Merge PR uxsolutions#1984 'Doc: format for endDate and startDate' into 1.6. Closed uxsolutions#1984

Author: acrobat

docs/options.rst

@@ -198,10 +198,12 @@ If false the datepicker will not show on a readonly datepicker field.
 endDate
 -------
 
-Date.  Default: End of time
+Date or String.  Default: End of time
 
 The latest date that may be selected; all later dates will be disabled.
 
+Date should be in local timezone. String must be parsable with ``format``.
+
 .. figure:: _static/screenshots/option_enddate.png
     :align: center
 
@@ -387,10 +389,12 @@ If false, the datepicker will be prevented from showing when the input field ass
 startDate
 ---------
 
-Date.  Default: Beginning of time
+Date or String.  Default: Beginning of time
 
 The earliest date that may be selected; all earlier dates will be disabled.
 
+Date should be in local timezone. String must be parsable with ``format``.
+
 .. figure:: _static/screenshots/option_startdate.png
     :align: center