Any player logging in outside of opening hours gets a clear message stating the opening hours and is denied access.
Players logged in at closing time get a warning that the server will close down beforehand and are disconnected from the server at closing time with a message explaining this.

The opening hours are specified in the configuration file.
All messages can be set and localized in the configuration file.

Server Closed Message

Installation

As usual: put the OpeningHours.jar in the plugins directory.

Command

/openinghours displays opening hours per weekday.

Permissions

permission 'openinghours.ignore' allows a user to login outside (and inside) of opening hours.
permission 'openinghours.openinghours' allows a user execute the /openinghours command to display opening hours per weekday.

Configuration

The plugin is configured via the file plugins/OpeningHours/config.yml. The first time the plugin runs it creates an example configuration file.

Example config.yml:

#Times are specified between quotes in 24 or 12 hours format.
#Spaces are ignored in times, so spaces can be added for aesthetics when used in the messages below.
#e.g. '06:00', '06:00 AM', '06:00AM', '14:00', '02:00 PM', '02:00PM'
serverOpeningTime: '09:00'
serverClosingTime: '19:00'

#override the opening times above for the days & times mentioned below (all weekdays -lower-case- are recognized):

friday:: serverClosingTime: '23:00'
saturday:: serverOpeningTime: '01:00'
serverClosingTime: '23:00'
sunday:: serverOpeningTime: '01:00'

#Show messages:warnBeforeClose this many seconds before serverClosingTime:
warnSecondsBeforeClose: 60

#specify (comma separated) the players who should be able to login outside of opening hours
#note that permission "openinghours.ignore" does the same
ignoreFor: tarzan, jane, douglas

#messages can use parameters %serverOpeningTime%, %serverClosingTime%,
#%warnSecondsBeforeClose% and "\n" for a line feed.

messages:: serverClosed: 'This server is currently closed.\n\nOpening hours from %serverOpeningTime% to %serverClosingTime%.'
warnBeforeClose: 'This server closes in %warnSecondsBeforeClose% seconds.'
kickPlayer: 'Everybody is kicked because this server is currently closed.\n\nOpening hours from %serverOpeningTime% to %serverClosingTime%.'
errorOpenNotAfterClose: 'Opening time should be before closing time. Plugin disabled.'

OpeningHours Logo by WishesXD