| # //base: Time-Related Functionality |
| |
| This directory contains the portions of //base that deal with time-related |
| concepts. Most critical are the classes in [time.h](time.h). `Time` and |
| `TimeTicks` both encode absolute times, but `TimeTicks` is monotonic and should |
| be used for most internal purposes, while `Time` can move backwards and is |
| primarily for human-readable times. `TimeDelta` is a duration computed from |
| either of the above concepts. |
| |
| There are also various files dealing with clocks, which are primarily useful |
| when tests need to modify how the program tracks the passage of time. See |
| [/base/test/task_environment.h](/base/test/task_environment.h)'s `MOCK_TIME` |
| ability for |
| [testing components which post tasks](/docs/threading_and_tasks_testing.md). |
