Added more formats for specifying period when defining UserData classes.
When defining the period for UserData classes, UserCatData, ODAPCatData, ClimRCatData, the list can be composed of str, pd.Timestamp, or datetime.datetime dates.
When defining the period for UserData classes, UserCatData, ODAPCatData, ClimRCatData, the list can be composed of str, pd.Timestamp, or datetime.datetime dates.