I don't think Quaker date calculator results should be entered in the vital data fields.
Seems to me the calculated dates are not helpful in the matching and merging process.
In the case of Lois Ivory, her date of birth was published in the Vital Records of Lynn, Massachusetts ... as "7 : 12 m. : 1660."
The calculator produces her date of birth "18 Feb 1661."
I would prefer to see "7 Feb 1661" entered in the data field.
In the narrative, I would use the double date, "7 February 1660/1, or "7 : 12 m. : 1660" or even "7 : 12 m. : 1660 [7 February 1660/1]."
If someone finds the Quaker calculated date to be noteworthy, I suggest it could be included in a research note.
Back to Lois Ivory, all we are trying to do is correct the rather simple error made by a no doubt hard-working FamilySearch volunteer when they created a database entry previously relied upon as a source for her birth--the date was extracted as "7 Feb 1660," but should have been "7 Feb 1661." The FS database entry is here; the record from which the entry was extracted is here (img. 115 of 229). The image is a page from the published Vital Records of Lynn, Massachusetts ...--it is the same page linked earlier, see it at Hathi Trust. To my knowledge, FamilySearch double dating era extraction guidelines call for the "later year" to be entered into the system (just as WikiTree uses the later year in its data field).
Thank you for supporting WikiTree.--Gene