Day Numbers for 1980

This page lists all days in 1980 with day and week numbers.
The year 1980 has 366 days. This is a leap year.

DateDay number Days remaining Days from today (Tuesday 17th) Week number
January 1, 1980 (Tue)Day 1365-13531Week 1
January 2, 1980 (Wed)Day 2364-13530Week 1
January 3, 1980 (Thu)Day 3363-13529Week 1
January 4, 1980 (Fri)Day 4362-13528Week 1
January 5, 1980 (Sat)Day 5361-13527Week 1
January 6, 1980 (Sun)Day 6360-13526Week 1
January 7, 1980 (Mon)Day 7359-13525Week 2
January 8, 1980 (Tue)Day 8358-13524Week 2
January 9, 1980 (Wed)Day 9357-13523Week 2
January 10, 1980 (Thu)Day 10356-13522Week 2
January 11, 1980 (Fri)Day 11355-13521Week 2
January 12, 1980 (Sat)Day 12354-13520Week 2
January 13, 1980 (Sun)Day 13353-13519Week 2
January 14, 1980 (Mon)Day 14352-13518Week 3
January 15, 1980 (Tue)Day 15351-13517Week 3
January 16, 1980 (Wed)Day 16350-13516Week 3
January 17, 1980 (Thu)Day 17349-13515Week 3
January 18, 1980 (Fri)Day 18348-13514Week 3
January 19, 1980 (Sat)Day 19347-13513Week 3
January 20, 1980 (Sun)Day 20346-13512Week 3
January 21, 1980 (Mon)Day 21345-13511Week 4
January 22, 1980 (Tue)Day 22344-13510Week 4
January 23, 1980 (Wed)Day 23343-13509Week 4
January 24, 1980 (Thu)Day 24342-13508Week 4
January 25, 1980 (Fri)Day 25341-13507Week 4
January 26, 1980 (Sat)Day 26340-13506Week 4
January 27, 1980 (Sun)Day 27339-13505Week 4
January 28, 1980 (Mon)Day 28338-13504Week 5
January 29, 1980 (Tue)Day 29337-13503Week 5
January 30, 1980 (Wed)Day 30336-13502Week 5
January 31, 1980 (Thu)Day 31335-13501Week 5
February 1, 1980 (Fri)Day 32334-13500Week 5
February 2, 1980 (Sat)Day 33333-13499Week 5
February 3, 1980 (Sun)Day 34332-13498Week 5
February 4, 1980 (Mon)Day 35331-13497Week 6
February 5, 1980 (Tue)Day 36330-13496Week 6
February 6, 1980 (Wed)Day 37329-13495Week 6
February 7, 1980 (Thu)Day 38328-13494Week 6
February 8, 1980 (Fri)Day 39327-13493Week 6
February 9, 1980 (Sat)Day 40326-13492Week 6
February 10, 1980 (Sun)Day 41325-13491Week 6
February 11, 1980 (Mon)Day 42324-13490Week 7
February 12, 1980 (Tue)Day 43323-13489Week 7
February 13, 1980 (Wed)Day 44322-13488Week 7
February 14, 1980 (Thu)Day 45321-13487Week 7
February 15, 1980 (Fri)Day 46320-13486Week 7
February 16, 1980 (Sat)Day 47319-13485Week 7
February 17, 1980 (Sun)Day 48318-13484Week 7
February 18, 1980 (Mon)Day 49317-13483Week 8
February 19, 1980 (Tue)Day 50316-13482Week 8
February 20, 1980 (Wed)Day 51315-13481Week 8
February 21, 1980 (Thu)Day 52314-13480Week 8
February 22, 1980 (Fri)Day 53313-13479Week 8
February 23, 1980 (Sat)Day 54312-13478Week 8
February 24, 1980 (Sun)Day 55311-13477Week 8
February 25, 1980 (Mon)Day 56310-13476Week 9
February 26, 1980 (Tue)Day 57309-13475Week 9
February 27, 1980 (Wed)Day 58308-13474Week 9
February 28, 1980 (Thu)Day 59307-13473Week 9
February 29, 1980 (Fri)Day 60306-13472Week 9
