git-retimestamp: fix quote-in-quote syntax to pass for KSH

Signed-off-by: Jim Klimov <[email protected]>

Author: jimklimov

git-retimestamp

@@ -45,8 +45,8 @@ while [ "$PREV" -le "$BACK" ] ; do
 	while sleep 0.1 ; do
 		echo "===== START COMMIT PARSE:"
 		DOLD="`git show -s --format='%ci'`"
-		DNEW="`$GDATE -d "$DOLD $OFFSET"`" && [ -n "$DNEW" ] \
-		|| { DNEW="`$GDATE -f '%Y-%m-%d %H:%M:%S %z' $OFFSET -j "$DOLD"`" && [ -n "$DNEW" ] ; } \
+		DNEW="`$GDATE -d \"$DOLD $OFFSET\"`" && [ -n "$DNEW" ] \
+		|| { DNEW="`$GDATE -f '%Y-%m-%d %H:%M:%S %z' $OFFSET -j \"$DOLD\"`" && [ -n "$DNEW" ] ; } \
 		|| { echo "FATAL: No compatible 'date' program was found for the OFFSET value (and other args) used" >&2 ; git rebase --abort; exit 1 ; }
 
 		echo "=== AMENDING:"