On Tue, 24 Jul 2018 16:40:48 +0100, Ralph Corderoy said:
How about
+fmt='%Y-%m-%d %T %z'
+now=${SOURCE_DATE_EPOCH-$(date +%s)}
+if date -u -d @42 +"$fmt" >/dev/null 2>&1; then # Coreutils.
+ date=$(date -u -d "@$now" +"$fmt")
+elif date -u -r 42 +"$fmt" >/dev/null 2>&1; then # BSD.
+ date=$(date -u -r "$now" +"$fmt")
+else # Posix, ignoring SOURCE_DATE_EPOCH.
+ date=$(date -u +"$fmt")
+fi
Oh, much better than that date || date || date monstrosity - I was unable to figure out that the second one was intended for a different date binary than the first one
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