Editing Leap year starting on Saturday (section)

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A '''leap year starting on Saturday''' is any year with 366 days (i.e. it includes 29 February) that begins on [[Saturday]], 1 January, and ends on [[Sunday]], 31 December. Its [[dominical letter]]s hence are '''BA'''. The most recent year of such kind was [[2000]], and the next one will be [[2028]] in the [[Gregorian calendar]] or, likewise [[2012]] and [[2040]] in the obsolete [[Julian calendar]]. In the [[Gregorian calendar]], [[century leap year|years divisible by 400]] are always leap years starting on Saturday. The most recent such occurrence was [[2000]] and the next one will be [[2400]], see [[#Applicable years|below for more]].<ref name="math">{{cite web|url=https://webspace.science.uu.nl/~gent0113/calendar/isocalendar.htm |author=Robert van Gent |title=The Mathematics of the ISO 8601 Calendar |publisher=Utrecht University, Department of Mathematics |date=2017 |access-date=20 July 2017}} </ref>

Any leap year that starts on [[Saturday]] has only one [[Friday the 13th]]: the only one in this leap year [[October 13|occurs in October]]. [[common year starting on Sunday|Common years starting on Sunday]] share this characteristic, but also have another in [[January]]. From [[August]] of the [[Common year starting on Friday|common year preceding that year]] until [[October]] in this type of year is also the longest period (14 months) that occurs without a [[Friday the 13th]]. [[common year starting on Tuesday|Common years starting on Tuesday]] share this characteristic, from [[July]] of the year that precedes it to [[September]] in that type of year.

These types of years are the only ones which contain 54 different calendar weeks (2 partial, 52 in full) in areas of the world where Sunday is considered the first day of the week, and also the only type of year to contain 53 full weekends.

This year has four months (January, April, July and October) which begin on a weekend-day. This is also the only type of leap year in which the first and last day of the calendar year fall on weekend-days.