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bug#30795: Issue with date command and EDT

From: Pádraig Brady
Subject: bug#30795: Issue with date command and EDT
Date: Thu, 15 Mar 2018 04:18:03 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 15/03/18 00:15, Assaf Gordon wrote:
> Hello,
> On Wed, Mar 14, 2018 at 05:22:04PM -0700, Paul Eggert wrote:
>> On 03/13/2018 06:42 PM, Assaf Gordon wrote:
>>> Therefore it is always recommended to use noon (12pm)
>>> as explicit time when adjusting days
>> Maybe "date" should default to 12:00 instead of to 00:00 when the time is
>> not specified? That would avoid this sort of problem, typically.
> Technically it's an easy fix (patch attached),
> but it changes a long-standing behavior.
> I wonder if it will break some existing scripts that might rely
> on being 'midnight'? (even implicitly, because the user isn't aware of
> this nuance).
> For example, currently '2018-03-15 + 14 hours' is 2pm on March 15th.
> With this change, it'll result in 2am on March 16th.
> What do you think?

Yes picking 12:00 always is too simplistic I think.
The base should be dependent on the relative unit.
I proposed a solution previously at: http://bugs.gnu.org/18159#8

See also https://bugs.gnu.org/11101


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