
+++ b/include/types/log.h
@@ -81,6 +81,7 @@
 	LOG_FMT_TW,
 	LOG_FMT_TC,
 	LOG_FMT_TR,
+	LOG_FMT_TD,
 	LOG_FMT_TT,
 	LOG_FMT_STATUS,
 	LOG_FMT_CCLIENT,
diff --git a/src/log.c b/src/log.c
index 2d02247..99c89f3 100644
--- a/src/log.c
+++ b/src/log.c
@@ -127,6 +127,7 @@
 	{ "Tl", LOG_FMT_DATELOCAL, PR_MODE_TCP, LW_INIT, NULL },   /* date local timezone */
 	{ "Tq", LOG_FMT_TQ, PR_MODE_HTTP, LW_BYTES, NULL },       /* Tq */
 	{ "Tr", LOG_FMT_TR, PR_MODE_HTTP, LW_BYTES, NULL },       /* Tr */
+	{ "Td", LOG_FMT_TD, PR_MODE_TCP, LW_BYTES, NULL },       /* Td = Tt - (Tq + Tw + Tc + Tr) */
 	{ "Ts", LOG_FMT_TS, PR_MODE_TCP, LW_INIT, NULL },   /* timestamp GMT */
 	{ "Tt", LOG_FMT_TT, PR_MODE_TCP, LW_BYTES, NULL },       /* Tt */
 	{ "Tw", LOG_FMT_TW, PR_MODE_TCP, LW_BYTES, NULL },       /* Tw */
@@ -1655,6 +1656,19 @@
 				last_isspace = 0;
 				break;
 
+			case LOG_FMT_TD: // %Td
+				if (s->be->mode == PR_MODE_HTTP)
+					ret = ltoa_o((s->logs.t_data >= 0) ? s->logs.t_close - s->logs.t_data : -1,
+					             tmplog, dst + maxsize - tmplog);
+				else
+					ret = ltoa_o((s->logs.t_connect >= 0) ? s->logs.t_close - s->logs.t_connect : -1,
+					             tmplog, dst + maxsize - tmplog);
+				if (ret == NULL)
+					goto out;
+				tmplog = ret;
+				last_isspace = 0;
+				break;
+
 			case LOG_FMT_TT:  // %Tt
 				if (!(fe->to_log & LW_BYTES))
 					LOGCHAR('+');