Change timestamps in 100 mil documents

Hi All,
We have a timezone problem in the imported documents in Couchbase. Thats why we now do manually adjustment of the time and timezone in the presentation layer. But this is pretty hard to manage. We would prefer to adjust the documents with a new correct UTC timezone timestamp. In the Document ID there is also the timestamp included so just editing the document cant be done. It has to be stored as a new document. Now we are wondering how to change all 100 mil documents with a new optimized timestamp and remove the old documents so we dont get duplicates and 200 mil records after conversion. Is there an efficient and easy way?