App engine cron syntax validation

gistfile1.txt

>>> import sys
>>> sys.path.append('/usr/local/google_appengine/')
>>> from dev_appserver import fix_sys_path
>>> fix_sys_path()
>>> from google.appengine.api.croninfo import GrocValidator
>>> GrocValidator().Validate('invalidsyntax')
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/croninfo.py", li
ne 78, in Validate
    value, e.args[0]))
ValidationError: schedule 'invalidsyntax' failed to parse: line 1:10 mismatched character u't' expecting 'c'
>>> GrocValidator().Validate('every day 02:00')
'every day 02:00'