First a little background - the early Quakers used numbers for their dates - 1st day, 2nd mo, 1732 for example. The Julian calendar year began on March 15, the Gregorian calendar began on January 1. The Gregorian calendar was not adopted consistently among the Protestant nations in any rerasonable fashion.
Britain and it's colonies adopted the Gregorian calendar in 1752, but each Quaker Monthly meeting shifted in it's own time, however, they did label dates OS (julian) or NS (Gregorian).
I have observed the divergence in Quaker dates of as much as ten months as multiple people continually add two months to every date. I recommend that in the 'ABOUT' field, the original Quaker date from the monthly meeting records be recorded, where possible.
Janet Palo-Jackson, curator, Quaker descendant
PS any other Quaker questions welcomed.
As more records are merged together, the dates in the early Quaker families in New Jersey and Pennsylvania (and probably elsewhere as well) are slip