我想要一個物件，它可以為我提供從 1990-01-01 到 2021-12-31 的每個月（或每個季度）的日期范圍，用冒號分隔。例如，在每月的情況下，第一個物件是 1990-01-01:1990-01-31，第二個物件是 1990-02-01:1990-02-31，依此類推。
我遇到的問題是確保日期范圍是獨占的，即沒有日期重復。
start_date1 <- as.Date("1990-01-01", "%Y-%m-%d")
end_date1 <- as.Date("2021-12-01", "%Y-%m-%d")
first_date <- format(seq(start_date1,end_date1,by="month"),"%Y-%m-%d")
start_date2 <- as.Date("1990-02-01", "%Y-%m-%d")
end_date2 <- as.Date("2022-01-01", "%Y-%m-%d")
second_date <- format(seq(start_date2,end_date2,by="month"),"%Y-%m-%d")
date<-paste0(first_date, ":")
finaldate<-paste0(date, second_date)
此代碼有效，除了每個月的第一個日期重復“1990-01-01:1990-02-01”“1990-02-01:1990-03-01”，最后一個日期是“2021- 12-01:2022-01-01"（包括 2022 年 1 月 1 日，而不是在 2021 年 12 月 31 日停止。
如果我改為 30 天，它就不會那么好用，因為不是每個月都有 30 天。
獲得獨家日期范圍的最佳方式是什么？先感謝您！
uj5u.com熱心網友回復：
你可以這樣做：
dates <- seq(as.Date("1990-01-01"), as.Date("2022-01-01"), by = "month")
dates <- paste(head(dates, -1), tail(dates-1, - 1), sep = ":")
導致：
dates
#> [1] "1990-01-01:1990-01-31" "1990-02-01:1990-02-28" "1990-03-01:1990-03-31"
#> [4] "1990-04-01:1990-04-30" "1990-05-01:1990-05-31" "1990-06-01:1990-06-30"
#> [7] "1990-07-01:1990-07-31" "1990-08-01:1990-08-31" "1990-09-01:1990-09-30"
#> [10] "1990-10-01:1990-10-31" "1990-11-01:1990-11-30" "1990-12-01:1990-12-31"
#> [13] "1991-01-01:1991-01-31" "1991-02-01:1991-02-28" "1991-03-01:1991-03-31"
#> [16] "1991-04-01:1991-04-30" "1991-05-01:1991-05-31" "1991-06-01:1991-06-30"
#> [19] "1991-07-01:1991-07-31" "1991-08-01:1991-08-31" "1991-09-01:1991-09-30"
#> [22] "1991-10-01:1991-10-31" "1991-11-01:1991-11-30" "1991-12-01:1991-12-31"
#> [25] "1992-01-01:1992-01-31" "1992-02-01:1992-02-29" "1992-03-01:1992-03-31"
#> [28] "1992-04-01:1992-04-30" "1992-05-01:1992-05-31" "1992-06-01:1992-06-30"
#> [31] "1992-07-01:1992-07-31" "1992-08-01:1992-08-31" "1992-09-01:1992-09-30"
#> [34] "1992-10-01:1992-10-31" "1992-11-01:1992-11-30" "1992-12-01:1992-12-31"
#> [37] "1993-01-01:1993-01-31" "1993-02-01:1993-02-28" "1993-03-01:1993-03-31"
#> [40] "1993-04-01:1993-04-30" "1993-05-01:1993-05-31" "1993-06-01:1993-06-30"
#> [43] "1993-07-01:1993-07-31" "1993-08-01:1993-08-31" "1993-09-01:1993-09-30"
#> [46] "1993-10-01:1993-10-31" "1993-11-01:1993-11-30" "1993-12-01:1993-12-31"
#> [49] "1994-01-01:1994-01-31" "1994-02-01:1994-02-28" "1994-03-01:1994-03-31"
#> [52] "1994-04-01:1994-04-30" "1994-05-01:1994-05-31" "1994-06-01:1994-06-30"
#> [55] "1994-07-01:1994-07-31" "1994-08-01:1994-08-31" "1994-09-01:1994-09-30"
#> [58] "1994-10-01:1994-10-31" "1994-11-01:1994-11-30" "1994-12-01:1994-12-31"
#> [61] "1995-01-01:1995-01-31" "1995-02-01:1995-02-28" "1995-03-01:1995-03-31"
#> [64] "1995-04-01:1995-04-30" "1995-05-01:1995-05-31" "1995-06-01:1995-06-30"
