Why does Java’s java.time.format.DateTimeFormatter#format(LocalDateTime) add a year?
From Wikipedia: [YYYY] indicates the ISO week-numbering year which is slightly different from the traditional Gregorian calendar year (see below). YYYY is an ISO-8601 style representation of the year. yyyy is the Gregorian year-of-era representation. Since the the calculation of the two can be different by +1 or -1, hence the formatting. More useful info … Read more