Issue 1157

Users can enter dates in the time filters that occur before and after the extent of the collection. 
The map layer is unaffected when dates are selected which are not available. 
Step 3 will include the dates the users enters. 
The datefields accepts 'Y/m/d|Y|Y/m|d-m-Y" and converts into Y/m/d if necessary.

It is still to be determined what errors may occur on download
Bit of extra space left here