Description of problem:
Trying to install a package after having the system in the year 2150 for a while

Version-Release number of selected component:
yum-3.4.3-106.fc20

Additional info:
reporter:       libreport-2.1.9
cmdline:        /usr/bin/python /usr/bin/yum install kdm
dso_list:       python-urlgrabber-3.9.1-32.fc20.noarch
executable:     /usr/bin/yum
kernel:         3.11.8-300.fc20.x86_64
runlevel:       N 5
type:           Python
uid:            0

Truncated backtrace:
grabber.py:2423:estimate:OverflowError: (34, '\xc4\x8c\xc3\xadseln\xc3\xbd v\xc3\xbdsledek mimo rozsah')

Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in <module>
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 316, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 219, in main
    return_code = base.doTransaction()
  File "/usr/share/yum-cli/cli.py", line 630, in doTransaction
    problems = self.downloadPkgs(downloadpkgs, callback_total=self.download_callback_total_cb)
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 2449, in downloadPkgs
    **kwargs
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 1054, in getPackage
    **kwargs
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 1012, in _getFile
    result = self.grab.urlgrab(misc.to_utf8(relative), local,
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 693, in <lambda>
    grab = property(lambda self: self._getgrab())
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 688, in _getgrab
    self._setupGrab()
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 654, in _setupGrab
    failure_callback=mirror_failure)
  File "/usr/lib/python2.7/site-packages/urlgrabber/mirror.py", line 275, in __init__
    self.mirrors.sort(key=estimate, reverse=True)
  File "/usr/lib/python2.7/site-packages/urlgrabber/mirror.py", line 269, in estimate
    speed, fail = _TH.estimate(m['mirror'])
  File "/usr/lib/python2.7/site-packages/urlgrabber/grabber.py", line 2423, in estimate
    k = 2**((ts - time.time()) / default_grabber.opts.half_life)
OverflowError: (34, '\xc4\x8c\xc3\xadseln\xc3\xbd v\xc3\xbdsledek mimo rozsah')

Local variables in innermost frame:
ts: 4294967314
default_speed: 1000000.0
baseurl: 'http://download.eng.brq.redhat.com/pub/fedora/linux/updates/testing/20/x86_64/'
host: 'download.eng.brq.redhat.com'
fail: 0
speed: 20420000