#> [67] "1995-07-01:1995-07-31" "1995-08-01:1995-08-31" "1995-09-01:1995-09-30"
#> [70] "1995-10-01:1995-10-31" "1995-11-01:1995-11-30" "1995-12-01:1995-12-31"
#> [73] "1996-01-01:1996-01-31" "1996-02-01:1996-02-29" "1996-03-01:1996-03-31"
#> [76] "1996-04-01:1996-04-30" "1996-05-01:1996-05-31" "1996-06-01:1996-06-30"
#> [79] "1996-07-01:1996-07-31" "1996-08-01:1996-08-31" "1996-09-01:1996-09-30"
#> [82] "1996-10-01:1996-10-31" "1996-11-01:1996-11-30" "1996-12-01:1996-12-31"
#> [85] "1997-01-01:1997-01-31" "1997-02-01:1997-02-28" "1997-03-01:1997-03-31"
#> [88] "1997-04-01:1997-04-30" "1997-05-01:1997-05-31" "1997-06-01:1997-06-30"
#> [91] "1997-07-01:1997-07-31" "1997-08-01:1997-08-31" "1997-09-01:1997-09-30"
#> [94] "1997-10-01:1997-10-31" "1997-11-01:1997-11-30" "1997-12-01:1997-12-31"
#> [97] "1998-01-01:1998-01-31" "1998-02-01:1998-02-28" "1998-03-01:1998-03-31"
#> [100] "1998-04-01:1998-04-30" "1998-05-01:1998-05-31" "1998-06-01:1998-06-30"
#> [103] "1998-07-01:1998-07-31" "1998-08-01:1998-08-31" "1998-09-01:1998-09-30"
#> [106] "1998-10-01:1998-10-31" "1998-11-01:1998-11-30" "1998-12-01:1998-12-31"
#> [109] "1999-01-01:1999-01-31" "1999-02-01:1999-02-28" "1999-03-01:1999-03-31"
#> [112] "1999-04-01:1999-04-30" "1999-05-01:1999-05-31" "1999-06-01:1999-06-30"
#> [115] "1999-07-01:1999-07-31" "1999-08-01:1999-08-31" "1999-09-01:1999-09-30"
#> [118] "1999-10-01:1999-10-31" "1999-11-01:1999-11-30" "1999-12-01:1999-12-31"
#> [121] "2000-01-01:2000-01-31" "2000-02-01:2000-02-29" "2000-03-01:2000-03-31"
#> [124] "2000-04-01:2000-04-30" "2000-05-01:2000-05-31" "2000-06-01:2000-06-30"
#> [127] "2000-07-01:2000-07-31" "2000-08-01:2000-08-31" "2000-09-01:2000-09-30"
#> [130] "2000-10-01:2000-10-31" "2000-11-01:2000-11-30" "2000-12-01:2000-12-31"
#> [133] "2001-01-01:2001-01-31" "2001-02-01:2001-02-28" "2001-03-01:2001-03-31"
#> [136] "2001-04-01:2001-04-30" "2001-05-01:2001-05-31" "2001-06-01:2001-06-30"
#> [139] "2001-07-01:2001-07-31" "2001-08-01:2001-08-31" "2001-09-01:2001-09-30"
#> [142] "2001-10-01:2001-10-31" "2001-11-01:2001-11-30" "2001-12-01:2001-12-31"
#> [145] "2002-01-01:2002-01-31" "2002-02-01:2002-02-28" "2002-03-01:2002-03-31"
#> [148] "2002-04-01:2002-04-30" "2002-05-01:2002-05-31" "2002-06-01:2002-06-30"
#> [151] "2002-07-01:2002-07-31" "2002-08-01:2002-08-31" "2002-09-01:2002-09-30"
#> [154] "2002-10-01:2002-10-31" "2002-11-01:2002-11-30" "2002-12-01:2002-12-31"
#> [157] "2003-01-01:2003-01-31" "2003-02-01:2003-02-28" "2003-03-01:2003-03-31"
#> [160] "2003-04-01:2003-04-30" "2003-05-01:2003-05-31" "2003-06-01:2003-06-30"
#> [163] "2003-07-01:2003-07-31" "2003-08-01:2003-08-31" "2003-09-01:2003-09-30"
