Allow timestamps in format to be None, indicating the current time.

src/conf.py

@@ -282,6 +282,8 @@ registerChannelValue(supybot.reply.format, 'time',
     for the time module to see valid formatting characters for time
     formats."""))
 def timestamp(t):
+    if t is None:
+        t = time.time()
     t = time.localtime(t)
     format = conf.get(supybot.reply.format.time, dynamic.channel)
     return time.strftime(format, t)

src/utils/str.py

@@ -334,6 +334,8 @@ def toBool(s):
 
 # Replace me!
 def timestamp(t):
+    if t is None:
+        t = time.time()
     return time.ctime(t)
 
 _formatRe = re.compile('%([bfhiLnpqstu%])')