March 1, 1980 (Sat)Day 61305-13471Week 9
March 2, 1980 (Sun)Day 62304-13470Week 9
March 3, 1980 (Mon)Day 63303-13469Week 10
March 4, 1980 (Tue)Day 64302-13468Week 10
March 5, 1980 (Wed)Day 65301-13467Week 10
March 6, 1980 (Thu)Day 66300-13466Week 10
March 7, 1980 (Fri)Day 67299-13465Week 10
March 8, 1980 (Sat)Day 68298-13464Week 10
March 9, 1980 (Sun)Day 69297-13463Week 10
March 10, 1980 (Mon)Day 70296-13462Week 11
March 11, 1980 (Tue)Day 71295-13461Week 11
March 12, 1980 (Wed)Day 72294-13460Week 11
March 13, 1980 (Thu)Day 73293-13459Week 11
March 14, 1980 (Fri)Day 74292-13458Week 11
March 15, 1980 (Sat)Day 75291-13457Week 11
March 16, 1980 (Sun)Day 76290-13456Week 11
March 17, 1980 (Mon)Day 77289-13455Week 12
March 18, 1980 (Tue)Day 78288-13454Week 12
March 19, 1980 (Wed)Day 79287-13453Week 12
March 20, 1980 (Thu)Day 80286-13452Week 12
March 21, 1980 (Fri)Day 81285-13451Week 12
March 22, 1980 (Sat)Day 82284-13450Week 12
March 23, 1980 (Sun)Day 83283-13449Week 12
March 24, 1980 (Mon)Day 84282-13448Week 13
March 25, 1980 (Tue)Day 85281-13447Week 13
March 26, 1980 (Wed)Day 86280-13446Week 13
March 27, 1980 (Thu)Day 87279-13445Week 13
March 28, 1980 (Fri)Day 88278-13444Week 13
March 29, 1980 (Sat)Day 89277-13443Week 13
March 30, 1980 (Sun)Day 90276-13442Week 13
March 31, 1980 (Mon)Day 91275-13441Week 14
April 1, 1980 (Tue)Day 92274-13440Week 14
April 2, 1980 (Wed)Day 93273-13439Week 14
April 3, 1980 (Thu)Day 94272-13438Week 14
April 4, 1980 (Fri)Day 95271-13437Week 14
April 5, 1980 (Sat)Day 96270-13436Week 14
April 6, 1980 (Sun)Day 97269-13435Week 14
April 7, 1980 (Mon)Day 98268-13434Week 15
April 8, 1980 (Tue)Day 99267-13433Week 15
April 9, 1980 (Wed)Day 100266-13432Week 15
April 10, 1980 (Thu)Day 101265-13431Week 15
April 11, 1980 (Fri)Day 102264-13430Week 15
April 12, 1980 (Sat)Day 103263-13429Week 15
April 13, 1980 (Sun)Day 104262-13428Week 15
April 14, 1980 (Mon)Day 105261-13427Week 16
April 15, 1980 (Tue)Day 106260-13426Week 16
April 16, 1980 (Wed)Day 107259-13425Week 16
April 17, 1980 (Thu)Day 108258-13424Week 16
April 18, 1980 (Fri)Day 109257-13423Week 16
April 19, 1980 (Sat)Day 110256-13422Week 16
April 20, 1980 (Sun)Day 111255-13421Week 16
April 21, 1980 (Mon)Day 112254-13420Week 17
April 22, 1980 (Tue)Day 113253-13419Week 17
April 23, 1980 (Wed)Day 114252-13418Week 17
April 24, 1980 (Thu)Day 115251-13417Week 17
April 25, 1980 (Fri)Day 116250-13416Week 17
April 26, 1980 (Sat)Day 117249-13415Week 17
April 27, 1980 (Sun)Day 118248-13414Week 17
April 28, 1980 (Mon)Day 119247-13413Week 18
April 29, 1980 (Tue)Day 120246-13412Week 18
April 30, 1980 (Wed)Day 121245-13411Week 18
May 1, 1980 (Thu)Day 122244-13410Week 18
May 2, 1980 (Fri)Day 123243-13409Week 18
May 3, 1980 (Sat)Day 124242-13408Week 18
May 4, 1980 (Sun)Day 125241-13407Week 18
May 5, 1980 (Mon)Day 126240-13406Week 19
May 6, 1980 (Tue)Day 127239-13405Week 19
