fix: avoid deprecated UTC datetime helpers#399

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Mirochill wants to merge 1 commit into

opensafely-core:mainfrom

Mirochill:fix-234-datetime-deprecations

Mirochill commented May 23, 2026

Summary

replace first-party utcnow() and utcfromtimestamp() calls with timezone-aware UTC equivalents
keep existing naive UTC string output where callers currently append Z
update related tests to avoid deprecated datetime helpers

Fixes #234.

Validation

Not run locally
rg -n utcnow|utcfromtimestamp opensafely tests --glob !opensafely/_vendor/**
git diff --check
git diff --cached --check


          fix: avoid deprecated UTC datetime helpers

c4fef9b

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