This file is indexed.

/etc/nagios3/conf.d/timeperiods_nagios2.cfg is in nagios3-common 3.5.1.dfsg-2.1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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###############################################################################
# timeperiods.cfg
###############################################################################

# This defines a timeperiod where all times are valid for checks, 
# notifications, etc.  The classic "24x7" support nightmare. :-)

define timeperiod{
        timeperiod_name 24x7
        alias           24 Hours A Day, 7 Days A Week
        sunday          00:00-24:00
        monday          00:00-24:00
        tuesday         00:00-24:00
        wednesday       00:00-24:00
        thursday        00:00-24:00
        friday          00:00-24:00
        saturday        00:00-24:00
        }

# Here is a slightly friendlier period during work hours
define timeperiod{
        timeperiod_name workhours
        alias           Standard Work Hours
        monday          09:00-17:00
        tuesday         09:00-17:00
        wednesday       09:00-17:00
        thursday        09:00-17:00
        friday          09:00-17:00
        }

# The complement of workhours
define timeperiod{
        timeperiod_name nonworkhours
        alias           Non-Work Hours
        sunday          00:00-24:00
        monday          00:00-09:00,17:00-24:00
        tuesday         00:00-09:00,17:00-24:00
        wednesday       00:00-09:00,17:00-24:00
        thursday        00:00-09:00,17:00-24:00
        friday          00:00-09:00,17:00-24:00
        saturday        00:00-24:00
        }

# This one is a favorite: never :)
define timeperiod{
        timeperiod_name never
        alias           Never
        }

# end of file