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{{Short description|Type of year (GF) on a solar calendar}} |
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A '''leap year starting on Monday''' is any year with 366 days (i.e. it includes 29 February) that begins on ], 1 January, and ends on ], 31 December. Its ]s hence are '''GF'''. The most recent year of such kind was ] and the next one will be ] in the ]<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> or, likewise, ], ], and ] in the obsolete ]. |
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A '''leap year starting on Monday''' is any year with 366 days (i.e. it includes ]) that begins on ], 1 January, and ends on ], 31 December. Its ]s hence are '''GF'''. The most recent year of such kind was ] and the next one will be ] in the ] <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> or, likewise, ] and ] in the obsolete ]. |
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Any leap year that starts on ], ] or ] has two ]s: those two in this leap year ] and ]. ] share this characteristic. |
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In this leap year, ] is on its earliest possible date, ], ] is on a ], ] is on ], the ] is on a ], ] is on a ], ] is on ], ] is on a ], ] and ] are on a Thursday, ] is on ], ] is on its latest possible date, ], ] is on a ], ] is on its latest possible date, ], and ] is on a ]. This leap year also has the shortest gap between Leap Day ({{#time: F j|2024/02/29}}) and the start of Daylight Saving Time in Europe (March 31), only by {{age in days|2024|Feb|29|2024|Mar|31}} days. |
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The Election Day in the USA is on ], as well in ]. |
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== Calendars == |
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== Calendars == |
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<!-- To avoid arbitrary years, use the most recent or upcoming year of this type. 2024 is the most next year of this type. --> |
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<!-- To avoid arbitrary years, use the most recent of this type. 2024, the current year, is of this type. --> |
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{{calendar|year=2024|show_year=off|title=Calendar for any ] starting on Monday,<br />presented as common in many English-speaking areas}} |
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{{calendar|year=2024|show_year=off|title=Calendar for any ] starting on Monday,<br />presented as common in many English-speaking areas}} |
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== Applicable years == |
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== Applicable years == |
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=== Gregorian Calendar === |
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=== Gregorian Calendar === |
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Leap years that begin on Monday, along with those that ] or ], occur least frequently: 13 out of 97 (≈ 13.402%) total leap years of the ]. Their overall occurrence is thus 3.25% (13 out of 400). |
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Leap years that begin on Monday, along with those ] and ], occur least frequently: 13 out of 97 (≈ 13.4%) total leap years in a 400-year cycle of the ]. Their overall frequency is thus 3.25% (13 out of 400) of years. |
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{| class="wikitable" |
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{| class="wikitable" |
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! style="background-color:#efefef;" | ] |
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! style="background-color:#efefef;" | ] |
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| colspan="8" | ''prior to first adoption (proleptic)''|| || ] |
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!] |
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|] |
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|] |
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|] |
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! style="background-color:#efefef;" | ] |
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! style="background-color:#efefef;" | ] |
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! style="background-color:#efefef;" | ] |
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! style="background-color:#efefef;" | ] |
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| || ] || || || ] || || || ] || || |
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| || 2520 || || || 2548 || || || 2576 || || |
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! style="background-color:#efefef;" | ] |
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! style="background-color:#efefef;" | ] |
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| || ] || || || ] || || || ] || || |
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| || 2616 || || || 2644 || || || 2672 || || |
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{| class="wikitable" |
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400 year cycle |
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|+ 400-year cycle |
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century 1: 024, 052, 080 |
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! 0–99 |
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| 24 || 52 || 80 || |
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century 2: 120, 148, 176 |
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|- |
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! 100–199 |
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century 3: 216, 244, 272 |
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| 120 || 148 || 176 || |
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|- |
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century 4: 312, 340, 368, 396 |
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! 200–299 |
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| 216 || 244 || 272 || |
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|- |
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! 300–399 |
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| 312 || 340 || 368 || 396 |
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=== Julian Calendar === |
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=== Julian Calendar === |
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{| class="wikitable" |
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{| class="wikitable" |
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|+ Julian leap years \Tuesday |
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|+ Julian leap years starting on Monday |
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!scope=row| Decade |
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!scope=row| Decade |
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! 1st !! 2nd !! 3rd !! 4th !! 5th !! 6th !! 7th !! 8th !! 9th !! 10th |
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! 1st !! 2nd !! 3rd !! 4th !! 5th !! 6th !! 7th !! 8th !! 9th !! 10th |
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| || 2120 || || || 2148 || || || 2176 || || |
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| || 2120 || || || 2148 || || || 2176 || || |
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== Holidays == |
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=== International === |
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* ] falls on a ] |
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* The leap day (]) falls on a ] |
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* ] falls on its latest possible date, ] |
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* ] falls on a ] |
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* ] falls on a ] |
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=== Roman Catholic Solemnities === |
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* ] falls on a ] or, in places when it is transferred to a Sunday, January 7 |
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* ] falls on a ] |
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* ] falls on a ] |
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* The ] falls on a ] |
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* The ] falls on a ] |
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* The ] falls on a ] |
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* The ] falls on a ] |
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* The ] falls on a ] |
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* The ] falls on a ] |
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* ] falls on a ] |
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* ] falls on a ] |
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* The ] falls on ] (or on ] in versions of the calendar between 1925 and 1962) |
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* The ] falls on ] |
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* The ] falls on a ], thus transferred to Monday, December 9. |
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* ] falls on ] |
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* ] falls on ] |
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=== Australia and New Zealand === |
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* ] falls on a ] |
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* ] falls on a ] |
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* ] ends on its latest possible date, ] – the period of daylight saving which ends on ] of a leap year starting on Monday is the only period ending in any year to last 27 weeks in Australia and 28 weeks in New Zealand; in all other instances, the period of daylight saving lasts only 26 weeks in Australia and 27 weeks in New Zealand |
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* ] falls on a ] |
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* ] falls on ] |
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* ] falls on its earliest possible date, ] |
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* Daylight saving begins on ] in New Zealand and ] in Australia |
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=== British Isles === |
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* ] falls on a ] |
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* ] falls on ], ], ], ] or ] |
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* ] falls on a ] |
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* ] begins on its latest possible date, ] |
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* ] falls on a ] |
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* ] falls on ] |
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* ] falls on a ] |
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* Daylight saving ends on ] |
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* ] falls on a ] |
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* ] falls on a ] |
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=== Canada === |
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* ] begins on ] |
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* ] falls on ] |
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* ] falls on ] |
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* ] falls on ] |
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* ] falls on a ] |
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* ] falls on ] |
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* ] falls on its latest possible date, ] |
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* Daylight saving ends on ] |
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=== United States === |
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* ] falls on its earliest possible date, ] |
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* ] falls on ] |
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* ] begins on ] |
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* ] falls on ] |
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* ] falls on ] |
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* ] falls on ] |
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* ] falls on a ] |
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* ] falls on a ] |
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* ] falls on ] |
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* ] falls on ] |
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* ] falls on its latest possible date, ] (this is the only year when Martin Luther King Jr. Day and Columbus Day are 39 weeks apart) They are 38 weeks apart in all other years |
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* Daylight saving ends on ] |
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* ] falls on ] |
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* ] falls on its latest possible date, ] (this is also the only year when Martin Luther King Jr. Day and Thanksgiving are 318 days apart) They are 311 days apart in all other years |
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==References== |
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==References== |
Like all leap year types, the one starting with 1 January on a Monday 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).