display date as date when opening ods

src/tablib/formats/_ods.py

@@ -5,7 +5,7 @@
 import numbers
 from io import BytesIO
 
-from odf import opendocument, style, table, text
+from odf import opendocument, style, table, text, number
 
 import tablib
 
@@ -16,6 +16,14 @@
     fontweightcomplex="bold",
 ))
 
+date_style = number.DateStyle(name="date-style1")
+date_style.addElement(number.Year(style="long"))
+date_style.addElement(number.Text(text=u"-"))
+date_style.addElement(number.Month(style="long"))
+date_style.addElement(number.Text(text=u"-"))
+date_style.addElement(number.Day(style="long"))
+ds = style.Style(name="ds1", datastylename="date-style1", parentstylename="Default", family="table-cell")
+
 
 class ODSFormat:
     title = 'ods'
@@ -27,6 +35,8 @@ def export_set(cls, dataset):
 
         wb = opendocument.OpenDocumentSpreadsheet()
         wb.automaticstyles.addElement(bold)
+        wb.styles.addElement(date_style)
+        wb.automaticstyles.addElement(ds)
 
         ws = table.Table(name=dataset.title if dataset.title else 'Tablib Dataset')
         wb.spreadsheet.addElement(ws)
@@ -161,7 +171,9 @@ def dset_sheet(cls, dataset, ws):
                         valuetype="date", value=col.strftime('%Y-%m-%dT%H:%M:%S')
                     )
                 elif isinstance(col, dt.date):
-                    cell = table.TableCell(valuetype="date", datevalue=col.strftime('%Y-%m-%d'))
+                    date_value = col.strftime('%Y-%m-%d')
+                    cell = table.TableCell(valuetype="date", datevalue=date_value, stylename=ds)
+                    cell.addElement(text.P(text=date_value))
                 elif isinstance(col, dt.time):
                     cell = table.TableCell(valuetype="time", timevalue=col.strftime('%H:%M:%S'))
                 elif col is None: