# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1427217249 -3600
# Node ID 4c9b410b0e00c1dd2e71a57e24128c4b4afb2c47
# Parent  c057e9aac79c391f8a32b3b813914512d0a8d235
Added missing to_datetime function.

diff -r c057e9aac79c -r 4c9b410b0e00 imiptools/data.py
--- a/imiptools/data.py	Tue Mar 24 16:14:55 2015 +0100
+++ b/imiptools/data.py	Tue Mar 24 18:14:09 2015 +0100
@@ -23,8 +23,8 @@
 from datetime import datetime, timedelta
 from email.mime.text import MIMEText
 from imiptools.dates import format_datetime, get_datetime, get_duration, \
-                            get_freebusy_period, get_period, to_timezone, \
-                            to_utc_datetime
+                            get_freebusy_period, get_period, to_datetime, \
+                            to_timezone, to_utc_datetime
 from imiptools.period import period_overlaps
 from pytz import timezone
 from vCalendar import iterwrite, parse, ParseError, to_dict, to_node
diff -r c057e9aac79c -r 4c9b410b0e00 imiptools/dates.py
--- a/imiptools/dates.py	Tue Mar 24 16:14:55 2015 +0100
+++ b/imiptools/dates.py	Tue Mar 24 18:14:09 2015 +0100
@@ -249,6 +249,18 @@
 
     return date(dt.year, dt.month, dt.day)
 
+def to_datetime(dt, tzid):
+
+    """
+    Return a datetime for 'dt', using the start of day for dates, and using the
+    'tzid' for the conversion.
+    """
+
+    if isinstance(dt, datetime):
+        return dt
+    else:
+        return get_start_of_day(dt, tzid)
+
 def get_start_of_day(dt, tzid):
 
     """