#> [166] "2003-10-01:2003-10-31" "2003-11-01:2003-11-30" "2003-12-01:2003-12-31"
#> [169] "2004-01-01:2004-01-31" "2004-02-01:2004-02-29" "2004-03-01:2004-03-31"
#> [172] "2004-04-01:2004-04-30" "2004-05-01:2004-05-31" "2004-06-01:2004-06-30"
#> [175] "2004-07-01:2004-07-31" "2004-08-01:2004-08-31" "2004-09-01:2004-09-30"
#> [178] "2004-10-01:2004-10-31" "2004-11-01:2004-11-30" "2004-12-01:2004-12-31"
#> [181] "2005-01-01:2005-01-31" "2005-02-01:2005-02-28" "2005-03-01:2005-03-31"
#> [184] "2005-04-01:2005-04-30" "2005-05-01:2005-05-31" "2005-06-01:2005-06-30"
#> [187] "2005-07-01:2005-07-31" "2005-08-01:2005-08-31" "2005-09-01:2005-09-30"
#> [190] "2005-10-01:2005-10-31" "2005-11-01:2005-11-30" "2005-12-01:2005-12-31"
#> [193] "2006-01-01:2006-01-31" "2006-02-01:2006-02-28" "2006-03-01:2006-03-31"
#> [196] "2006-04-01:2006-04-30" "2006-05-01:2006-05-31" "2006-06-01:2006-06-30"
#> [199] "2006-07-01:2006-07-31" "2006-08-01:2006-08-31" "2006-09-01:2006-09-30"
#> [202] "2006-10-01:2006-10-31" "2006-11-01:2006-11-30" "2006-12-01:2006-12-31"
#> [205] "2007-01-01:2007-01-31" "2007-02-01:2007-02-28" "2007-03-01:2007-03-31"
#> [208] "2007-04-01:2007-04-30" "2007-05-01:2007-05-31" "2007-06-01:2007-06-30"
#> [211] "2007-07-01:2007-07-31" "2007-08-01:2007-08-31" "2007-09-01:2007-09-30"
#> [214] "2007-10-01:2007-10-31" "2007-11-01:2007-11-30" "2007-12-01:2007-12-31"
#> [217] "2008-01-01:2008-01-31" "2008-02-01:2008-02-29" "2008-03-01:2008-03-31"
#> [220] "2008-04-01:2008-04-30" "2008-05-01:2008-05-31" "2008-06-01:2008-06-30"
#> [223] "2008-07-01:2008-07-31" "2008-08-01:2008-08-31" "2008-09-01:2008-09-30"
#> [226] "2008-10-01:2008-10-31" "2008-11-01:2008-11-30" "2008-12-01:2008-12-31"
#> [229] "2009-01-01:2009-01-31" "2009-02-01:2009-02-28" "2009-03-01:2009-03-31"
#> [232] "2009-04-01:2009-04-30" "2009-05-01:2009-05-31" "2009-06-01:2009-06-30"
#> [235] "2009-07-01:2009-07-31" "2009-08-01:2009-08-31" "2009-09-01:2009-09-30"
#> [238] "2009-10-01:2009-10-31" "2009-11-01:2009-11-30" "2009-12-01:2009-12-31"
#> [241] "2010-01-01:2010-01-31" "2010-02-01:2010-02-28" "2010-03-01:2010-03-31"
#> [244] "2010-04-01:2010-04-30" "2010-05-01:2010-05-31" "2010-06-01:2010-06-30"
#> [247] "2010-07-01:2010-07-31" "2010-08-01:2010-08-31" "2010-09-01:2010-09-30"
#> [250] "2010-10-01:2010-10-31" "2010-11-01:2010-11-30" "2010-12-01:2010-12-31"
#> [253] "2011-01-01:2011-01-31" "2011-02-01:2011-02-28" "2011-03-01:2011-03-31"
#> [256] "2011-04-01:2011-04-30" "2011-05-01:2011-05-31" "2011-06-01:2011-06-30"
#> [259] "2011-07-01:2011-07-31" "2011-08-01:2011-08-31" "2011-09-01:2011-09-30"
#> [262] "2011-10-01:2011-10-31" "2011-11-01:2011-11-30" "2011-12-01:2011-12-31"
