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介绍Linux下时间处理的相关操作(RTC、延时、闹钟、转换)

DS小龙哥发布时间：2021-11-23 21:00:00 ，浏览量：5

一、系统时间设置

这篇文章主要介绍Linux下时间处理的相关函数与操作。比如: 系统时间设置,读取、RTC时间设置,读取、时间单位转换、延时函数、闹钟信号等等。

Linux下存在两种时间： 1. 系统时间，2. RTC时间

系统时间是每次操作系统启动之后，从RTC驱动里读取进行设置的，一般只会在系统上电启动的时候自动(启动脚本)同步一次，后续用户也可以通过特定的命令再次同步；在系统界面上看到的时间就是系统时间；系统时间每次系统关机之后就会丢失，需要每次上电从RTC驱动里获取。

系统时间设置的方法如下:需要有管理员权限

[wbyq@wbyq linux_c]$ date -s "2020-10-12 9:28:20"
date: 无法设置日期: 不允许的操作
2020年 10月 12日 星期一 09:28:


    
        
            
                
                
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