Android 使用date set命令修改系统时间

测试环境：android 7.1.1   

在adb shell中试图使用 date -s "yyyymmdd.[[[hh]mm]ss]"修改系统系统时间时，会提示 date: Unknown option s

usage: date [-u] [-r FILE] [-d DATE] [+DISPLAY_FORMAT] [-D SET_FORMAT] [SET]

Set/get the current date/time. With no SET shows the current date.

Default SET format is "MMDDhhmm[[CC]YY][.ss]", that's (2 digits each)
month, day, hour (0-23), and minute. Optionally century, year, and second.
Also accepts "@UNIXTIME[.FRACTION]" as seconds since midnight Jan 1 1970.

-d      Show DATE instead of current time (convert date format)
-D      +FORMAT for SET or -d (instead of MMDDhhmm[[CC]YY][.ss])
-r      Use modification time of FILE instead of current date
-u      Use UTC instead of current timezone

+FORMAT specifies display format string using these escapes:

%% literal %             %n newline              %t tab
%S seconds (00-60)       %M minute (00-59)       %m month (01-12)
%H hour (0-23)           %I hour (01-12)         %p AM/PM
%y short year (00-99)    %Y year                 %C century
%a short weekday name    %A weekday name         %u day of week (1-7, 1=mon)
%b short month name      %B month name           %Z timezone name
%j day of year (001-366) %d day of month (01-31) %e day of month ( 1-31)
%s seconds past the Epoch

%U Week of year (0-53 start sunday)   %W Week of year (0-53 start monday)
%V Week of year (1-53 start monday, week < 4 days not part of this year)

%D = "%m/%d/%y"    %r = "%I : %M : %S %p"   %T = "%H:%M:%S"   %h = "%b"
%x locale date     %X locale time           %c locale date/time

date: Unknown option s

根据提示，使用以下命令

命令格式：date MMddHHmmyyyy.ss set
（月日时分年.秒）
例如：date 052514192019.22 set

date只是修改了系统时间，还应该把系统时间同步硬件时钟，否则系统重启后，时间是不会保存的

系统时间同步硬件时钟，可以用命令

busybox hwclock -w

busybox hwclock 语法如下

usage: hwclock [-rswtluf]

-f FILE Use specified device file instead of /dev/rtc (--rtc)
-l      Hardware clock uses localtime (--localtime)
-r      Show hardware clock time (--show)
-s      Set system time from hardware clock (--hctosys)
-t      Set the system time based on the current timezone (--systz)
-u      Hardware clock uses UTC (--utc)
-w      Set hardware clock from system time (--systohc)

　　常用的是

busybox hwclock -w  --从系统时间设置到硬件时钟
busybox hwclock -s  --从硬件时钟设置到系统时间

Android代码（Android系统需要能获取root权限）

    /**
     * 执行Android命令
     * @param cmd  命令
     */
    private static void execSuCmd(String cmd) {
        Process process = null;
        DataOutputStream os = null;
        DataInputStream is = null;
        try {
            process = Runtime.getRuntime().exec("su");
            os = new DataOutputStream(process.getOutputStream());
            os.writeBytes(cmd + "
");          
            os.writeBytes("exit
");
            os.flush();
            int aa = process.waitFor();
            is = new DataInputStream(process.getInputStream());
            byte[] buffer = new byte[is.available()];
            is.read(buffer);
            String out = new String(buffer);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (os != null) {
                    os.close();
                }
                if (is != null) {
                    is.close();
                }
                if (process != null){
                    process.destroy();
                }

            } catch (Exception e) {
            }
        }
    }

调用示例

String curr_time = “052514412019.52”;
execSuCmd("date " + curr_time
                    + "
 busybox hwclock -w
");

参考：https://blog.csdn.net/q1075355798/article/details/84660423