Time interval properties.

There are three types of time intervals: strict, sliding and mixed.

Strict type: this time interval has constant time borders that do not change. For example: The period from January 1, 2007 to December 31, 2007 will always show the entire year 2007.

Sliding type: the start date of this time interval is today, while the end date is defined by the period, i.e. the number of days that should be shown. For example: the interval Next 7 days covers today and 7 more days.

Mixed type: this time interval has period borders and the period it covers is not slides inside it. For example: the interval This week covers today and all days from the beginning of the current week and to the end of it.

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