# Using events

When the window is opened, it will try to set the date range and find a list of dates from one of the layers as follows:

if a layer with dates is selected, that layer will be used;

if a commentary table is found, that will be used;

otherwise one of the layers will be used.

A more comprehensive list of dates may be obtained by clicking the Get date range & list button which will open the window shown. Select the layers from which to obtain the dates and click the OK button.

The start and end dates from the selected layers/tables will be collected, sorted and a list of unique dates obtained.

Once a list has been obtained, the buttons to use the events will be enabled.

The Go to next event button will increment the date to the next event after the current date.

The Go to previous event button will increment the date to the previous event before the current date.

Note that the event is found by working from the current date not from the previous event date used. Thus, the date may be changed using, say, the slider, and the next or previous events will be taken from that date. As the date changes the label shows the number of the event which is on or before the current date and the total number of events.

The date range will be set from the earliest and latest dates found.

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