Calendars

A calendar represents a numeric value that is varying over time.

Calendars can be linked to multiple entities: a maximum capacity limit of a resource, a minimum capacity usage of a resource, a minimum or maximum inventory limit of a buffer, etc…

A calendar has multiple buckets to define the values over time. To determine the calendar value at a certain date the calendar will evaluate each of the buckets and combine the results in the following way:

  • A bucket is only valid from its “start” date (inclusive) till its “end” date (exclusive).
    Outside of this date range a bucket is never selected.
  • If multiple bucket are effective on a date, the one with the lowest “priority” value is taken.
    In case buckets have the same priority, the value of the bucket with the latest start date is selected.
  • In case no bucket is effective on a certain date, the calendar will return the “default” value.

Fields

Field Type Description
name non-empty string Unique name of the calendar. This is the key field and a required attribute.
default double The default value of the calendar when no bucket is effective.

Calendar bucket

Field Type Description
value double The actual time-varying value.
start dateTime
Start date of the validity of this bucket.
When left unspecified, the entry is effective from the infinite past.
Makes up the key together with the end and priority fields.
end dateTime
End date of the validity of this bucket.
When left unspecified, the entry is effective indefinitely in the future.
Makes up the key together with the start and priority fields.
priority integer
Priority of this bucket when multiple buckets are effective for the same date.
Lower values indicate higher priority.
Makes up the key together with the start and end fields.
days integer between 0 and 127
Bit pattern representing the days on which the calendar bucket is valid:
Bit 0 = 1 = Sunday
Bit 1 = 2 = Monday
Bit 2 = 4 = Tuesday
Bit 3 = 8 = Wednesday
Bit 4 = 16 = Thursday
Bit 5 = 32 = Friday
Bit 6 = 64 = Saturday
The default value is 127, ie valid on every day of the week.
starttime duration
Time when this entry becomes effective on valid days in the valid date horizon.
The default value is PT0S, ie midnight.
endtime duration
Time when this entry becomes ineffective on valid days in the valid date horizon.
The default value is PT23H59M59S, ie right before midnight of the next day.