--- a/candolint/utils.py	Sun Jul 17 05:10:35 2016 +0800
+++ b/candolint/utils.py	Sun Jul 17 05:23:08 2016 +0800
@@ -1,8 +1,17 @@
 from __future__ import absolute_import
 
 
+from datetime import datetime
 from os.path import abspath, dirname, join
 
 
 def rel(*parts):
     return abspath(join(dirname(dirname(__file__)), *parts))
+
+
+def timestamp():
+    return datetime.utcnow().strftime('%Y-%m-%dT%H:%M:%S+00:00')
+
+
+def parse_timestamp(value):
+    return datetime.strptime(value, '%Y-%m-%dT%H:%M:%S+00:00')

--- a/checker.py	Sun Jul 17 05:10:35 2016 +0800
+++ b/checker.py	Sun Jul 17 05:23:08 2016 +0800
@@ -3,7 +3,6 @@
 
 import os
 from argparse import ArgumentParser, FileType
-from datetime import datetime
 from fnmatch import fnmatchcase
 from shutil import rmtree
 from subprocess import check_call, check_output, CalledProcessError
@@ -11,7 +10,7 @@
 
 import yaml
 
-from candolint.utils import rel
+from candolint.utils import rel, timestamp
 
 
 def run_ignore_codes(fn, args, codes):
@@ -44,10 +43,6 @@
         return False
 
 
-def now():
-    return datetime.utcnow().strftime('%Y-%m-%dT%H:%M:%S+00:00')
-
-
 def read_linter_config(name, path=rel('linters')):
     try:
         fd = open(os.path.join(path, '{}.yml'.format(name)))
@@ -234,7 +229,7 @@
 
 
 def wrapper(config):
-    print('# C&O job started: {}'.format(now()))
+    print('# C&O job started: {}'.format(timestamp()))
     tmp = mkdtemp(prefix='candolint.')
 
     if not execute(tmp, config):
@@ -243,12 +238,12 @@
     print('# C&O task: cleanup')
     rmtree(tmp)
 
-    print('# C&O job finished: {}'.format(now()))
+    print('# C&O job finished: {}'.format(timestamp()))
 
 
 def bad_exit():
     print('# C&O job failed (exception not caught)')
-    print('# C&O job finished: {}'.format(now()))
+    print('# C&O job finished: {}'.format(timestamp()))
 
 
 def main():

--- a/incoming.py	Sun Jul 17 05:10:35 2016 +0800
+++ b/incoming.py	Sun Jul 17 05:23:08 2016 +0800
@@ -5,17 +5,12 @@
 import re
 import sys
 from argparse import ArgumentParser, FileType
-from datetime import datetime
 from urlparse import urlparse
 
 from tornado.escape import json_encode
 
 from candolint.models import database, Project, Change, Check
-from candolint.utils import rel
-
-
-def parse_timestamp(value):
-    return datetime.strptime(value, '%Y-%m-%dT%H:%M:%S+00:00')
+from candolint.utils import parse_timestamp, rel
 
 
 def parse_project_url(url):

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_utils.py	Sun Jul 17 05:23:08 2016 +0800
@@ -0,0 +1,9 @@
+from datetime import datetime
+
+from candolint.utils import parse_timestamp, timestamp
+
+
+def test_timestamp_and_parse():
+    result = parse_timestamp(timestamp())
+    assert isinstance(result, datetime)
+    assert result.utcoffset() is None