<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Introduced support for parsing and converting duration strings (e.g., "1h30m") into milliseconds and seconds.
- Added utility methods to handle a wide range of time units and their combinations.
- Added functions to calculate dates offset before or after a given date by specified durations.
- **Tests**
- Implemented comprehensive automated tests to ensure accurate parsing and conversion of duration strings.
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