model_input_formatter (and get_fcast_definition) don't always work for dynamical.org

[williamhobbs]

For example, IFS ens and GEFS are only available for the 00 UTC cycles.

Something like the adjustments below can be applied as a fix:

available_date = pd.Timestamp.now('UTC')
run_length_needed = 246-18 
lead_time_to_start_needed = 0
init_date, run_length, lead_time_to_start = adjust_forecast_datetimes(
    available_date=available_date,
    run_length_needed=run_length_needed,
    lead_time_to_start_needed=lead_time_to_start_needed,
    model='gefs'
)
print(init_date, run_length, lead_time_to_start)

# adjust for dynamical
init_date_new = init_date.floor('24h')
offset = (init_date1 - init_date_new).seconds //3600
init_date = init_date_new
lead_time_to_start += offset

print(init_date, run_length, lead_time_to_start)