近期，由于業(yè)務(wù)需要計(jì)算兩個(gè)日期之前相差多少個(gè)月。我在網(wǎng)上找了很久，結(jié)果發(fā)現(xiàn)萬(wàn)能的python，居然沒有一個(gè)模塊計(jì)算兩個(gè)日期的月數(shù)，像Java、C#之類的高級(jí)語(yǔ)言，都會(huì)有(date1-date2).months的現(xiàn)成方法，覺得不可思議。說(shuō)句實(shí)在的，一直覺得python 的日期處理模塊真心不好用。

哦，對(duì)了，別跟我說(shuō) datetime, calendar, dateutil 這些模塊，因?yàn)槲叶荚囘^(guò)了，都沒用。有個(gè)竟然算出來(lái)還有錯(cuò)。datetime.timedelta只能計(jì)算出日時(shí)分秒。對(duì)年月卻不支持。網(wǎng)上一搜，一大堆的。

dateutil.rrule這個(gè)例子是我好不容易找到的，請(qǐng)看我的測(cè)試結(jié)果：

import datetimefrom dateutil import rruled1 = datetime.date(2016, 2, 29)d2 = datetime.date(2019, 3, 31)months = rrule.rrule(rrule.MONTHLY, dtstart=d1, until=d2).count()print(f"months={months}")

看到這樣的結(jié)果，我只能呵呵了。

廢話不多少，獻(xiàn)上自己寫的代碼：

該代碼返回，（月,小數(shù)月）

import datetimeimport calendar as cd1 = datetime.date(2016, 2, 29)d2 = datetime.date(2019, 3, 31)def calmonths(startdate, enddate):# 計(jì)算兩個(gè)日期相隔月差samemonthdate = Nonetry:samemonthdate = datetime.date(enddate.year, enddate.month,startdate.day)except Exception as e:print(e)samemonthdate = datetime.date(enddate.year, enddate.month,c.monthrange(enddate.year,enddate.month)[1])holdmonths = 0decimalmonth = 0.0if samemonthdate > enddate:premanthdate = Nonetry:premanthdate = datetime.date(enddate.year, enddate.month - 1,startdate.day)except Exception as e:print(e)premanthdate = datetime.date(enddate.year, enddate.month - 1,c.monthrange(enddate.year,enddate.month - 1)[1])currmonthdays = (samemonthdate - premanthdate).daysholdmonths = (premanthdate.year - startdate.year) * 12 + premanthdate.month - startdate.monthdecimalmonth = (enddate - premanthdate).days / currmonthdayselif samemonthdate < enddate:nextmonthdate = Nonetry:nextmonthdate = datetime.date(enddate.year, enddate.month + 1,startdate.day)except Exception as e:nextmonthdate = datetime.date(enddate.year, enddate.month + 1,c.monthrange(enddate.year,enddate.month + 1)[1])currmonthdays = (nextmonthdate - samemonthdate).daysholdmonths = (samemonthdate.year - startdate.year) * 12 + samemonthdate.month - startdate.monthdecimalmonth = (enddate - samemonthdate).days / currmonthdayselse:holdmonths = (enddate.year - startdate.year) * 12 + enddate.month - startdate.monthreturn holdmonths, decimalmonthmonths = calmonths(d1, d2)print(f"months={months}")

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