Assertion: calendar's year | /r/HasProperty | due
Facets:
value: to some countries
type: LOCATION
Source sentences:
text: For example, in "10/21 February 1750/51", the dual day of the month is due to the correction for excess leap years in the Julian calendar by the Gregorian calendar, and the dual year is due to some countries beginning their numbered year on 1 January while others were still using another date.