setting validDate

[rafatoshio]

First of all, congratulations on your initiative. I believe that your project is a great alternative to pygrib.

I have been testing the examples provided in the notebook, and I have some observations:

In the writing example, in section 1, it might be clearer to write it as follows:
Python

for attr in olddata.attrs_by_section(1):
    try:
        attrvalue = getattr(olddata, attr).value
    except AttributeError:
        attrvalue = getattr(olddata, attr)
    setattr(newmsg, attr, attrvalue)

I also noticed that I can modify the runtime by simply doing:
Python

newmsg.refDate = run

However, I cannot do the same with the validDate. Although there is no error when trying to assign the values, they are not modified. I could only change it by doing:
Python

msg.yearOfEndOfTimePeriod = fcst.year
msg.monthOfEndOfTimePeriod = fcst.month
msg.dayOfEndOfTimePeriod = fcst.day
msg.hourOfEndOfTimePeriod = fcst.hour
msg.minuteOfEndOfTimePeriod = fcst.minute
msg.secondOfEndOfTimePeriod = fcst.second

I would appreciate it if you could provide a more straightforward way to modify the validDate.

Finally, I would be grateful if you could recommend additional materials that teach me how to write in GRIB2.