diff --git a/man/tio.1.in b/man/tio.1.in
index 114a97d..631b938 100644
--- a/man/tio.1.in
+++ b/man/tio.1.in
@@ -148,6 +148,8 @@ Set timestamp format to any of the following timestamp formats:
 24-hour format relative to previous timestamp
 .IP "\fBiso8601"
 ISO8601 format ("YYYY-MM-DDThh:mm:ss.sss")
+.IP "\fBepoch"
+Seconds since Unix epoch (1970-01-01)
 .PP
 Default format is \fB24hour\fR
 .RE
diff --git a/man/tio.1.txt b/man/tio.1.txt
index d0096bb..99a6e27 100644
--- a/man/tio.1.txt
+++ b/man/tio.1.txt
@@ -114,6 +114,8 @@ OPTIONS
 
               iso8601         ISO8601 format ("YYYY-MM-DDThh:mm:ss.sss")
 
+              epoch           Seconds since Unix epoch (1970-01-01)
+
               Default format is 24hour
 
            --timestamp-timeout <ms>
diff --git a/src/options.c b/src/options.c
index 22a3969..19f8c8a 100644
--- a/src/options.c
+++ b/src/options.c
@@ -392,6 +392,10 @@ const char* option_timestamp_format_to_string(timestamp_t timestamp)
             return "iso8601";
             break;
 
+        case TIMESTAMP_EPOCH:
+            return "epoch";
+            break;
+
         default:
             return "unknown";
             break;
@@ -418,6 +422,10 @@ void option_parse_timestamp(const char *arg, timestamp_t *timestamp)
     {
         *timestamp = TIMESTAMP_ISO8601;
     }
+    else if (strcmp(arg, "epoch") == 0)
+    {
+        *timestamp = TIMESTAMP_EPOCH;
+    }
     else
     {
         tio_error_print("Invalid timestamp '%s'", arg);
@@ -1151,7 +1159,7 @@ void options_parse_final(int argc, char *argv[])
     if ( ((strncmp("COM", option.target, 3) == 0)
         || (strncmp("com", option.target, 3) == 0) )
         && (sscanf(option.target + 3, "%hhu", &portnum) == 1)
-        && (portnum > 0) ) 
+        && (portnum > 0) )
     {
         asprintf(&tty_win, "/dev/ttyS%hhu", portnum - 1);
         option.target = tty_win;
diff --git a/src/timestamp.c b/src/timestamp.c
index a8d165c..6a23dc3 100644
--- a/src/timestamp.c
+++ b/src/timestamp.c
@@ -76,6 +76,12 @@ char *timestamp_current_time(void)
             tm = localtime(&tv.tv_sec);
             len = strftime(time_string, sizeof(time_string), "%Y-%m-%dT%H:%M:%S", tm);
             break;
+        case TIMESTAMP_EPOCH:
+            // "1223" (seconds since Unix epoch, 1970-01-01 00:00:00Z)
+            tv = tv_now;
+            tm = localtime(&tv.tv_sec);
+            len = strftime(time_string, sizeof(time_string), "%s", tm);
+            break;
         default:
             return NULL;
     }
diff --git a/src/timestamp.h b/src/timestamp.h
index 32d129d..48e0a76 100644
--- a/src/timestamp.h
+++ b/src/timestamp.h
@@ -28,6 +28,7 @@ typedef enum
     TIMESTAMP_24HOUR_START,
     TIMESTAMP_24HOUR_DELTA,
     TIMESTAMP_ISO8601,
+    TIMESTAMP_EPOCH,
     TIMESTAMP_END,
 } timestamp_t;
 
diff --git a/src/tty.c b/src/tty.c
index 6b92080..7dbd286 100644
--- a/src/tty.c
+++ b/src/tty.c
@@ -1079,6 +1079,9 @@ void handle_command_sequence(char input_char, char *output_char, bool *forward)
                     case TIMESTAMP_ISO8601:
                         tio_printf("Switched timestamp mode to iso8601");
                         break;
+                    case TIMESTAMP_EPOCH:
+                        tio_printf("Switched timestamp mode to epoch");
+                        break;
                     case TIMESTAMP_END:
                         option.timestamp = TIMESTAMP_NONE;
                         tio_printf("Switched timestamp mode off");