[senid231]

Adds ActiveAdmin 4 support. ActiveAdmin 4 has no jQuery or Sprockets, so on v4 the date_time_picker input and the date_time_range filter render native datetime-local fields (date for a date column) instead of the xdsoft picker. ActiveAdmin 3 behaviour and assets are unchanged.

Decisions not visible in the diff:

• No JS or CSS on v4. ActiveAdmin 4 already styles native date inputs, including dark mode, so hosts install nothing.
• The v4 filter copies ActiveAdmin 4's DateRangeInput markup (.filters-form-input-group) and adds back the filter_date_time_range wrapper class so active_admin_date_range_preset can find the pair.
• Values are ISO (YYYY-MM-DDTHH:MM). A Ransack formatter swaps the T for a space, but only for untyped ransackers, which compare as strings.
• min_date/max_date/step map to min/max/step. Other xdsoft options are ignored on v4, as the README now says.
• New data-datetimepicker-* hooks on inputs and the range wrapper, on v3 and v4.
• Gemspec widened to < 5.0.0.a, so ActiveAdmin 5 prereleases stay out. Minor release: nothing changes for v3 hosts.

Verified locally: full suite green on AA 3.5 and AA 4.0.0.beta23 (Rails 8.0, plus 8.1 on v4). CI matrix gains a 4.0.0.beta23 column.

[Copilot]

🟡 Changes recommended

The datetime-local max_date fallback uses midnight, incorrectly rejecting later times on the intended inclusive final day, and the spec currently expects that incorrect boundary.

1 open issue

• Set datetime-local max_date to end of day · New

What changed in this PR

Adds ActiveAdmin 4 support through native date and datetime controls, while retaining the existing XDSoft picker for ActiveAdmin 3.

Changes:

• Adds native input rendering, option mapping, ISO-value handling, and shared data hooks.
• Separates test-app setup and feature coverage by ActiveAdmin version.
• Expands supported dependencies and CI coverage, and documents v4 behavior.

File	Description
tasks/​test.rake	Supports a configurable test-app path.
spec/​support/​rails_template.rb	Adapts asset setup for v4 and removes generated specs.
spec/​spec_helper.rb	Separates test apps and selects version-specific specs.
spec/​native_inputs_spec.rb	Tests native forms, filters, attributes, and browser values.
spec/​filter_form_spec.rb	Limits XDSoft filter tests to v3.
spec/​edit_form_spec.rb	Limits XDSoft form tests to v3.
spec/​data_hooks_spec.rb	Tests shared input and range hooks.
README.md	Documents v4 installation and native-input behavior.
lib/​active_admin_datetimepicker/​inputs/​filters/​date_time_range_input.rb	Adds native range markup and data hooks.
lib/​active_admin_datetimepicker/​base.rb	Formats native values and maps picker options.
lib/​active_admin_datetimepicker.rb	Adds ActiveAdmin version detection.
Gemfile	Selects asset dependencies by ActiveAdmin version.
config/​initializers/​active_admin_datetimepicker.rb	Normalizes ISO strings for Ransack predicates.
active_admin_datetimepicker.gemspec	Allows ActiveAdmin 4 and updates the description.
.github/​workflows/​ci.yml	Adds ActiveAdmin 4 beta coverage.

_{Review effort: Balanced}

[Copilot]

🔵 Needs a closer look

Combined date and datetime limits can discard stricter bounds, while offset-bearing string limits are not normalized to the application time zone, causing incorrect browser validation.

No open issues 🎉

2 previously missed issues

In code that hasn't changed since last review

Combine date and datetime limits using the stricter bound

lib/​active_admin_datetimepicker/​base.rb:94

When both date-level and datetime-level limits are configured, || discards the date-level limit even if it is stricter. For example, min_date: '2024-01-20' with min_date_time: '2024-01-10 12:00' allows January 15 despite the date restriction; maximum limits have the same issue. Preserve both constraints by taking the later minimum and the earlier maximum.

Normalize offset-bearing limit strings to the application time zone

lib/​active_admin_datetimepicker/​base.rb:119

Offset-bearing strings lose their offset without being converted to the application zone: in a UTC app, min_date_time: '2024-01-20T13:00:00+01:00' renders min="2024-01-20T13:00" instead of 12:00, unlike an equivalent Time/DateTime limit. This causes browser validation to reject valid times or accept times beyond a maximum. Parse strings in Time.zone so explicit offsets are normalized while offsetless values remain local wall times.

1 resolved since last review

• Set datetime-local max_date to end of day

_{Review effort: Balanced}