From: "naruse (Yui NARUSE) via ruby-core" <ruby-core@...>
Date: 2025-08-22T07:36:51+00:00
Subject: [ruby-core:123047] [Ruby Feature#21533] Introduce `Time#am?` and `Time#pm?`

Issue #21533 has been updated by naruse (Yui NARUSE).

Status changed from Open to Rejected

We discussed about the edge cases 00:00 and 12:00 in developer meeting.
After some discussion we concluded there is no consensus whether 00:00 and 12:00 are a.m. or p.m.

For example U.S. Government Publishing Office, they changed the definition in 2008.
It feels it is still unstable.
https://en.wikipedia.org/wiki/12-hour_clock#Confusion_at_noon_and_midnight

----------------------------------------
Feature #21533: Introduce `Time#am?` and `Time#pm?`
https://bugs.ruby-lang.org/issues/21533#change-114364

* Author: matheusrich (Matheus Richard)
* Status: Rejected
----------------------------------------
This proposal adds two predicate methods to `Time`:

```ruby
Time.utc(2000, 1, 1, 11, 59, 59).am? # => true
Time.utc(2000, 1, 1, 12, 0, 0).pm?   # => true
```

* `am?` returns true when the hour is less than 12.
* `pm?` returns true when the hour is 12 or greater.

These methods provide a clear and expressive way to branch logic based on time of day. For example:

```ruby
def reminder_deferral_options
  options = []
  options << ["Later today", "later_today"] if Time.now.am?
  options << ["Tomorrow morning", "tomorrow_morning"]
  options << ["Pick a date/time���", "custom"]
  options
end
```

This is a common pattern in applications involving reminders and scheduling. The
method names are intuitive, and the semantics are well understood.

The implementation is in [this Pull Request](https://github.com/ruby/ruby/pull/14133).




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