#> [265] "2012-01-01:2012-01-31" "2012-02-01:2012-02-29" "2012-03-01:2012-03-31"
#> [268] "2012-04-01:2012-04-30" "2012-05-01:2012-05-31" "2012-06-01:2012-06-30"
#> [271] "2012-07-01:2012-07-31" "2012-08-01:2012-08-31" "2012-09-01:2012-09-30"
#> [274] "2012-10-01:2012-10-31" "2012-11-01:2012-11-30" "2012-12-01:2012-12-31"
#> [277] "2013-01-01:2013-01-31" "2013-02-01:2013-02-28" "2013-03-01:2013-03-31"
#> [280] "2013-04-01:2013-04-30" "2013-05-01:2013-05-31" "2013-06-01:2013-06-30"
#> [283] "2013-07-01:2013-07-31" "2013-08-01:2013-08-31" "2013-09-01:2013-09-30"
#> [286] "2013-10-01:2013-10-31" "2013-11-01:2013-11-30" "2013-12-01:2013-12-31"
#> [289] "2014-01-01:2014-01-31" "2014-02-01:2014-02-28" "2014-03-01:2014-03-31"
#> [292] "2014-04-01:2014-04-30" "2014-05-01:2014-05-31" "2014-06-01:2014-06-30"
#> [295] "2014-07-01:2014-07-31" "2014-08-01:2014-08-31" "2014-09-01:2014-09-30"
#> [298] "2014-10-01:2014-10-31" "2014-11-01:2014-11-30" "2014-12-01:2014-12-31"
#> [301] "2015-01-01:2015-01-31" "2015-02-01:2015-02-28" "2015-03-01:2015-03-31"
#> [304] "2015-04-01:2015-04-30" "2015-05-01:2015-05-31" "2015-06-01:2015-06-30"
#> [307] "2015-07-01:2015-07-31" "2015-08-01:2015-08-31" "2015-09-01:2015-09-30"
#> [310] "2015-10-01:2015-10-31" "2015-11-01:2015-11-30" "2015-12-01:2015-12-31"
#> [313] "2016-01-01:2016-01-31" "2016-02-01:2016-02-29" "2016-03-01:2016-03-31"
#> [316] "2016-04-01:2016-04-30" "2016-05-01:2016-05-31" "2016-06-01:2016-06-30"
#> [319] "2016-07-01:2016-07-31" "2016-08-01:2016-08-31" "2016-09-01:2016-09-30"
#> [322] "2016-10-01:2016-10-31" "2016-11-01:2016-11-30" "2016-12-01:2016-12-31"
#> [325] "2017-01-01:2017-01-31" "2017-02-01:2017-02-28" "2017-03-01:2017-03-31"
#> [328] "2017-04-01:2017-04-30" "2017-05-01:2017-05-31" "2017-06-01:2017-06-30"
#> [331] "2017-07-01:2017-07-31" "2017-08-01:2017-08-31" "2017-09-01:2017-09-30"
#> [334] "2017-10-01:2017-10-31" "2017-11-01:2017-11-30" "2017-12-01:2017-12-31"
#> [337] "2018-01-01:2018-01-31" "2018-02-01:2018-02-28" "2018-03-01:2018-03-31"
#> [340] "2018-04-01:2018-04-30" "2018-05-01:2018-05-31" "2018-06-01:2018-06-30"
#> [343] "2018-07-01:2018-07-31" "2018-08-01:2018-08-31" "2018-09-01:2018-09-30"
#> [346] "2018-10-01:2018-10-31" "2018-11-01:2018-11-30" "2018-12-01:2018-12-31"
#> [349] "2019-01-01:2019-01-31" "2019-02-01:2019-02-28" "2019-03-01:2019-03-31"
#> [352] "2019-04-01:2019-04-30" "2019-05-01:2019-05-31" "2019-06-01:2019-06-30"
#> [355] "2019-07-01:2019-07-31" "2019-08-01:2019-08-31" "2019-09-01:2019-09-30"
#> [358] "2019-10-01:2019-10-31" "2019-11-01:2019-11-30" "2019-12-01:2019-12-31"
