#! /usr/bin/env bash
#
# Replace anything which looks like timestamps with XXXs (including the #start/end markers in logs).

sed 's/[0-9]\{10\}\.[0-9]\{2,8\}/XXXXXXXXXX.XXXXXX/g' | \
sed 's/^#\(start\|end\).\(19\|20\)..-..-..-..-..-..$/#\1 XXXX-XX-XX-XX-XX-XX/g'