feat: xls: add styling for date/time types

src/tablib/formats/_xls.py

@@ -1,6 +1,6 @@
 """ Tablib - XLS Support.
 """
-
+import datetime
 from io import BytesIO
 
 import xlrd
@@ -12,6 +12,9 @@
 # special styles
 wrap = xlwt.easyxf("alignment: wrap on")
 bold = xlwt.easyxf("font: bold on")
+datetime_style = xlwt.easyxf(num_format_str='M/D/YY h:mm')
+date_style = xlwt.easyxf(num_format_str='M/D/YY')
+time_style = xlwt.easyxf(num_format_str='h:mm:ss')
 
 
 class XLSFormat:
@@ -138,6 +141,13 @@ def dset_sheet(cls, dataset, ws):
                 elif len(row) < dataset.width:
                     ws.write(i, j, col, bold)
 
+                # format date types
+                elif isinstance(col, datetime.datetime):
+                    ws.write(i, j, col, datetime_style)
+                elif isinstance(col, datetime.date):
+                    ws.write(i, j, col, date_style)
+                elif isinstance(col, datetime.time):
+                    ws.write(i, j, col, time_style)
                 # wrap the rest
                 else:
                     try:

tests/test_tablib.py

@@ -12,6 +12,7 @@
 from pathlib import Path
 from uuid import uuid4
 
+import xlrd
 from openpyxl.reader.excel import load_workbook
 
 import tablib
@@ -1254,6 +1255,23 @@ def test_book_import_from_stream(self):
         book = tablib.Databook().load(in_stream, 'xls')
         self.assertEqual(book.sheets()[0].title, 'Founders')
 
+    def test_xls_export_with_dates(self):
+        date = dt.date(2019, 10, 4)
+        time = dt.time(14, 30)
+        date_time = dt.datetime(2019, 10, 4, 12, 30, 8)
+        data.append((date, time, date_time))
+        data.headers = ('date', 'time', 'date/time')
+        _xls = data.xls
+        xls_book = xlrd.open_workbook(file_contents=_xls, formatting_info=True)
+        row = xls_book.sheet_by_index(0).row(1)
+
+        def get_format_str(cell):
+            return xls_book.format_map[xls_book.xf_list[cell.xf_index].format_key].format_str
+
+        self.assertEqual('m/d/yy', get_format_str(row[0]))
+        self.assertEqual('h:mm:ss', get_format_str(row[1]))
+        self.assertEqual('m/d/yy h:mm', get_format_str(row[2]))
+
 
 class XLSXTests(BaseTestCase):
     def test_xlsx_format_detect(self):