Time travel

[Lee Merrill]

I'm seeing an anomaly in the python time function on March 9, 2008
(the "spring foward" time):

>>> time.mktime((2008, 3, 9, 2, 59, 59, 0, 0, -1))
1205049599.0
>>> time.mktime((2008, 3, 9, 3, 0, 0, 0, 0, -1))
1205046000.0

Does anyone have an idea as to what might cause a 4000 seconds
backwards jump on March 9th of last year? I would have expected 3600
seconds.

Thanks,
Lee

P.S. A full program demonstrating the question:

#!/usr/bin/env python

import time, datetime

d1 = datetime.datetime(2008, 3, 9, 2, 59, 0).timetuple()
#!/usr/bin/env python

import time, datetime

d1 = datetime.datetime(2008, 3, 9, 2, 59, 0).timetuple()
d2 = datetime.datetime(2008, 3, 9, 3, 0, 0).timetuple()
t1 = time.mktime(d1)
t2 = time.mktime(d2)

print t1, t2