#> [361] "2020-01-01:2020-01-31" "2020-02-01:2020-02-29" "2020-03-01:2020-03-31"
#> [364] "2020-04-01:2020-04-30" "2020-05-01:2020-05-31" "2020-06-01:2020-06-30"
#> [367] "2020-07-01:2020-07-31" "2020-08-01:2020-08-31" "2020-09-01:2020-09-30"
#> [370] "2020-10-01:2020-10-31" "2020-11-01:2020-11-30" "2020-12-01:2020-12-31"
#> [373] "2021-01-01:2021-01-31" "2021-02-01:2021-02-28" "2021-03-01:2021-03-31"
#> [376] "2021-04-01:2021-04-30" "2021-05-01:2021-05-31" "2021-06-01:2021-06-30"
#> [379] "2021-07-01:2021-07-31" "2021-08-01:2021-08-31" "2021-09-01:2021-09-30"
#> [382] "2021-10-01:2021-10-31" "2021-11-01:2021-11-30" "2021-12-01:2021-12-31"
由reprex 包于 2022-03-19 創建(v2.0.1)
uj5u.com熱心網友回復：
我使用lubridate它的功能的簡單性ymd()。
require(lubridate)
您首先創建一個月的第一天的向量：
start <- seq(ymd("1990-01-01"), ymd("2021-12-01"), by = "month")
然后創建另一個向量減去 1 天以獲得每個月的最后一天：
b <- start - 1
您洗掉該向量的第一個元素
end <- b[-1]
你加入他們
paste0(start, ":", end)
有一個容易（手動）修復的問題：最后一個間隔不正確。
uj5u.com熱心網友回復：
1) yearmon/yearqtr使用類創建每月序列yearmon，然后將其轉換為開始和結束日期。宿舍和yearqtr班級也是如此。在內部，兩者都按年份和年份的分數表示日期，因此請使用 1/12 和 1/4 in by=。另請注意， usingas.Date給出了月份或季度開始的日期，并且相同但使用frac=1引數給出了結束。
library(zoo)
# input
st <- as.Date("1990-01-01")
en <- as.Date("2021-12-01")
# by month
mon <- seq(as.yearmon(st), as.yearmon(en), 1/12)
paste(as.Date(mon), as.Date(mon, frac = 1), sep = ":")
# by quarter
qtr <- seq(as.yearqtr(st), as.yearqtr(en), 1/4)
paste(as.Date(qtr), as.Date(qtr, frac = 1), sep = ":")
關于結束日期應該是什么存在一些問題。上面給出了最后一個間隔 2021-12-31 的結束日期，但如果結束日期應該是 2021-12-01 以便沒有間隔超過，en則分別用這些替換兩條粘貼行。
paste(as.Date(mon), pmin(as.Date(mon, frac = 1), en), sep = ":")
paste(as.Date(qtr), pmin(as.Date(qtr, frac = 1), en), sep = ":")
2) 基數 R基數 R 的替代方法是使用涉及cut以下所示的運算式來獲得期末。(1) 似乎不那么棘手，但如果只需要使用基數 R，這可能會很有用。pmin如果我們想確保沒有范圍超出 ，可以使用與 (1) 中類似的方法en。
這個和其余的解決方案，但不是 (1)，假設這st是本月的第一天；但是，如果需要，這可以很容易地處理。
mon <- seq(st, en, by = "month")
paste(mon, as.Date(cut(mon 31, "month")) - 1, sep = ":")
qtr <- seq(st, en, by = "quarter")
paste(as.Date(qtr), as.Date(cut(qtr 93, "month")) - 1, sep = ":")
3) lubridate 使用這個包中的各種函式，我們可以撰寫以下內容。pmin如果范圍可能不超過 ，則可以使用與 (1) 類似的方法en。
library(lubridate)
mon <- seq(st, en, by = "month")
paste(mon, mon month(1) - 1, sep = ":")
qtr <- seq(st, en, by = "quarter")
paste(qtr, qtr quarter(1) - 1, sep = ":")
4) IDate We can use IDate class from data.table in which case we can make use of cut.IDate which returns another IDate object rather than a character string (as in base R).
st <- as.IDate("1990-01-01")
en <- as.IDate("2021-12-01")
mon <- seq(st, en, by = "month")
paste(mon, cut(mon 31, "month") - 1, sep = ":")
qtr <- seq(st, en, by = "quarter")
paste(qtr, cut(qtr 93, "month") - 1, sep = ":")
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