First working release.

Other files (not .docx) support is not guaranteed

modules/time_tools/time_diff.py

@@ -0,0 +1,9 @@
+import datetime
+
+
+def compute_time_diff(date_first, time_first,
+                      date_second, time_second):
+    dt1 = datetime.datetime.combine(date_first, time_first)
+    dt2 = datetime.datetime.combine(date_second, time_second)
+
+    return int((max(dt1, dt2) - min(dt1, dt2)).total_seconds() / 60)