Convert MATLAB datenums to/from Python datetimes

MATLAB_datetimes.py

from datetime import datetime, timedelta

# util for converting MATLAB datenum to Python datetime
# as described in http://stackoverflow.com/questions/13965740/converting-matlabs-datenum-format-to-python
def datenum2datetime(matlab_datenum):
    dt = datetime.fromordinal(int(matlab_datenum)) + timedelta(days=matlab_datenum%1) - timedelta(days = 366)
    return dt

# util for converting datetime to MATLAB datenum
# as described in http://stackoverflow.com/questions/8776414/python-datetime-to-matlab-datenum
def datetime2datenum(dt):
    dt = dt.replace(tzinfo=None)
    ord = dt.toordinal()
    mdn = dt + timedelta(days = 366)
    frac = (dt-datetime(dt.year,dt.month,dt.day,0,0,0)).seconds / (24.0 * 60.0 * 60.0)
    return mdn.toordinal() + frac