May 7, 1980 (Wed)Day 128238-13404Week 19
May 8, 1980 (Thu)Day 129237-13403Week 19
May 9, 1980 (Fri)Day 130236-13402Week 19
May 10, 1980 (Sat)Day 131235-13401Week 19
May 11, 1980 (Sun)Day 132234-13400Week 19
May 12, 1980 (Mon)Day 133233-13399Week 20
May 13, 1980 (Tue)Day 134232-13398Week 20
May 14, 1980 (Wed)Day 135231-13397Week 20
May 15, 1980 (Thu)Day 136230-13396Week 20
May 16, 1980 (Fri)Day 137229-13395Week 20
May 17, 1980 (Sat)Day 138228-13394Week 20
May 18, 1980 (Sun)Day 139227-13393Week 20
May 19, 1980 (Mon)Day 140226-13392Week 21
May 20, 1980 (Tue)Day 141225-13391Week 21
May 21, 1980 (Wed)Day 142224-13390Week 21
May 22, 1980 (Thu)Day 143223-13389Week 21
May 23, 1980 (Fri)Day 144222-13388Week 21
May 24, 1980 (Sat)Day 145221-13387Week 21
May 25, 1980 (Sun)Day 146220-13386Week 21
May 26, 1980 (Mon)Day 147219-13385Week 22
May 27, 1980 (Tue)Day 148218-13384Week 22
May 28, 1980 (Wed)Day 149217-13383Week 22
May 29, 1980 (Thu)Day 150216-13382Week 22
May 30, 1980 (Fri)Day 151215-13381Week 22
May 31, 1980 (Sat)Day 152214-13380Week 22
June 1, 1980 (Sun)Day 153213-13379Week 22
June 2, 1980 (Mon)Day 154212-13378Week 23
June 3, 1980 (Tue)Day 155211-13377Week 23
June 4, 1980 (Wed)Day 156210-13376Week 23
June 5, 1980 (Thu)Day 157209-13375Week 23
June 6, 1980 (Fri)Day 158208-13374Week 23
June 7, 1980 (Sat)Day 159207-13373Week 23
June 8, 1980 (Sun)Day 160206-13372Week 23
June 9, 1980 (Mon)Day 161205-13371Week 24
June 10, 1980 (Tue)Day 162204-13370Week 24
June 11, 1980 (Wed)Day 163203-13369Week 24
June 12, 1980 (Thu)Day 164202-13368Week 24
June 13, 1980 (Fri)Day 165201-13367Week 24
June 14, 1980 (Sat)Day 166200-13366Week 24
June 15, 1980 (Sun)Day 167199-13365Week 24
June 16, 1980 (Mon)Day 168198-13364Week 25
June 17, 1980 (Tue)Day 169197-13363Week 25
June 18, 1980 (Wed)Day 170196-13362Week 25
June 19, 1980 (Thu)Day 171195-13361Week 25
June 20, 1980 (Fri)Day 172194-13360Week 25
June 21, 1980 (Sat)Day 173193-13359Week 25
June 22, 1980 (Sun)Day 174192-13358Week 25
June 23, 1980 (Mon)Day 175191-13357Week 26
June 24, 1980 (Tue)Day 176190-13356Week 26
June 25, 1980 (Wed)Day 177189-13355Week 26
June 26, 1980 (Thu)Day 178188-13354Week 26
June 27, 1980 (Fri)Day 179187-13353Week 26
June 28, 1980 (Sat)Day 180186-13352Week 26
June 29, 1980 (Sun)Day 181185-13351Week 26
June 30, 1980 (Mon)Day 182184-13350Week 27
July 1, 1980 (Tue)Day 183183-13349Week 27
July 2, 1980 (Wed)Day 184182-13348Week 27
July 3, 1980 (Thu)Day 185181-13347Week 27
July 4, 1980 (Fri)Day 186180-13346Week 27
July 5, 1980 (Sat)Day 187179-13345Week 27
July 6, 1980 (Sun)Day 188178-13344Week 27
July 7, 1980 (Mon)Day 189177-13343Week 28
July 8, 1980 (Tue)Day 190176-13342Week 28
July 9, 1980 (Wed)Day 191175-13341Week 28
July 10, 1980 (Thu)Day 192174-13340Week 28
July 11, 1980 (Fri)Day 193173-13339Week 28
July 12, 1980 (Sat)Day 194172-13338Week 28
