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Old 02-03-2021, 08:55 AM   #1
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Published date with day (and time) or only with month
In the calibre UI the Published date is shown with month and year; however when I look in the exported OPF file I can see in the dc:date field a full datetime string with day and time information.

What is correct? Is the Ui just hiding the day/time details or is there more to it?
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Old 02-03-2021, 08:56 AM   #2
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You can control what is shown in the UI via Preferences->Tweaks
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Old 02-03-2021, 09:37 AM   #3
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Thanks, Kovid.

But how does it work the other way around: Say only the Month and Year a book was published are kown, how can I record this in the UI? OPf does allow date entries just as "yyyy-mm".
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Old 02-03-2021, 09:43 AM   #4
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Just enter it, default values will be sused for the rest just as i done in OPF, though you dont see it.
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Old 02-03-2021, 02:54 PM   #5
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Originally Posted by halloleo View Post
What is correct? Is the Ui just hiding the day/time details or is there more to it?
The full value is stored regardless of format (which is why you can copy/paste between datetime columns of unlike formats).
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Old 02-04-2021, 12:20 AM   #6
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The full value is stored regardless of format (which is why you can copy/paste between datetime columns of unlike formats).
But what can I do when I do not know the day and time of the published date? How can I distinguish an unknown day and time from 01 00:00:00 (which seems to be the default fill-in).

Very often day and time of the published field are unkown, but setting this information to valid default values doesn't seem right to me, because then there is no way to tell the difference between a fully known 1 Jan 2020 as published date and just 2020 as the published date.
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Old 02-04-2021, 12:32 AM   #7
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Originally Posted by halloleo View Post
But what can I do when I do not know the day and time of the published date? How can I distinguish an unknown day and time from 01 00:00:00 (which seems to be the default fill-in).
You can't.
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Old 02-04-2021, 12:40 AM   #8
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Thanks for the reply.

I'd say this is a shame: The OPF specification certainly allows for this (by having short date strings like "2020-01").

Anyway, I guess, it is what it is...
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Old 02-04-2021, 03:49 AM   #9
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Quote:
Originally Posted by halloleo View Post
Thanks for the reply.

I'd say this is a shame: The OPF specification certainly allows for this (by having short date strings like "2020-01").

Anyway, I guess, it is what it is...
I had a similar situation with movie release dates, sometimes I know the year, other times the year and month, and occasionally the year, month and day

Here you will find my solution ==>> Imprecise Dates

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Old 02-04-2021, 07:18 AM   #10
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@BetterRead Thanks for the tip! Interesting!

So this means the published field is a custom column, right? Can I export them in the OPF file?
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Old 02-04-2021, 07:54 PM   #11
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Originally Posted by halloleo View Post
@BetterRead Thanks for the tip! Interesting!

So this means the published field is a custom column, right? Can I export them in the OPF file?
Yes, these screen shots should explain the relevant Preferences I'm using:

Click image for larger version Name: 1.jpg Views: 171 Size: 155.7 KB ID: 185240

Click image for larger version Name: 2.jpg Views: 172 Size: 121.1 KB ID: 185241

And here you see the result:

Click image for larger version Name: 3.jpg Views: 185 Size: 254.9 KB ID: 185242

It suits me because I always use ISO (military) dates (and a 24 hour clock). Might not suit those who prefer other representations - e.g MMM.dd.yy.

This is what's written to the book folder\metadata.opf file and the content.opf file in the .epub file

Code:
<meta name="calibre:user_metadata:#part_date" content="{&quot;table&quot;: &quot;custom_column_61&quot;, &quot;column&quot;: &quot;value&quot;, &quot;datatype&quot;: &quot;text&quot;, &quot;is_multiple&quot;: null, &quot;kind&quot;: &quot;field&quot;, &quot;name&quot;: &quot;Partial Date&quot;, &quot;search_terms&quot;: [&quot;#part_date&quot;], &quot;label&quot;: &quot;part_date&quot;, &quot;colnum&quot;: 61, &quot;display&quot;: {&quot;use_decorations&quot;: 0, &quot;description&quot;: &quot;&quot;}, &quot;is_custom&quot;: true, &quot;is_category&quot;: true, &quot;link_column&quot;: &quot;value&quot;, &quot;category_sort&quot;: &quot;value&quot;, &quot;is_csp&quot;: false, &quot;is_editable&quot;: true, &quot;rec_index&quot;: 58, &quot;#value#&quot;: &quot;2008.05&quot;, &quot;#extra#&quot;: null, &quot;is_multiple2&quot;: {}}"/>
BR
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Old 02-04-2021, 08:25 PM   #12
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I'm getting a chuckle reading all the text in that third image.
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Old 02-04-2021, 08:47 PM   #13
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Quote:
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Yes, [...]

This is what's written to the book folder\metadata.opf file and the content.opf file in the .epub file

Code:
<meta name="calibre:user_metadata:#part_date" content="{&quot;table&quot;: &quot;custom_column_61&quot;, &quot;column&quot;: &quot;value&quot;, &quot;datatype&quot;: &quot;text&quot;, &quot;is_multiple&quot;: null, &quot;kind&quot;: &quot;field&quot;, &quot;name&quot;: &quot;Partial Date&quot;, &quot;search_terms&quot;: [&quot;#part_date&quot;], &quot;label&quot;: &quot;part_date&quot;, &quot;colnum&quot;: 61, &quot;display&quot;: {&quot;use_decorations&quot;: 0, &quot;description&quot;: &quot;&quot;}, &quot;is_custom&quot;: true, &quot;is_category&quot;: true, &quot;link_column&quot;: &quot;value&quot;, &quot;category_sort&quot;: &quot;value&quot;, &quot;is_csp&quot;: false, &quot;is_editable&quot;: true, &quot;rec_index&quot;: 58, &quot;#value#&quot;: &quot;2008.05&quot;, &quot;#extra#&quot;: null, &quot;is_multiple2&quot;: {}}"/>

Makes sense. Thanks!
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