doc/protocol.rst: clarify the term "UNIX time"

Closes https://github.com/MusicPlayerDaemon/MPD/issues/893

doc/protocol.rst: clarify the term "UNIX time"
e92129f4 · Max Kellermann · 374cc51f · e92129f4
Commit e92129f4 authored Jun 10, 2020 by Max Kellermann
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protocol.rst doc/protocol.rst +2 -1

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--- a/doc/protocol.rst
+++ b/doc/protocol.rst
@@ -464,7 +464,8 @@ Querying :program:`MPD`'s status
    - ``songs``: number of songs
    - ``uptime``: daemon uptime in seconds
    - ``db_playtime``: sum of all song times in the database in seconds
-    - ``db_update``: last db update in UNIX time
+    - ``db_update``: last db update in UNIX time (seconds since
+      1970-01-01 UTC)
    - ``playtime``: time length of music played

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