July 13, 1980 (Sun)Day 195171-13337Week 28
July 14, 1980 (Mon)Day 196170-13336Week 29
July 15, 1980 (Tue)Day 197169-13335Week 29
July 16, 1980 (Wed)Day 198168-13334Week 29
July 17, 1980 (Thu)Day 199167-13333Week 29
July 18, 1980 (Fri)Day 200166-13332Week 29
July 19, 1980 (Sat)Day 201165-13331Week 29
July 20, 1980 (Sun)Day 202164-13330Week 29
July 21, 1980 (Mon)Day 203163-13329Week 30
July 22, 1980 (Tue)Day 204162-13328Week 30
July 23, 1980 (Wed)Day 205161-13327Week 30
July 24, 1980 (Thu)Day 206160-13326Week 30
July 25, 1980 (Fri)Day 207159-13325Week 30
July 26, 1980 (Sat)Day 208158-13324Week 30
July 27, 1980 (Sun)Day 209157-13323Week 30
July 28, 1980 (Mon)Day 210156-13322Week 31
July 29, 1980 (Tue)Day 211155-13321Week 31
July 30, 1980 (Wed)Day 212154-13320Week 31
July 31, 1980 (Thu)Day 213153-13319Week 31
August 1, 1980 (Fri)Day 214152-13318Week 31
August 2, 1980 (Sat)Day 215151-13317Week 31
August 3, 1980 (Sun)Day 216150-13316Week 31
August 4, 1980 (Mon)Day 217149-13315Week 32
August 5, 1980 (Tue)Day 218148-13314Week 32
August 6, 1980 (Wed)Day 219147-13313Week 32
August 7, 1980 (Thu)Day 220146-13312Week 32
August 8, 1980 (Fri)Day 221145-13311Week 32
August 9, 1980 (Sat)Day 222144-13310Week 32
August 10, 1980 (Sun)Day 223143-13309Week 32
August 11, 1980 (Mon)Day 224142-13308Week 33
August 12, 1980 (Tue)Day 225141-13307Week 33
August 13, 1980 (Wed)Day 226140-13306Week 33
August 14, 1980 (Thu)Day 227139-13305Week 33
August 15, 1980 (Fri)Day 228138-13304Week 33
August 16, 1980 (Sat)Day 229137-13303Week 33
August 17, 1980 (Sun)Day 230136-13302Week 33
August 18, 1980 (Mon)Day 231135-13301Week 34
August 19, 1980 (Tue)Day 232134-13300Week 34
August 20, 1980 (Wed)Day 233133-13299Week 34
August 21, 1980 (Thu)Day 234132-13298Week 34
August 22, 1980 (Fri)Day 235131-13297Week 34
August 23, 1980 (Sat)Day 236130-13296Week 34
August 24, 1980 (Sun)Day 237129-13295Week 34
August 25, 1980 (Mon)Day 238128-13294Week 35
August 26, 1980 (Tue)Day 239127-13293Week 35
August 27, 1980 (Wed)Day 240126-13292Week 35
August 28, 1980 (Thu)Day 241125-13291Week 35
August 29, 1980 (Fri)Day 242124-13290Week 35
August 30, 1980 (Sat)Day 243123-13289Week 35
August 31, 1980 (Sun)Day 244122-13288Week 35
September 1, 1980 (Mon)Day 245121-13287Week 36
September 2, 1980 (Tue)Day 246120-13286Week 36
September 3, 1980 (Wed)Day 247119-13285Week 36
September 4, 1980 (Thu)Day 248118-13284Week 36
September 5, 1980 (Fri)Day 249117-13283Week 36
September 6, 1980 (Sat)Day 250116-13282Week 36
September 7, 1980 (Sun)Day 251115-13281Week 36
September 8, 1980 (Mon)Day 252114-13280Week 37
September 9, 1980 (Tue)Day 253113-13279Week 37
September 10, 1980 (Wed)Day 254112-13278Week 37
September 11, 1980 (Thu)Day 255111-13277Week 37
September 12, 1980 (Fri)Day 256110-13276Week 37
September 13, 1980 (Sat)Day 257109-13275Week 37
September 14, 1980 (Sun)Day 258108-13274Week 37
