docs: Update meta time example (#2187)

As unix-time is always utc, the 'utc' the example 'time:unix:utc:usec' isn't useful.
merbanan · Sep 24, 2022 · e066b66 · e066b66
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diff --git a/conf/rtl_433.example.conf b/conf/rtl_433.example.conf
@@ -130,14 +130,14 @@ analyze_pulses false
 #   [-M time[:<options>]|protocol|level|noise[:<secs>]|stats|bits] Add various metadata to every output line.
 # Use "time" to add current date and time meta data (preset for live inputs).
 # Use "time:rel" to add sample position meta data (preset for read-file and stdin).
-# Use "time:unix" to show the seconds since unix epoch as time meta data.
+# Use "time:unix" to show the seconds since unix epoch as time meta data. This is always UTC.
 # Use "time:iso" to show the time with ISO-8601 format (YYYY-MM-DD"T"hh:mm:ss).
 # Use "time:off" to remove time meta data.
 # Use "time:usec" to add microseconds to date time meta data.
 # Use "time:tz" to output time with timezone offset.
 # Use "time:utc" to output time in UTC.
 #   (this may also be accomplished by invocation with TZ environment variable set).
-#   "usec" and "utc" can be combined with other options, eg. "time:unix:utc:usec".
+#   "usec" and "utc" can be combined with other options, eg. "time:iso:utc" or "time:unix:usec".
 # Use "protocol" / "noprotocol" to output the decoder protocol number meta data.
 # Use "level" to add Modulation, Frequency, RSSI, SNR, and Noise meta data.
 # Use "noise[:secs]" to report estimated noise level at intervals (default: 10 seconds).

diff --git a/src/rtl_433.c b/src/rtl_433.c
@@ -299,14 +299,14 @@ static void help_meta(void)
             "  [-M time[:<options>]|protocol|level|noise[:<secs>]|stats|bits] Add various metadata to every output line.\n"
             "\tUse \"time\" to add current date and time meta data (preset for live inputs).\n"
             "\tUse \"time:rel\" to add sample position meta data (preset for read-file and stdin).\n"
-            "\tUse \"time:unix\" to show the seconds since unix epoch as time meta data.\n"
+            "\tUse \"time:unix\" to show the seconds since unix epoch as time meta data. This is always UTC.\n"
             "\tUse \"time:iso\" to show the time with ISO-8601 format (YYYY-MM-DD\"T\"hh:mm:ss).\n"
             "\tUse \"time:off\" to remove time meta data.\n"
             "\tUse \"time:usec\" to add microseconds to date time meta data.\n"
             "\tUse \"time:tz\" to output time with timezone offset.\n"
             "\tUse \"time:utc\" to output time in UTC.\n"
             "\t\t(this may also be accomplished by invocation with TZ environment variable set).\n"
-            "\t\t\"usec\" and \"utc\" can be combined with other options, eg. \"time:unix:utc:usec\".\n"
+            "\t\t\"usec\" and \"utc\" can be combined with other options, eg. \"time:iso:utc\" or \"time:unix:usec\".\n"
             "\tUse \"replay[:N]\" to replay file inputs at (N-times) realtime.\n"
             "\tUse \"protocol\" / \"noprotocol\" to output the decoder protocol number meta data.\n"
             "\tUse \"level\" to add Modulation, Frequency, RSSI, SNR, and Noise meta data.\n"