# Package org.apache.commons.lang.time

Provides classes and methods to work with dates and durations.

This includes:

- `DateUtils` - a set of static utility methods for working with dates
- `FastDateFormat` - a replacement for `SimpleDateFormat` that is fast and thread-safe
- `DateFormatUtils` - a formatting class for dates
- `StopWatch` - a duration timer

Since:
  2.0

  These classes are immutable (and therefore thread-safe) apart from `StopWatch`.

- Class Summary
  Class | Description
  --- | ---
  DateFormatUtils | Date and time formatting utilities and constants.
  DateUtils | A suite of utilities surrounding the use of the `Calendar` and `Date` object.
  DurationFormatUtils | Duration formatting utilities and constants.
  FastDateFormat | FastDateFormat is a fast and thread-safe version of `SimpleDateFormat`.
  StopWatch | `StopWatch` provides a convenient API for timings.