/etc/freeradius/3.0/mods-available/date is in freeradius-config 3.0.12+dfsg-5+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #
# Registers xlat to convert between time formats.
#
# xlat input string is an attribute name. If this attribute is of date
# or integer type, the date xlat will convert it to a time string in
# the format of the format config item.
#
# If the attribute is a string type, date will attempt to parse it in
# the format specified by the format config item, and will expand
# to a Unix timestamp.
#
date {
format = "%b %e %Y %H:%M:%S %Z"
}
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