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FieldtypeDatetimeAdvanced - subfield selectors for date/time

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Due to a discussion here in the forums, I was inspired to finally have a take on datetime fields and see if I couldn't get them to be searched a little more conveniently.

Here's a small module - still in alpha state, but I'd be happy to get some feedback - that allows searching for individual components of a date like year, month, day, hour or even day_of_week or day_of_year, and also returning them.

Github repo: DatetimeAdvanced

Current version: 0.0.5

Tested in: ProcessWire 2.8 + 3.0

Possible subfields:

  • day
  • month
  • year
  • hour
  • minute
  • second
  • day_of_week
  • day_of_year
  • week_of_year

Examples:

// Database search:
$pagelist = $pages->find("mydatefield.year=2016");

// Filtering PageArray in memory:
$maypages = $pagelist->filter("mydatefield.month=5");

// Back to our starting point:
$start = date('z');
$end = $start + 7;
$sevendays = $pages->find("mydatefield.day_of_year>=$start, mydatefield.day_of_year<$end");

// Nice side effect: subfields are now directly accessible
$blogentry = $pages->get('blog-entry-1');
echo $blogentry->title . "(" . $blogentry->publishdate->year . ")";

// New in 0.0.4: shorthand methods
echo $blogentry->publishdate->strftime("%Y-%m-%d %H:%M:%S") . PHP_EOL;
echo $blogentry->publishdate->date("Y-m-d H:i:s") . PHP_EOL;

ToDos for the future:

  • See if there's a possibility to specify ranges more conveniently
  • Check if this can perhaps wiggle its way into the PW core

Changes: example for direct subfield access and shorthand methods to strftime() and date() added.

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Just a short update: if MySQL (or the OS it's running on) and PHP are configured with different time zones, results will be wrong. You'll likely not notice anything off on local dev environments where everything is configured with the same time zone, but to prevent issues on deployment, MySQL needs to be made timezone-aware and PW's database connections need to tell MySQL which timezone to use for conversions, which should IMHO be done through a not-yet-existing $config property. That's why I've filed feature request #19.

I'm now holding my fingers crossed and waiting to hear if it gets considered. This will mean that, assuming it does, the module will require at least the PW version that gets the new $config property.

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@BitPoet, what do you think about changing from SQL timezone support being a strict requirement for installation to it being a strong suggestion?

My shared hosting server doesn't have timezone data but if I comment out the WireException in the install() method then things seem to work okay. The field values are saved with the correct date and time in the database and I can match pages as expected. Not sure if that means that the server's SQL and PHP are set to the same timezone (not sure how to test that).

The only issue I noticed is that with the "Default to today's date?" option selected in the field config the field shows an invalid date before a date has been entered:

2018-10-27_120037.png.7389ee5650e93fbbffd497024c688574.png

Would that be due to the missing timezone support?

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13 hours ago, Robin S said:

what do you think about changing from SQL timezone support being a strict requirement for installation to it being a strong suggestion?

I actually came to that conclusion too. The latest release outputs an error message but doesn't throw an exception anymore. There  are also instructions on the module config page how to set the correct offset through dbInitCommand in site/config.php so the global timezone in the MySQL server doesn't have to match that in PHP.

13 hours ago, Robin S said:

The only issue I noticed is that with the "Default to today's date?" option selected in the field config the field shows an invalid date before a date has been entered

I'm going to look into that one.

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16 hours ago, Robin S said:

The only issue I noticed is that with the "Default to today's date?" option selected in the field config the field shows an invalid date before a date has been entered

I couldn't replicate the issue here. Can you give some specifics about your setup (date/time output format, PHP version, PW version)?

Normally, DatetimeAdvanced should behave just like a regular Datetime field in that regard since it too delegates the formatting stuff to the WireDateTime class, but I might of course have missed some special cases.

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On 10/27/2018 at 12:03 PM, Robin S said:

The only issue I noticed is that with the "Default to today's date?" option selected in the field config the field shows an invalid date before a date has been entered

I could reproduce this locally too with DatetimeAdvanced v1.0.0, PW 3.0.115, PHP 7.1.

It seems that when a new page is created (after the first step of Add Page) the field gets a value of 0000-00-00 00:00:00 in the database. This gets converted to timestamp -62170025400 which then does not pass the conditional that sets the inputfield value to the current date/time.

In contrast, the core Datetime field does not set a value in the database until one is saved.

2018-10-28_160400.png.39908c04c77e3ac8f76bed7b3819a0f9.png

DatetimeAdvanced:

2018-10-28_160315.png.523e9cbb1d1ca7e0b7ad8b09435fb826.png

Datetime:

2018-10-28_160337.png.91fda37195b12231886f424b77452246.png

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This looks awesome! I was considering a similar advanced DateTime module that would store the UTC offset in addition to the timestamp, so in the UI you could select the date, time, and timezone. I might try this out and see if I can extend it for that purpose.

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On 11/9/2018 at 9:48 PM, gRegor said:

store the UTC offset in addition to the timestamp, so in the UI you could select the date, time, and timezone. I might try this out and see if I can extend it for that purpose.

I guess it should be doable by extending WireDT accordingly and implementing fitting getDatabaseSchema and savePageField/loadPageField methods as well as making sleepValue/wakeupValue with arrayish data instead of plain strings, a lot like the Events fieldtype but without the multiple value (EventsArray) stuff.

On 10/28/2018 at 4:05 AM, Robin S said:

I could reproduce this locally too with DatetimeAdvanced v1.0.0

Meanwhile reproduced and working on a solution. Should be ready in a few days at most.

Meanwhile, I haven't been completely lazy:

DatetimeAdvanced v1.0.3 supports custom subfields and works together with Lister's subfield selectors.

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@Robin S: since all good things take a while, I have committed a tentative fix for the "default to today" issue into the dev branch. Perhaps you could give it a spin and let me know if this works for you.

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@BitPoet, thanks for the update, but sorry to report the issue with "default to today" remains for me with new pages. I tested with the dev branch of the module.

Edit: I've just noticed that it doesn't make a difference if "default to today" is selected for the field - the issue occurs regardless. Not sure if this was always the case and I just failed to check this when I originally reported it.

2019-03-09_120642.png.753719d3c6c2a698f983934cf26f010d.png

Database:

2019-03-09_120633.png.272e5e904ba863902c5cde6050e86cd6.png

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@BitPoet, in case it helps, it seems that the relevant difference between a standard DateTime field and DateTimeAdvanced is that the standard field passes this test in Fieldtype.php for new pages...

// if the value is the same as the default, then remove the field from the database because it's redundant
if($value === $this->getBlankValue($page, $field)) return $this->deletePageField($page, $field); 

...but DateTimeAdvanced does not, resulting in an empty datetime value being stored in the DB.

 

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