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Comment by schoen | Hacker News Reader

The date command can also answer this question:

  $ date -d 'march 12 2019 + 366 days'
  Thu Mar 12 00:00:00 PDT 2020

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For GNU date, yes. BSD not so much (default on MacOS).

    MacOS$ date -d 'now + 30 days'
    usage: date [-jnRu] [-d dst] [-r seconds] [-t west] [-v[+|-]val[ymwdHMS]] ...
  [-f fmt date | [[[mm]dd]HH]MM[[cc]yy][.ss]] [+format]GNU$ date -d 'now +30 days'

    GNU$ date -u -d 'now +30 days'
    Sun Apr  5 18:55:12 UTC 2020

(In BSD date, the '-d' argument "Set the kernel's value for daylight saving time.")

If you are on Windows, (or if you are on Linux but for some reason still runs) in PowerShell:

> (Get-Date).AddDays(365)

pure gold buddy, thanks for this

Or excel, rc[-1]+366, assuming you typed in the date you want in the cell to the left...

assuming you're on Unix

you could be running gnu/linux or windows with msys, neither of which are unix

I starting thinking about the Python equivalent of this and it was disgusting.

This?

  $ python -c 'import datetime; print(datetime.date(2019, 3, 12) + datetime.timedelta(days=366))'
  2020-03-12

Beautiful.

Yes.

Raku is a lot prettier than Python:

    perl6 -e 'say Date.new("2019-03-12").later( :366days )'
    2020-03-12
    perl6 -e 'say Date.new("2019-03-12") + 366'
    2020-03-12

Which recently became even shorter:

    raku -e 'say "2019-03-12".Date + 366'
    2020-03-12

Probably because I have a finance background, I would go straight to Excel.

Which makes dates out of things that are not even dates! (Like gene names)

Ruby isn't much better

    ruby -e "require 'date'; puts (Date.parse('march 12 2019') + 366)"
    2020-03-12

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