Hi!
It looks like a sub optimal choice to have used string constants instead of integer. However it could be still possible to define new constants as numeric. It is then possible to do whatever needs to be done as post or pre ops for the respective constants.
I'm not sure what integers have to do with it? The constants define date formats that are in common use, RFC2616 is one of the commonest on the web and we don't have a constant for it...
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