diff --git a/src/pixiewps.c b/src/pixiewps.c
index f733f36..feb57c0 100644
--- a/src/pixiewps.c
+++ b/src/pixiewps.c
@@ -79,6 +79,8 @@ static const struct option long_options[] = {
 	{ "mode",      required_argument, 0,  1  },
 	{ "start",     required_argument, 0,  2  },
 	{ "end",       required_argument, 0,  3  },
+	{ "cstart",    required_argument, 0,  4  },
+	{ "cend",      required_argument, 0,  5  },
 	{ "m5-enc",    required_argument, 0, '5' },
 	{ "m7-enc",    required_argument, 0, '7' },
 	{  0,          no_argument,       0, 'h' },
@@ -659,6 +661,18 @@ memory_err:
 					break;
 				}
 				goto usage_err;
+			case  4 :
+				if (!strcmp("cstart", long_options[long_index].name)) {
+					start_p = strtol(optarg, 0, 10);
+					break;
+				}
+				goto usage_err;
+			case  5 :
+				if (!strcmp("cend", long_options[long_index].name)) {
+					end_p = strtol(optarg, 0, 10);
+					break;
+				}
+				goto usage_err;
 			case '5':
 				wps->m5_encr = malloc(ENC_SETTINGS_LEN);
 				if (!wps->m5_encr)
diff --git a/src/pixiewps.h b/src/pixiewps.h
index 2ff110b..2735051 100644
--- a/src/pixiewps.h
+++ b/src/pixiewps.h
@@ -164,6 +164,8 @@ char usage[] =
 	"   --mode N[,... N]  : Mode selection, comma separated           [Auto]\n"
 	"   --start [mm/]yyyy : Starting date             (only mode 3) [+1 day]\n"
 	"   --end   [mm/]yyyy : Ending date               (only mode 3) [-1 day]\n"
+	"   --cstart N        : Starting date (time_t)    (only mode 3)\n"
+	"   --cend   N        : Ending date   (time_t)    (only mode 3)\n"
 	"   -f, --force       : Bruteforce full range     (only mode 3)\n"
 	"\n"
 	" Miscellaneous arguments:\n"