Package dependencies are not declared

If I install the package in its current version (1.4) there are errors because of undeclared package dependencies (python-dateutil I assume) within setup.py:

Downloading/unpacking python-crontab>=0.9.6
  Downloading python-crontab-1.4.tar.gz
  Running setup.py egg_info for package python-crontab
    Traceback (most recent call last):
      File "<string>", line 14, in <module>
      File "/var/lib/jenkins/workspace/anna/PYTHON/Python2.7/env/build/python-crontab/setup.py", line 21, in <module>
        from crontab import __version__, __pkgname__
      File "crontab.py", line 74, in <module>
        from cronlog import CronLog
      File "cronlog.py", line 23, in <module>
        from dateutil import parser as dateparse
    ImportError: No module named dateutil
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):

  File "<string>", line 14, in <module>

  File "/var/lib/jenkins/workspace/anna/PYTHON/Python2.7/env/build/python-crontab/setup.py", line 21, in <module>

    from crontab import __version__, __pkgname__

  File "crontab.py", line 74, in <module>

    from cronlog import CronLog

  File "cronlog.py", line 23, in <module>

    from dateutil import parser as dateparse

ImportError: No module named dateutil