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I couldn't find one to suit anywhere so wrote this.
It is not really needed during shutdown because all it does is send SIGTERM to all the rsync server processes and the Linux shutdown process does that anyway. rsync server processes are well behaved and do terminate quickly in response to SIGTERM so there's no need to check that the processes have terminated and escalate to SIGKILL (which the Linux shutdown process does anyway).
This technique was developed to generate a timestamp string for rsync's --backup-dir option but it could be generally useful.
The first issue is that the value of %DATE% depends on Windows' regional settings so is not portable. The same goes for the output format of cmd.exe's builtin command date. (one example of many discussions: this StackOverflow thread). There is no way to program around this in a .BAT or .CMD script. The chosen solution was to UnxUtils' date.exe which is a...
EDIT: this works but causes sendmail to pause for ~1 minute when it can't find its own FQDN; this slows boot (if sendmail is started at boot and not backgrounded) and would be un-workable on a busy mail server.
Here's how to configure sendmail to send mails when the computer is configured with a hostname but no domain name. It may be of use, for example, if you want to mail system exception reports and do not want to configure the computer as being part of a...