To select the time period you require just click on one of the two radio boxes
to get the option that you want. The actual date entry [except all] is achieved
with the use of drop-down lists. The default is all earthquakes from
1900 onwards. The between option is used if you want all those
earthquakes that occurred between two specific time periods,
e.g. between 01-Feb-54 and 24-Mar-76.