September 15, 1980 (Mon)Day 259107-13273Week 38
September 16, 1980 (Tue)Day 260106-13272Week 38
September 17, 1980 (Wed)Day 261105-13271Week 38
September 18, 1980 (Thu)Day 262104-13270Week 38
September 19, 1980 (Fri)Day 263103-13269Week 38
September 20, 1980 (Sat)Day 264102-13268Week 38
September 21, 1980 (Sun)Day 265101-13267Week 38
September 22, 1980 (Mon)Day 266100-13266Week 39
September 23, 1980 (Tue)Day 26799-13265Week 39
September 24, 1980 (Wed)Day 26898-13264Week 39
September 25, 1980 (Thu)Day 26997-13263Week 39
September 26, 1980 (Fri)Day 27096-13262Week 39
September 27, 1980 (Sat)Day 27195-13261Week 39
September 28, 1980 (Sun)Day 27294-13260Week 39
September 29, 1980 (Mon)Day 27393-13259Week 40
September 30, 1980 (Tue)Day 27492-13258Week 40
October 1, 1980 (Wed)Day 27591-13257Week 40
October 2, 1980 (Thu)Day 27690-13256Week 40
October 3, 1980 (Fri)Day 27789-13255Week 40
October 4, 1980 (Sat)Day 27888-13254Week 40
October 5, 1980 (Sun)Day 27987-13253Week 40
October 6, 1980 (Mon)Day 28086-13252Week 41
October 7, 1980 (Tue)Day 28185-13251Week 41
October 8, 1980 (Wed)Day 28284-13250Week 41
October 9, 1980 (Thu)Day 28383-13249Week 41
October 10, 1980 (Fri)Day 28482-13248Week 41
October 11, 1980 (Sat)Day 28581-13247Week 41
October 12, 1980 (Sun)Day 28680-13246Week 41
October 13, 1980 (Mon)Day 28779-13245Week 42
October 14, 1980 (Tue)Day 28878-13244Week 42
October 15, 1980 (Wed)Day 28977-13243Week 42
October 16, 1980 (Thu)Day 29076-13242Week 42
October 17, 1980 (Fri)Day 29175-13241Week 42
October 18, 1980 (Sat)Day 29274-13240Week 42
October 19, 1980 (Sun)Day 29373-13239Week 42
October 20, 1980 (Mon)Day 29472-13238Week 43
October 21, 1980 (Tue)Day 29571-13237Week 43
October 22, 1980 (Wed)Day 29670-13236Week 43
October 23, 1980 (Thu)Day 29769-13235Week 43
October 24, 1980 (Fri)Day 29868-13234Week 43
October 25, 1980 (Sat)Day 29967-13233Week 43
October 26, 1980 (Sun)Day 30066-13232Week 43
October 27, 1980 (Mon)Day 30165-13231Week 44
October 28, 1980 (Tue)Day 30264-13230Week 44
October 29, 1980 (Wed)Day 30363-13229Week 44
October 30, 1980 (Thu)Day 30462-13228Week 44
October 31, 1980 (Fri)Day 30561-13227Week 44
November 1, 1980 (Sat)Day 30660-13226Week 44
November 2, 1980 (Sun)Day 30759-13225Week 44
November 3, 1980 (Mon)Day 30858-13224Week 45
November 4, 1980 (Tue)Day 30957-13223Week 45
November 5, 1980 (Wed)Day 31056-13222Week 45
November 6, 1980 (Thu)Day 31155-13221Week 45
November 7, 1980 (Fri)Day 31254-13220Week 45
November 8, 1980 (Sat)Day 31353-13219Week 45
November 9, 1980 (Sun)Day 31452-13218Week 45
November 10, 1980 (Mon)Day 31551-13217Week 46
November 11, 1980 (Tue)Day 31650-13216Week 46
November 12, 1980 (Wed)Day 31749-13215Week 46
November 13, 1980 (Thu)Day 31848-13214Week 46
November 14, 1980 (Fri)Day 31947-13213Week 46
November 15, 1980 (Sat)Day 32046-13212Week 46
November 16, 1980 (Sun)Day 32145-13211Week 46
