Issue with date2num

[BobDenar]

Hi,

I use timezones intensively, and I had an issue with date2num on line 209 of utils/dateintern.py.
The code refers to an undefined variable dwhen:

def date2num(dt, tz=None):
    """
    Convert :mod:`datetime` to the Gregorian date as UTC float days,
    preserving hours, minutes, seconds and microseconds.  Return value
    is a :func:`float`.
    """
    if tz is not None:
        dt = tz.localize(dwhen)

    if hasattr(dt, 'tzinfo') and dt.tzinfo is not None:
        delta = dt.tzinfo.utcoffset(dt)
        if delta is not None:
            dt -= delta

    base = float(dt.toordinal())
    if hasattr(dt, 'hour'):
        # base += (dt.hour / HOURS_PER_DAY +
        #          dt.minute / MINUTES_PER_DAY +
        #          dt.second / SECONDS_PER_DAY +
        #          dt.microsecond / MUSECONDS_PER_DAY
        #         )
        base = math.fsum(
            (base, dt.hour / HOURS_PER_DAY, dt.minute / MINUTES_PER_DAY,
             dt.second / SECONDS_PER_DAY, dt.microsecond / MUSECONDS_PER_DAY))

    return base

My guess is that dwhen must be substituted with dt.

Thanks

[backtrader]

Can you show how you use the timezones? Thanks

[BobDenar]

On timers with tzdata parameters to trigger timers on market place's timezone.
Our historicals datas are stored into a MongoDB through Arctic library, since ticks and bars are stored UTC, when building a feed I add tz parameter to point to the proper timezone.

I guess that those uses of timezones pinpointed me to this issue.