How can I find the number of days between two Date objects in Ruby

Question

How can I find the number of days between two Date objects

User · Accepted Answer

Subtract the beginning date from the end date   endDate - beginDate

User · Answer

irb main  005 0 gt  a   Date parse  12 1 2010     gt    lt Date  4911063 2 0 2299161 gt   irb main  007 0 gt  b   Date parse  12 21 2010     gt    lt Date  4911103 2 0 2299161 gt   irb main  016 0 gt  c   b mjd - a mjd   gt  20   This uses a Modified Julian Day Number    From wikipedia      The Julian date  JD  is the interval of time in days and fractions of a day since January 1  4713 BC Greenwich noon  Julian proleptic calendar

User · Answer

This may have changed in Ruby 2 0  When I do this I get a fraction  For example on the console  either irb or rails c   2 0 0-p195  005  gt  require  date     gt  true  2 0 0-p195  006  gt   a date   Date parse  25 12 2013      gt    lt Date  2013-12-25   2456652j 0s 0n   0s 2299161j  gt   2 0 0-p195  007  gt   b date   Date parse  10 12 2013      gt    lt Date  2013-12-10   2456637j 0s 0n   0s 2299161j  gt   2 0 0-p195  008  gt  a date-b date    gt   15 1     Of course  casting to an int give the expected result  2 0 0-p195  009  gt   a date-b date  to i    gt  15    This also works for DateTime objects  but you have to take into consideration seconds  such as this example  2 0 0-p195  017  gt    a date time   DateTime now    gt    lt DateTime  2013-12-31T12 23 03-08 00   2456658j 73383s 725757000n  -28800s 2299161j  gt   2 0 0-p195  018  gt  b date time   DateTime now-20    gt    lt DateTime  2013-12-11T12 23 06-08 00   2456638j 73386s 69998000n  -28800s 2299161j  gt   2 0 0-p195  019  gt  a date time - b date time    gt   1727997655759 86400000000   2 0 0-p195  020  gt   a date time - b date time  to i    gt  19  2 0 0-p195  021  gt  c date time   a date time-20    gt    lt DateTime  2013-12-11T12 23 03-08 00   2456638j 73383s 725757000n  -28800s 2299161j  gt   2 0 0-p195  022  gt  a date time - c date time    gt   20 1   2 0 0-p195  023  gt   a date time - c date time  to i    gt  20

User · Answer

In Ruby 2 1 3 things have changed    gt  endDate   Date new 2014  1  2     gt    lt Date  2014-01-02   2456660j 0s 0n   0s 2299161j  gt    gt  beginDate   Date new 2014  1  1     gt    lt Date  2014-01-01   2456659j 0s 0n   0s 2299161j  gt    gt  days   endDate - beginDate    gt   1 1    gt  days class    gt  Rational   gt  days to i    gt  1

User · Answer

Well  take care of what you mean by  between  too     days apart    to - from  to i       from   days apart   to total days    to - from  to i   1   number of  selected  days in between days    to - from  to i - 1   how many days are in between from and to  i e  excluding those two days

User · Answer

Try this   num days   later date - earlier date

User · Answer

How about this    beginDate   endDate  count   The Range is a set of unique serials  And     is an exclusive Range literal   So beginDate   endDate - 1  is same  Except is not   In case when beginDate equals endDate  first element will be excluded because of uniqueness and     will exclude last one  So if we want to  count dates between today and today it will return 0

User · Answer

all of these steered me to the correct result  but I wound up doing  DateTime now mjd - DateTime parse  01-01-1995   mjd

User · Answer

This worked for me    endDate - beginDate  to i

User · Answer

days    endDate - beginDate   60 60 24

[ruby] How can I find the number of days between two Date objects in Ruby?

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