harmony 鸿蒙Time and Time Zone Subsystem

2023-10-30
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Time and Time Zone Subsystem

Introduction

The time and time zone subsystem provides OpenHarmony with the capability of managing the system time, time zone, and timing.

Time and time zone management

Manages the system time and time zone in a unified manner, including setting and obtaining the system time, date, and time zone, and obtaining the system startup time.
Timing management

Provides the system timer capability, including creating, starting, stopping, and destroying timers. There are three types of timers: system startup timer, system time timer, and wakeup timer.

System Architecture

Figure 1 Architecture of the time and time zone subsystem

Directory Structure

The source code of the time and time zone subsystem is stored in the /base/time directory.

The directory structure is as follows:

/base/time/time_service
├── etc                      # Process configuration files
├── figures                  # Architecture diagram
├── framework/js/napi        # JS APIs that are parsed to NAPIs
├── interfaces/inner_api     # APIs provided for external systems
├── services                 # Service implementation
│   └── profile              # System service and process configuration files
└── utils                    # Utilities, for example, log utility