Issue #3431452 by godotislate, smustgrave, alexpott: Rename RenderElement and FormElement plugin abstract classes to RenderElementBase and FormElementBase

Issue #3421439 by godotislate, sorlov, quietone, smustgrave, alexpott, larowlan, longwave, andypost: Convert form and render element plugin discovery to attributes

Issue #2791693 by nginex, acbramley, oknate, guaneagler, jan kellermann, jonathan1055, jibran, ankithashetty, dpi, Jelle_S, FeyP, kattekrab, smustgrave, mpdonadio, quietone, AaronMcHale, rkoller, BlackBamboo, simohell, Jody Lynn, shaal, notmike: Remove sample date from date field error message and title attribute

Issue #2921133 by quietone, VladimirAus, xjm, ankithashetty, longwave, Prem Suthar, smustgrave, benjifisher, AaronMcHale: Remove "Please" from the codebase

Issue #3354606 by ranjith_kumar_k_u, pascalim, Abhijith S, smustgrave, borisson_: Datetime field name missing from validation error message

Issue #2941148 by quietone, bruno.bicudo, ravi.shankar, Sweetchuck, beatrizrodrigues, lucienchalom, VitaliyB98, WagnerMelo, sophiavs, ankitjain28may, daffie, longwave, Sutharsan, borisson_, cosmicdreams, heykarthikwithu, catch: Fix Drupal.Commenting.FunctionComment.MissingReturnType

Issue #3250349 by alexpott: \Drupal\Core\Datetime\Element\Datelist::processDatelist() does not use trusted callbacks - #date_date_callbacks only partially converted to TrustedCallbackInterface in 9.3.x

Issue #3250335 by alexpott, beatrizrodrigues, paulocs, longwave: #date_date_callbacks is broken in Drupal 9.3

Issue #3207567 by Spokje, quietone, guilhermevp, yogeshmpawar, daffie, alexpott: Fix Drupal.Commenting.FunctionComment.MissingParamComment

Issue #3222769 by bbrala, alexpott, longwave, Matroskeen: [November 8, 2021] Replace all list (array destructuring) assignment to the array syntax

Issue #3222251 by bbrala, longwave: [November 8, 2021] Replace all isset constructs with the null coalescing operator

Issue #3213572 by larowlan, phenaproxima, kim.pepper, xjm, tim.plunkett: #date_time_callbacks and #date_date_callbacks bypass the TrustedCallbackInterface protections

Issue #2851394 by GoZ, hgunicamp, oknate, jungle, wolffereast, tameeshb, mmatsoo, ridhimaabrol24, jofitz, swarad07, tanc, shaktik, dimaro, shashikant_chauhan, MerryHamster, quietone, nitesh624, martin_q, boaloysius, gaurav.kapoor, nitvirus, ankithashetty, Munavijayalakshmi, kostyashupenko, leolando.tan, amit.drupal, ravi.shankar, akashkrishnan01, Swapnil_Kotwal, Saviktor, mrinalini9, anmolgoyal74, Venkatesh Rajan.J, shimpy, lomasr, Dinesh18, shubham.prakash, mahtab_alam, markdorison, cilefen, longwave, bleen, xjm, alexpott, gmaltoni: Fix grammar 'a' to 'an' when necessary

Issue #2619482 by cburschka, ankit.singh, ravi.shankar, jungle, daffie: Convert all get_called_class()/get_class() to static::

Issue #3087606 by jhedstrom, kim.pepper, jonathan1055, partdigital, larowlan, acbramley, Berdir, yunke: Datetime::getInfo() caches user's timezone causing unpredictable timestamps

Issue #3072906 by bnjmnm, zrpnr, Wim Leers, lauriii, catch, mpdonadio, xjm, rainbreaw, andrewmacpherson, mgifford, anevins, jhedstrom: Deprecate and remove jQuery UI datepicker

Issue #3075661 by Spokje: getHtml5DateFormat and getHtml5TimeFormat in Drupal\Core\Datetime\Element\Datetime have incorrect Type in phpDoc

Issue #3009377 by kim.pepper, andypost, Berdir, alexpott, Wim Leers, mpdonadio, acbramley, larowlan, catch, xjm: Replace drupal_get_user_timezone with a date_default_timezone_get() and an event listener

Issue #3016064 by yogeshmpawar, vacho, msankhala, singhkiran, deepanker_bhalla, gambry, dpi: Improve documentation for Datetime and Datelist #date_timezone property

Issue #3008446 by alexpott, jcnventura, fenstrat, quietone, voleger, andypost: Complete the deprecation of format_date()

Issue #2799987 by jonathanshaw, oriol_e9g, Jo Fitzgerald, mpdonadio, GoZ, Mixologic, harsha012, jhedstrom: Datetime and Datelist element's timezone handling is fragile, buggy and wrongly documented

Issue #2672950 by Vj, ilya.no, Krzysztof Domański, elandirayan, Rijidij, amateescu, shahgm, larowlan: Notice: Undefined index: #default_value in Drupal\Core\Datetime\Element\Datetime::valueCallback() (line 103

Issue #2937853 by idebr, mfernea, SherFengChong, alexpott, borisson_: Fix 'Drupal.Formatting.MultipleStatementAlignment' coding standard

Issue #2486019 by mpdonadio, pfrenssen, webflo, michielnugter, maris.abols, ivanjaros, hauruck, MickeA, Jo Fitzgerald, mian3010, iMiksu: Wrong validation messages in Datelist::validateDatelist()

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2561993 by jhedstrom, jonathanjfshaw, yoroy, emma.maria, mpdonadio: Better labelling for Date time form select elements

Issue #2716685 by Mile23: Part 2: Fix several errors in the 'Drupal.Commenting.DocComment' coding standard

Issue #2572693 by Mile23, andriyun, andypost, attiks: Fix 'Drupal.ControlStructures.ControlSignature' coding standard

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits