fix: replace deprecated datetime.utcnow() with timezone-aware datetime.now(timezone.utc)

[fazalpsinfo-cmyk]

Replace deprecated datetime.utcnow() with datetime.now(timezone.utc) across the memory module for Python 3.12+ compatibility.

datetime.utcnow() is deprecated since Python 3.12 (PEP 623).

Files changed:

• lib/crewai/src/crewai/memory/unified_memory.py
• lib/crewai/src/crewai/memory/storage/lancedb_storage.py
• lib/crewai/src/crewai/memory/types.py
• lib/crewai/src/crewai/memory/encoding_flow.py
• lib/crewai/tests/memory/test_unified_memory.py

Support this work: https://buymeacoffee.com/muhamedfazalps

[coderabbitai]

📝 Walkthrough

Walkthrough

Memory timestamp creation, parsing, storage, update flows, and recency calculations now use timezone-aware UTC datetimes.

Changes

Memory timestamp consistency

Layer / File(s)	Summary
Timestamp defaults and scoring lib/crewai/src/crewai/memory/types.py	MemoryRecord timestamp defaults and composite score age calculations now use timezone-aware UTC datetimes.
Timestamp propagation and storage lib/crewai/src/crewai/memory/unified_memory.py, lib/crewai/src/crewai/memory/encoding_flow.py, lib/crewai/src/crewai/memory/storage/lancedb_storage.py	Memory updates, encoding plans, schema placeholders, parsing fallbacks, and record touch operations now generate timezone-aware UTC timestamps.
Timezone-aware recency tests lib/crewai/tests/memory/test_unified_memory.py	Composite score tests now construct fresh and aged memory records with timezone-aware UTC timestamps.

Suggested reviewers: joaomdmoura

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: replacing deprecated naive UTC timestamps with timezone-aware UTC datetimes.
Description check	✅ Passed	The description is directly related to the changeset and accurately lists the affected memory files and Python 3.12 compatibility goal.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

lib/crewai/src/crewai/memory/storage/lancedb_storage.py (1)

264-271: 🩺 Stability & Availability | 🟠 Major | ⚡ Quick win

Normalize legacy timestamps to UTC in LanceDB records. \_parse_dt() leaves naive datetime.utcnow().isoformat() values unchanged, so compute_composite_score() and get_scope_info() can raise TypeError when they mix naive and UTC-aware datetimes. Normalize both parsed strings and datetime inputs here, and reuse the same helper in get_scope_info().

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@lib/crewai/src/crewai/memory/storage/lancedb_storage.py` around lines 264 -
271, Update _row_to_record’s _parse_dt helper to convert naive datetime inputs
and parsed timestamp strings to UTC-aware datetimes, while preserving existing
timezone information for aware values. Reuse this normalization helper in
get_scope_info() so all timestamp comparisons in compute_composite_score() and
scope handling consistently use UTC-aware datetimes.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Outside diff comments:
In `@lib/crewai/src/crewai/memory/storage/lancedb_storage.py`:
- Around line 264-271: Update _row_to_record’s _parse_dt helper to convert naive
datetime inputs and parsed timestamp strings to UTC-aware datetimes, while
preserving existing timezone information for aware values. Reuse this
normalization helper in get_scope_info() so all timestamp comparisons in
compute_composite_score() and scope handling consistently use UTC-aware
datetimes.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 95a68663-00c3-4daf-939d-04ec76055510

📥 Commits

Reviewing files that changed from the base of the PR and between 4e23bf6 and eefdea3.

📒 Files selected for processing (4)

• lib/crewai/src/crewai/memory/encoding_flow.py
• lib/crewai/src/crewai/memory/storage/lancedb_storage.py
• lib/crewai/src/crewai/memory/types.py
• lib/crewai/src/crewai/memory/unified_memory.py