/lib/live/config/0070-tzdata is in live-config 3.0.23-1+deb8u1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57  | #!/bin/sh
## live-config(7) - System Configuration Scripts
## Copyright (C) 2006-2013 Daniel Baumann <daniel@debian.org>
##
## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
## This is free software, and you are welcome to redistribute it
## under certain conditions; see COPYING for details.
Tzdata ()
{
	# Checking if package is installed or already configured
	if [ ! -e /var/lib/dpkg/info/tzdata.list ] || \
	   [ -e /var/lib/live/config/tzdata ]
	then
		return
	fi
	echo -n " tzdata"
	# Reading kernel command line
	for _PARAMETER in ${_CMDLINE}
	do
		case "${_PARAMETER}" in
			live-config.timezone=*|timezone=*)
				LIVE_TIMEZONE="${_PARAMETER#*timezone=}"
				;;
		esac
	done
	Configure_tzdata
}
Configure_tzdata ()
{
	if [ -n "${LIVE_TIMEZONE}" ]
	then
		_AREA="$(echo ${LIVE_TIMEZONE} | cut -f1 -d '/')"
		_ZONE="$(echo ${LIVE_TIMEZONE} | cut -f2 -d '/')"
	else
		_AREA="Etc"
		_ZONE="UTC"
	fi
debconf-communicate -fnoninteractive live-config > /dev/null << EOF
set tzdata/Areas ${_AREA}
set tzdata/Zones/${_AREA} ${_ZONE}
EOF
	cp -f /usr/share/zoneinfo/${_AREA}/${_ZONE} /etc/localtime
	# Creating state file
	touch /var/lib/live/config/tzdata
}
Tzdata
 |