--- a/multimerge.py	Tue Jul 12 11:19:38 2016 +0300
+++ b/multimerge.py	Tue Jul 12 11:44:25 2016 +0300
@@ -13,7 +13,7 @@
 import re
 import codecs
 import math
-#import time
+import time
 #import datetime
 
 import smtplib
@@ -345,7 +345,8 @@
 cfg.mdef("source_regmap", False, cfg.is_list, cfg.trans_list, [1, 2])
 cfg.mdef("source_regmap_len", False, None, None, len(cfg.source_regmap))
 
-cfg.mdef("dest_name", True, cfg.is_string, None, u"Raahen kansainvälisyystoiminta")
+cfg.mdef("dest_name", True, cfg.is_string, None, u"Raahen kansainvälisyystoiminta [{0}]")
+cfg.mdef("dest_regex", True, cfg.is_string, None, u"^Raahen kansainvälisyystoiminta")
 cfg.mdef("dest_id", True, cfg.is_string, None, None)
 
 cfg.mdef("noauth_local_webserver", False, None, None, True)
@@ -406,13 +407,10 @@
         gcm_fatal(u"Invalid source_regmap: {0}".format(str(e)))
 
 
-if not cfg.dest_name and not cfg.dest_id:
+if not cfg.dest_regex and not cfg.dest_id:
     gcm_fatal(u"Target calendar ID or name required, but not set.")
 
 
-if cfg.dest_name:
-    cfg.mset("dest_name", cfg.mget("dest_name").strip())
-
 
 ## Initialize and authorize API connection
 credentials = gcm_get_credentials(cfg)
@@ -445,12 +443,13 @@
 
 ## Filter desired SOURCE calendars based on specified regexp
 src_re = re.compile(cfg.source_regex, re.UNICODE)
+dst_re = re.compile(cfg.dest_regex, re.UNICODE)
 src_calendars = []
 dst_calendar = None
 for calendar in calendars:
     if u"summary" in calendar:
         # Find destination calendar ID if not set
-        if not cfg.dest_id and cfg.dest_name == calendar["summary"].strip():
+        if not cfg.dest_id and dst_re.match(calendar["summary"]):
             cfg.mset("dest_id", calendar["id"])
             dst_calendar = calendar
 
@@ -575,5 +574,16 @@
         except Exception as e:
             gcm_fatal(u"Failed to delete stale event:\n{0}\n\nERROR: {1}\n".format(event, str(e)))
 
+## Update the target calendar name with timestamp
+t_time = time.localtime()
+t_str = time.strftime("%d.%m.%Y %H:%M", t_time)
+gcm_debug(u"Updating target calendar name timestamp {0}".format(t_str))
+
+try:
+    dst_calendar["summary"] = cfg.dest_name.format(t_str)
+    new_calendar = service.calendars().update(calendarId=cfg.dest_id, body=dst_calendar).execute()
+except Exception as e:
+    gcm_fatal(u"Failed to update target calendar:\n{0}\n\nERROR: {1}\n".format(dst_calendar, str(e)))
+
 
 gcm_debug(u"Finished.")