November 17, 1980 (Mon)Day 32244-13210Week 47
November 18, 1980 (Tue)Day 32343-13209Week 47
November 19, 1980 (Wed)Day 32442-13208Week 47
November 20, 1980 (Thu)Day 32541-13207Week 47
November 21, 1980 (Fri)Day 32640-13206Week 47
November 22, 1980 (Sat)Day 32739-13205Week 47
November 23, 1980 (Sun)Day 32838-13204Week 47
November 24, 1980 (Mon)Day 32937-13203Week 48
November 25, 1980 (Tue)Day 33036-13202Week 48
November 26, 1980 (Wed)Day 33135-13201Week 48
November 27, 1980 (Thu)Day 33234-13200Week 48
November 28, 1980 (Fri)Day 33333-13199Week 48
November 29, 1980 (Sat)Day 33432-13198Week 48
November 30, 1980 (Sun)Day 33531-13197Week 48
December 1, 1980 (Mon)Day 33630-13196Week 49
December 2, 1980 (Tue)Day 33729-13195Week 49
December 3, 1980 (Wed)Day 33828-13194Week 49
December 4, 1980 (Thu)Day 33927-13193Week 49
December 5, 1980 (Fri)Day 34026-13192Week 49
December 6, 1980 (Sat)Day 34125-13191Week 49
December 7, 1980 (Sun)Day 34224-13190Week 49
December 8, 1980 (Mon)Day 34323-13189Week 50
December 9, 1980 (Tue)Day 34422-13188Week 50
December 10, 1980 (Wed)Day 34521-13187Week 50
December 11, 1980 (Thu)Day 34620-13186Week 50
December 12, 1980 (Fri)Day 34719-13185Week 50
December 13, 1980 (Sat)Day 34818-13184Week 50
December 14, 1980 (Sun)Day 34917-13183Week 50
December 15, 1980 (Mon)Day 35016-13182Week 51
December 16, 1980 (Tue)Day 35115-13181Week 51
December 17, 1980 (Wed)Day 35214-13180Week 51
December 18, 1980 (Thu)Day 35313-13179Week 51
December 19, 1980 (Fri)Day 35412-13178Week 51
December 20, 1980 (Sat)Day 35511-13177Week 51
December 21, 1980 (Sun)Day 35610-13176Week 51
December 22, 1980 (Mon)Day 3579-13175Week 52
December 23, 1980 (Tue)Day 3588-13174Week 52
December 24, 1980 (Wed)Day 3597-13173Week 52
December 25, 1980 (Thu)Day 3606-13172Week 52
December 26, 1980 (Fri)Day 3615-13171Week 52
December 27, 1980 (Sat)Day 3624-13170Week 52
December 28, 1980 (Sun)Day 3633-13169Week 52
December 29, 1980 (Mon)Day 3642-13168Week 1, 1981
December 30, 1980 (Tue)Day 3651-13167Week 1, 1981
December 31, 1980 (Wed)Day 3660-13166Week 1, 1981

Other years: 1920 | 1921 | 1922 | 1923 | 1924 | 1925 | 1926 | 1927 | 1928 | 1929 | 1930 | 1931 | 1932 | 1933 | 1934 | 1935 | 1936 | 1937 | 1938 | 1939 | 1940 | 1941 | 1942 | 1943 | 1944 | 1945 | 1946 | 1947 | 1948 | 1949 | 1950 | 1951 | 1952 | 1953 | 1954 | 1955 | 1956 | 1957 | 1958 | 1959 | 1960 | 1961 | 1962 | 1963 | 1964 | 1965 | 1966 | 1967 | 1968 | 1969 | 1970 | 1971 | 1972 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 | 2031 | 2032 | 2033 | 2034 | 2035 | 2036 | 2037 | 2038 | 2039 | 2040

Also see: Week numbers for 1980

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Date and Time
Week numbers
Weeks by year
Day numbers
Days by year
Years/leap years
Calculate difference
   between two dates


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