Editing Common year starting on Monday

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[[File:January_1900_calendar.jpg | thumb | right]]
A '''common year starting on Monday''' is any non-[[leap year]] (i.e., a year with 365 days) that begins on [[Monday]], [[1 January]], and ends on [[Monday]], [[31 December]]. Its [[dominical letter]] hence is '''G'''. The most recent year of such kind was [[2018]], and the next one will be [[2029]] in the [[Gregorian calendar]], or likewise, [[2019]] and [[2030]] in the [[Julian calendar]], see [[#Applicable years|below for more]]. This common year is one of the three possible common years in which a century year can begin on and occurs in century years that [[Century common year|yield a remainder of 300 when divided by 400]]. The most recent such year was [[1900]], and the next one will be 2300.

Any common year that starts on Monday has two [[Friday the 13th]]s: those two in this common year [[April 13|occur in April]] and [[July 13|July]].{{Globalize-inline|date=May 2022}}
From July of the year in this type of year to [[September 13|September]] in the year that follows this type of year is the longest period that occurs without a Friday the 13th, unless the following year is a [[leap year starting on Tuesday]], in which case the gap only 11 months, as the next Friday the 13th is already in [[June 13|June]].

This type of year has three instances of [[Tuesday the 13th]]: in February, March and November. [[Leap years starting on Thursday]] have this characteristic in January, April and July.

This year has four months (April, July, September and December) which begin on a weekend-day.

== Calendars ==
<!-- To avoid arbitrary years, use the most recent year of this type. 2018 was the most recent year of this type. -->
{{calendar|year=2018|show_year=off|title=Calendar for any [[common year]] starting on Monday,<br />presented as common in many English-speaking areas }}

{{calendar|year=2018|show_year=off|format=iso|row=3|zero=0|title=[[ISO 8601]]-conformant calendar with [[ISO week date|week numbers]] for<br />any common year starting on Monday (dominical letter G)}}

== Applicable years ==
=== Gregorian calendar ===
In the (currently used) Gregorian calendar, along with [[Common year starting on Sunday|Sunday]], [[Common year starting on Wednesday|Wednesday]], [[Common year starting on Friday|Friday]] or [[Common year starting on Saturday|Saturday]], the fourteen types of year (seven common, seven leap) repeat in a 400-year cycle (20871 weeks). Forty-three common years per cycle or exactly 10.75% start on a Monday. The 28-year sub-cycle only spans across century years divisible by 400, e.g. 1600, 2000, and 2400.
{| class="wikitable"
|+ Gregorian common years starting on Monday<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 |accessdate=20 July 2017}}</ref>
!scope=row| Decade
!colspan=2| 1st !! 2nd !!colspan=2| 3rd !! 4th !! 5th !!colspan=2| 6th !! 7th !!colspan=2| 8th !!colspan=2| 9th !!colspan=2| 10th
|- style="opacity: 0.5;"
! style="background-color:#efefef;" | [[16th century]]
|colspan=14| ''prior to first adoption (proleptic)'' ||colspan=2| [[1590]]
|- style="opacity: 0.5;"
! style="background-color:#efefef;" | [[17th century]]
| [[1601]] || [[1607]] || [[1618]] ||colspan=2| [[1629]] || [[1635]] || [[1646]] ||colspan=2| [[1657]] || [[1663]] ||colspan=2| [[1674]] ||colspan=2| [[1685]] ||colspan=2| [[1691]]
|-
! style="background-color:#efefef;" | [[18th century]]
|colspan=2| [[1703]] || [[1714]] ||colspan=2| [[1725]] || [[1731]] || [[1742]] || [[1753]] || [[1759]] || — ||colspan=2| [[1770]] || [[1781]] || [[1787]] ||colspan=2| [[1798]]
|-
! style="background-color:#efefef;" | [[19th century]]
|colspan=2| — || [[1810]] || [[1821]] || [[1827]] || [[1838]] || [[1849]] ||colspan=2| [[1855]] || [[1866]] ||colspan=2| [[1877]] ||colspan=2| [[1883]] || [[1894]] ||colspan|  [[1900]]
|-
! style="background-color:#efefef;" | [[20th century]]
|colspan=2| [[1906]] || [[1917]] ||colspan=2| [[1923]] || [[1934]] || [[1945]] ||colspan=2| [[1951]] || [[1962]] || [[1973]] || [[1979]] ||colspan=2| — ||colspan=2| [[1990]]
|-
! style="background-color:#efefef;" | [[21st century]]
| [[2001]] || [[2007]] || [[2018]]  ||colspan=2|[[2029]] || [[2035]] || [[2046]] || colspan=2| [[2057]] || [[2063]] ||colspan=2| [[2074]] ||colspan=2| [[2085]] ||colspan=2| [[2091]]
|-
! style="background-color:#efefef;" | [[22nd century]]
|colspan=2| [[2103]] || [[2114]] ||colspan=2| [[2125]] || [[2131]] || [[2142]] || [[2153]] || [[2159]] || — ||colspan=2| [[3rd millennium#22nd_century|2170]] || [[2181]] || [[2187]] ||colspan=2| [[2198]]
|-
! style="background-color:#efefef;" | [[23rd century]]
 |colspan=2| — || [[2210]] || [[2221]] || [[2227]] || [[2238]] || [[2249]] ||colspan=2| [[2255]] || [[2266]] ||colspan=2| [[2277]] ||colspan=2| [[3rd millennium#23rd century|2283]] || [[2294]] ||colspan| [[2300]]
|-
! style="background-color:#efefef;" | [[24th century]]
 |colspan=2| [[2306]] || [[2317]] ||colspan=2| [[2323]] || [[2334]] || [[2345]] ||colspan=2| [[2351]] || [[2362]] || [[2373]] || [[2379]] ||colspan=2| — ||colspan=2| [[2390]]
|}

