added created.dd and modified.dd to template system, closes #135

tests/test_datetime_formatter.py

@@ -0,0 +1,21 @@
+""" test datetime_formatter.DateTimeFormatter """
+import pytest
+
+def test_datetime_formatter():
+    import datetime
+    import locale
+    from osxphotos.datetime_formatter import DateTimeFormatter
+    
+    locale.setlocale(locale.LC_ALL, "en_US")
+
+    dt = datetime.datetime(2020,5,23)
+    dtf = DateTimeFormatter(dt)
+
+    assert dtf.date == "2020-05-23"
+    assert dtf.year == "2020"
+    assert dtf.yy == "20"
+    assert dtf.month == "May"
+    assert dtf.mon == "May"
+    assert dtf.mm == "05"
+    assert dtf.dd == "23"
+    assert dtf.doy == "144"