I have a query here, following are the points on same(Adding today's is 31st August 2016 for future reference).
1st Scenario: So while doing some work on GNU date, I wanted to check what was the month(in numbers) by GNU date so I have done following.
Above gives me output as follows. 2nd Scenario: When I check this in terms of days then following is the result.
So after executing above scenarios I felt like if as a user I do -2 months with GNU date then it should ideally provide me month June, because when I do date -d"-3 months" +%m%d it shows me 0531.
So what is my observation is even we do -month option with GNU date in backend it will count by days only, if I am right here, so isn't it something kind of bug etc or it is expected behavior.
Will be grateful to all for your suggestions and advices here.
NOTE: testing it in BASH and version is date (GNU coreutils) 8.4.
Thanks,
R. Singh
Last edited by RavinderSingh13; 08-31-2016 at 12:44 PM..
There's a lot of corner cases. We had Feb 29th this year for example; Feb 29th minus 1 year gives you march 1st. Replicating GNU date's most obvious features was (slightly) easier than I thought, as it did pretty much what I did -- calculate the difference without trying to be too intelligent about it. It's intelligent enough to subtract the month number rather than a time offset of some sort, but doesn't correct the number of days after.
It's difficult to guess the user's intention for date math, so it's hard to call this a bug exactly. Rather it's just our convoluted, irrational calendar system and not-a-nice-round-number orbital period coming back to bite us once again.
If you wanted it to snap to months in that manner, try feeding it the first of the month and subtracting that, that should always work.*
*within timescales of 30 years. Ugh, dates are weird.
Last edited by Corona688; 08-31-2016 at 01:25 PM..
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