Converting Julian Dates to Gregorian
The original document for MSPC-D1Y has UK marriage entries from 1679 to 1681. Instructions for the indexing project say:
"England adopted the Gregorian calendar in 1752. Prior to 1752 in England, the year on the Julian calendar began in March and continued to the next February. This would mean that the 3rd month in 1730 would be May. In the Gregorian calendar adopted in 1752, the 3rd month would be March. When indexing records for this project, please convert the Julian calendar dates to their Gregorian calendar equivalents. Click here for help converting dates."
The problem with doing this is that dates in the index would not match dates in the document. This would make it more difficult, or at least more inconvenient, to find an entry in the document by searching for a date listed in the index. Date is the easiest thing to search in the document. Names are harder. The mismatch in dates would likely be confusing. I would suggest simply labeling the entire index for the document as having Julian dates rather than Gregorian dates, but make dates in the index and the document match. Then an entry in the document could be easily found by searching for a date listed in the index.
I would like to respectfully suggest that indexers should not be burdened with having to convert dates. That should be the responsibility of those who are trying to interpret data from a document.