{| class="wikitable"
|+ 400-year cycle
|-
! 0–99
| 1 || 7 || 18 || 29 || 35 || 46 || 57 || 63 || 74 || 85 || 91
|-
! 100–199
| 103 || 114 || 125 || 131 || 142 || 153 || 159 || 170 || 181 || 187 || 198
|-
! 200–299
| 210 || 221 || 227 || 238 || 249 || 255 || 266 || 277 || 283 || 294 ||
|-
! 300–399
| 300 || 306 || 317 || 323 || 334 || 345 || 351 || 362 || 373 || 379 || 390
|}

=== Julian calendar ===
In the Julian calendar, the fourteen types of year (seven common, seven leap) repeat in a [[solar cycle (calendar)|28-year cycle]] (1461 weeks). This sequence occurs exactly once within a cycle, and every common letter thrice.

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). Years 6, 12 and 23 of the cycle are common years beginning on Monday. 2017 is year 10 of the cycle. Approximately 10.71% of all years are common years beginning on Monday.

{| class="wikitable"
|+ Julian common years starting on Monday
!scope=row| Decade
!colspan=2| 1st !!colspan=2| 2nd !!colspan=2| 3rd !!colspan=2| 4th !!colspan=2| 5th !!colspan=2| 6th !!colspan=2| 7th !!colspan=2| 8th !!colspan=2| 9th !!colspan=2| 10th
|-
! style="background-color:#efefef;" | 15th century
|colspan=2| [[1403]] ||colspan=2| [[1414]] ||colspan=2| [[1425]] ||colspan=2| [[1431]] ||colspan=2| [[1442]] || [[1453]] || [[1459]] ||colspan=2| [[1470]] ||colspan=2| — || [[1481]] || [[1487]] ||colspan=2| [[1498]]
|-
! style="background-color:#efefef;" | 16th century
|colspan=2| [[1509]] ||colspan=2| [[1515]] ||colspan=2| [[1526]] ||colspan=2| [[1537]] ||colspan=2| [[1543]] ||colspan=2| [[1554]] ||colspan=2| [[1565]] ||colspan=2|[[1571]] ||colspan=2| [[1582]] <!-- Wikipedia year articles refer to Gregorian years from 1582 --> || 1593 || 1599
|-
! style="background-color:#efefef;" | 17th century
|colspan=2| 1610 ||colspan=2| — || 1621 || 1627 ||colspan=2| 1638 ||colspan=2| 1649 ||colspan=2| 1655 ||colspan=2| 1666 ||colspan=2| 1677 ||colspan=2| 1683 ||colspan=2| 1694
|-
! style="background-color:#efefef;" | 18th century
|colspan=2| 1705 ||colspan=2| 1711 ||colspan=2| 1722 || 1733 || 1739 ||colspan=2| 1750 ||colspan=2| — || 1761 || 1767 ||colspan=2| 1778 ||colspan=2| 1789 ||colspan=2| 1795
|-
! style="background-color:#efefef;" | 19th century
|colspan=2| 1806 ||colspan=2| 1817 ||colspan=2| 1823 ||colspan=2| 1834 ||colspan=2| 1845 ||colspan=2| 1851 ||colspan=2| 1862 || 1873 || 1879 ||colspan=2| 1890 ||colspan=2| —
|-
! style="background-color:#efefef;" | 20th century
| 1901 || 1907 ||colspan=2| 1918 ||colspan=2| 1929 ||colspan=2| 1935 ||colspan=2| 1946 ||colspan=2| 1957 ||colspan=2| 1963 ||colspan=2| 1974 ||colspan=2| 1985 ||colspan=2| 1991
|-
! style="background-color:#efefef;" | 21st century
|colspan=2| 2002 || 2013 || 2019 ||colspan=2| 2030 ||colspan=2| — || 2041 || 2047 ||colspan=2| 2058 ||colspan=2| 2069 ||colspan=2| 2075 ||colspan=2| 2086 ||colspan=2| 2097
|}

