19.2 Time Intervals
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## 19.2 Time Intervals

Time intervals in Kerio MailServer restrict all scheduled tasks to certain time ranges. They are not intervals in the true meaning of the word. They are a group containing any number of single or repeating time ranges. Time intervals can be defined in the Configuration → Definitions → Time Ranges section.

Figure 19.3. Time Intervals

### Validity of Time Intervals

When defining a time interval three types of time ranges (subintervals) can be used:

Absolute

  — interval has explicit start and end dates, it does not repeat

Weekly

  — interval repeats every week (on selected days)

Daily

  — interval repeats every day (in selected hours)

If a certain time interval consists of multiple ranges of different types, it is valid in the time defined by the intersection of absolute ranges with the union of daily and weekly ranges. In symbols:

`(d1 | d2 | w1 | w2) & (a1 | a2)`

where

`d1`, `d2` — daily ranges

`w1`, `w2` — weekly ranges

`a1`, `a2` — absolute ranges

### Defining Time Intervals

You can create, edit or delete time intervals in the Configuration → Definitions → Time Ranges section.

Clicking on the Add button will display the following dialog window:

Figure 19.4. Defining Time Interval

Name

  Name (identification) of the time interval. You can enter a new name (create a new interval) or select an existing one and add a new item to it.

Description

  A text description (for informative purposes only).

Time Interval Type

  The type of interval: Daily, Weekly or Absolute.

From, To

  The beginning and the end of the time range. Here you can enter the start and end time, a day of the week or a date (depending on the interval type).

Valid at days

  The day of the week on which the interval will be valid. You can select certain days (Selected days) or use one of the pre-set items (Everyday, Weekday, Weekend).

Time intervals cannot be cascaded.

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