Finally
.TP
.B %s
-The number of seconds since the Epoch,
-that is, since 1970-01-01 00:00:00 UTC.
+The number of seconds since the Epoch, 1970-01-01 00:00:00 +0000 (UTC).
Leap seconds are not counted unless leap second support is available.
.LP
The glibc implementation does not require whitespace between