== Holidays ==

=== International ===
* [[Valentine's Day]] falls on a [[Wednesday]]
* [[Grandparents' Day|World Day for Grandparents and the Elderly]] falls on its earliest possible date, [[July 22]]
* [[Halloween]] falls on a [[Wednesday]]
* [[Christmas Day]] falls on a [[Tuesday]]

=== Roman Catholic Solemnities ===
* [[Epiphany (holiday)|Epiphany]] falls on a [[Saturday]]
* [[Candlemas]] falls on a [[Friday]]
* [[Saint Joseph's Day]] falls on a [[Monday]]
* The [[Annunciation of Jesus]] falls on a [[Sunday]]
* The [[Nativity of John the Baptist]] falls on a [[Sunday]]
* The [[Solemnity of Saints Peter and Paul]] falls on a [[Friday]]
* The [[Transfiguration of Jesus]] falls on a [[Monday]]
* The [[Assumption of Mary]] falls on a [[Wednesday]]
* The [[Exaltation of the Holy Cross]] falls on a [[Friday]]
* [[All Saints' Day]] falls on a [[Thursday]]
* [[All Souls' Day]] falls on a [[Friday]]
* The [[Feast of Christ the King]] falls on [[November 25]] (or on [[October 28]] in versions of the calendar between 1925 and 1962)
* The [[First Sunday of Advent]] falls on [[December 2]]
* The [[Immaculate Conception]] falls on a [[Saturday]]
* [[Gaudete Sunday]] falls on [[December 16]]
* [[Rorate Sunday]] falls on [[December 23]]

=== Australia and New Zealand ===
* [[Australia Day]] falls on a [[Friday]]
* [[Waitangi Day]] falls on a [[Tuesday]]
* [[Daylight saving]] ends on its earliest possible date, [[April 1]]
* [[ANZAC Day]] falls on a [[Wednesday]]
* [[Mother's Day]] falls on [[May 13]]
* [[Father's Day]] falls on [[September 2]]
* Daylight saving begins on its latest possible date, [[September 30]] in New Zealand and [[October 7]] in Australia – this is the only common year where the period of standard time over the winter months lasts 26 weeks in New Zealand and 27 weeks in Australia (in all other common years, it lasts only 25 weeks in New Zealand and 26 weeks in Australia)

=== British Isles ===
* [[Saint David's Day]] falls on a [[Thursday]]
* [[Mother's Day]] falls on [[March 4]], [[March 11]], [[March 18]], [[March 25]] or [[April 1]]
* [[Saint Patrick's Day]] falls on a [[Saturday]]
* [[Daylight saving]] begins on its earliest possible date, [[March 25]]. This is the only year when First Sunday of Advent of the year preceding this type of year and start of daylight saving time are 16 weeks (112 days) apart, they are 17 weeks (119 days) apart in all other years.
* [[Saint George's Day]] falls on a [[Monday]]
* [[Father's Day]] falls on [[June 17]]
* [[Orangeman's Day]] falls on a [[Thursday]]
* Daylight saving ends on [[October 28]]
* [[Guy Fawkes Night]] falls on a [[Monday]]
* [[Saint Andrew's Day]] falls on a [[Friday]]

=== Canada ===
* [[Daylight saving]] begins on [[March 11]]
* [[Mother's Day]] falls on [[May 13]]
* [[Victoria Day]] falls on [[May 21]]
* [[Father's Day]] falls on [[June 17]]
* [[Canada Day]] falls on a [[Sunday]]
* [[Labour Day (Canada)|Labour Day]] falls on [[September 3]]
* [[Thanksgiving Day (Canada)|Thanksgiving Day]] falls on its earliest possible date, [[October 8]]
* Daylight saving ends on [[November 4]]

=== United States ===
* [[Martin Luther King Jr. Day]] falls on its earliest possible date, [[January 15]]
* [[President's Day]] falls on [[February 19]]
* [[Daylight saving]] begins on [[March 11]]
* [[Mother's Day]] falls on [[May 13]]
* [[Memorial Day]] falls on [[May 28]]
* [[Father's Day]] falls on [[June 17]]
* [[Juneteenth]] falls on a [[Tuesday]]
* [[Independence Day (United States)|Independence Day]] falls on a [[Wednesday]]
* [[Labor Day (United States)|Labor Day]] falls on [[September 3]]
* [[Grandparents' Day]] falls on [[September 9]]
* [[Columbus Day]] falls on its earliest possible date, [[October 8]]
* Daylight saving ends on [[November 4]]
* [[Thanksgiving Day]] falls on its earliest possible date, [[November 22]]

== References ==
{{Reflist}}
{{List of calendars}}

{{DEFAULTSORT:Common Year Starting On Monday}}
[[Category:Gregorian calendar]]
[[Category:Julian calendar]]
[[Category:Monday]]