EDirect pulling [crdt] against [entrez] to get all PMID's for 2017 where they don't match

[tomlaheyh]

I use [crdt] in all my PubMed searches and there seems to be no way to pull this date from xml. So I either need a way to pull that data, or even better I want to know the gap where the crdt date is different than the entrez date for the year 2017. If the gap is very small I can use entrez in my EDirect as a direct replacement of [crdt], but if 10-20 percent or more don't match then I can't and need another method to pull [crdt]. So I need a list when they are diff with PMID, crdt date and entrez date for 2017. I can then see how many records are different and the average gap in days between the two when they are different.

Any help or suggestions are greatly appreciated!
Tom