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From: Jakob Bohm <jb-usenet@wisemo.invalid>
Newsgroups: sci.crypt
Subject: Re: [OT] Unix Time Stamp - Independence Day 2025 :-)
Date: Fri, 12 Jul 2024 23:45:04 +0200
Organization: WiseMo A/S
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On 2024-06-16 22:13, Cri-Cri wrote:
> On Sun, 16 Jun 2024 09:43:19 +0200, Stefan Claas wrote:
> 
>> I wonder what else can be done with the Linux 'date'
>> command. :-)
> 
> Well, I suppose only one's imagination puts any barriers on that. I'm sure
> there are ways to, if not by date alone, so by combining date with other
> commands to get what you want.
> 
> Any ideas how to solve calculating the difference between two dates and
> report back years, months and days, like an age of some thing, or a
> person?
> 
> Like I bought my car on 2015-07-23, how old is it today? And how old will
> it be on 2026-07-23?
> 
> That type of thing.
> 
> Example:
> https://www.timeanddate.com/date/timeduration.html
> 
> I have a Python gadget that follows how that site does it, by excluding
> the end date:
> 
> $ sky -d2age "1970-01-01--2024-06-16"
> 54 years, 5 months and 15 days.
> 
> $ sky -d2age "1976-02-29--2024-06-16"
> 48 years, 3 months and 18 days.
> (In reality, since start year is a leap year, age is 12.0 years.)
> 
> I should really clean that result up a bit. :)
> 

# Beware that this shows one month too many, 1 month old is shown
#   as 02 (February) etc.  Also it doesn't count the specific month
#   boundaries crossed, just how far into a typical year the excess
#   days will go.
# The values below count age of the example car on the day this is
#   run under a modern shell like GNU bash, converting to pure
#   Bourne shell will need variables and extra programs like expr
#   and printf
# The date program is assumed to be the one from the GNU project.
date -u '+%y years %m months %d days %H:%M:%S' \
   -d @$(( ( ( $(date '+%s') - $(date -d "2015-07-23" '+%s') ) \
   / 86400 ) * 86400 + $(date -d '1999-12-31' '+%s') ))


Enjoy

Jakob
-- 
Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
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