Scale fractional timestamp seconds to microseconds

[codewithfourtix]

tstamp2time() reads .123 as 123 microseconds instead of 123 milliseconds. Pad fractional seconds to six digits and truncate extra precision to match datetime microseconds.

Adds coverage for short fractions, leading zeros, six-digit fractions, and extra precision in both timestamp formats.

[Copilot]

🟢 Approval recommended

The implementation matches the described bug fix and the new tests cover the key fractional-second edge cases in both supported timestamp formats.

Pull request overview

Fixes tstamp2time() so fractional seconds are interpreted as fractions of a second (scaled/padded to 6-digit microseconds) instead of being treated as a raw microsecond integer.

Changes:

• Pad fractional seconds to 6 digits (right-pad with zeros) and truncate beyond 6 digits before applying datetime.microsecond.
• Add tests covering 1–6 digit fractions, leading zeros, and >6 digit truncation across both supported timestamp formats.

File summaries

File	Description
src/commoncode/timeutils.py	Scales/pads/truncates fractional seconds to correctly populate datetime.microsecond.
tests/test_timeutils.py	Adds coverage for short fractions, leading zeros, exact microseconds, and extra precision in both timestamp formats.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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