Calendar is an object with definitions of day types for every day in a year. The calendars are used to define time channels, but they can also be used as independent objects (e.g. in expressions of eval tags). The value of the object of Calendar type is a value of the current day type:

• 1 - workday,
• 2 - Saturday,
• 3 - Sunday,
• 4 - the object of Day type created by the system configurator as the first,
• 5 - the object of Day type created by the system configurator as the second, etc.