A leap year starting on Thursday is any year with 366 days (i.e. it includes 29 February) that begins on Thursday 1 January, and ends on Friday 31 December. Its dominical letters hence are DC. The most recent year of such kind was 2004 and the next one will be 2032 in the Gregorian calendar or, likewise, 2016 and 2044 in the obsolete Julian calendar.
This is the only leap year with three occurrences of Tuesday the 13th: those three in this leap year occur three months (13 weeks) apart: in January, April, and July. Common years starting on Monday share this characteristic, in the months of February, March, and November.
Any leap year that starts on Monday, Wednesday or Thursday has two Friday the 13ths: those two in this leap year occur in February and August.
Calendars
Applicable years
Gregorian Calendar
Leap years that begin on Thursday, along with those starting on Monday and Saturday, occur least frequently: 13 out of 97 (≈ 13.402%) total leap years in a 400-year cycle of the Gregorian calendar. Their overall occurrence is thus 3.25% (13 out of 400).
For this kind of year, the corresponding ISO year has 53 weeks, and the ISO week 10 (which begins March 1) and all subsequent ISO weeks occur earlier than in all other years, and exactly one week earlier than common years starting on Friday, for example, June 20 falls on week 24 in common years starting on Friday, but on week 25 in leap years starting on Thursday, despite falling on Sunday in both types of year. That means that moveable holidays may occur one calendar week later than otherwise possible, e.g. Gregorian Easter Sunday in week 17 in years when it falls on April 25 and which are also leap years, falling on week 16 in common years.
Julian Calendar
Like all leap year types, the one starting with 1 January on a Thursday occurs exactly once in a 28-year cycle in the Julian calendar, i.e. in 3.57% of years. As the Julian calendar repeats after 28 years that means it will also repeat after 700 years, i.e. 25 cycles. The year's position in the cycle is given by the formula ((year + 8) mod 28) + 1).
Holidays
International
Valentine's Day falls on a Saturday
The leap day (February 29) falls on a Sunday
World Day for Grandparents and the Elderly falls on July 25
Halloween falls on a Sunday
Christmas Day falls on a Saturday
Roman Catholic Solemnities
Epiphany falls on a Tuesday
Candlemas falls on a Monday
Saint Joseph's Day falls on a Friday
The Annunciation of Jesus falls on a Thursday
The Nativity of John the Baptist falls on a Thursday
The Solemnity of Saints Peter and Paul falls on a Tuesday
The Transfiguration of Jesus falls on a Friday
The Assumption of Mary falls on a Sunday
The Exaltation of the Holy Cross falls on a Tuesday
All Saints' Day falls on a Monday. This is the only year when All Saints Day falls in ISO week 45. They fall in ISO week 44 in all other years. All Souls' Day falls on a Tuesday The Feast of Christ the King falls on November 21 (or on its latest possible date of October 31 in versions of the calendar between 1925 and 1962) The First Sunday of Advent falls on November 28 The Immaculate Conception falls on a Wednesday Gaudete Sunday falls on December 12 Rorate Sunday falls on December 19
Australia and New Zealand
Australia Day falls on a Monday
Waitangi Day falls on a Friday
Daylight saving ends on April 4
ANZAC Day falls on a Sunday, and in some years coincides with Easter Sunday falling on its latest possible date Mother's Day falls on May 9 Father's Day falls on September 5 Daylight saving begins on September 26 in New Zealand and October 3 in Australia
British Isles
Saint David's Day falls on a Monday. This is the only year when Saint David’s Day falls in ISO week 10. They fall in ISO week 9 in all other years Mother's Day falls on March 7, March 14, March 21, March 28 or on its latest possible date of April 4 Daylight saving begins on March 28 Saint Patrick's Day falls on a Wednesday Saint George's Day falls on a Friday, and in some years coincides with Good Friday falling on its latest possible date Father's Day falls on June 20 Orangeman's Day falls on a Monday. This is the only year when Orangeman’s Day falls in ISO week 29. They fall in ISO week 28 in all other years Daylight saving ends on its latest possible date, October 31. This is the only year when Daylight Saving Time ends in ISO week 44. They end in ISO week 43 in all other years Guy Fawkes Night falls on a Friday Saint Andrew's Day falls on a Tuesday