[ISSUE-273] Use floating points to calculate relative time

[jama5262]

What does this PR do?

Use floating points to calculate relative time

Issue Reference

Fixes #273 Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Maintenance change (non-breaking change such as upgrading a dependency, refactoring, or making a lint fix)
• [ ] Documentation update
• [ ] Breaking change (a fix or feature that would cause existing functionality to change)

Screenshots

If applicable, add screenshots to help explain your problem.

Checklist

• [ ] Wrote additional tests, if needed
• [ ] All tests have passed, you can find the scripts from the ./bin folder
• [ ] I have updated the documentation accordingly, if needed.

Additional Information

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.46%. Comparing base (bbf07ee) to head (733cb70).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #274 +/- ## ======================================= Coverage 96.46% 96.46% ======================================= Files 36 36 Lines 1611 1611 ======================================= Hits 1554 1554 Misses 57 57 ```

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