hotfix/converted-string-to-uppercase-in-convertUnixToTime

[ANCHITAYUSH]

This PR fixes the issue where the convertUnixToTime function returned lowercase "am" / "pm" instead of uppercase "AM" / "PM".
The test was failing because of case-sensitive string comparison.

• Before: 01:00 pm
• After: 01:00 PM

Changes Made
localDateTime.replace(/am|pm/, time => time.toUpperCase());

Fix

ISSUE: issue-52

[CLAassistant]

All committers have signed the CLA.

[ANCHITAYUSH]

Issue : issue-242

[aaronbrethorst]

The test passes on an en-US locale. The correct fix won't involve a regex to the application code, but making the test mock the locale.

[ANCHITAYUSH]

I’ve updated the test to mock the locale so that toLocaleTimeString consistently returns results in en-US format with uppercase AM/PM. This ensures the test passes deterministically across environments without modifying the application logic.

[coveralls]

coverage: 74.359%. remained the same
when pulling b31b5ea on ANCHITAYUSH:hotfix
into 8b3f045 on OneBusAway:main.