The file /etc/profile is a configuration file that is read by the Bash shell when a user logs in. It contains commands and settings that apply to all users of the system, such as environment variables, PATH information, terminal settings, and security commands. Environment variables are variables that affect the behavior of programs and processes. For example, the PATH variable defines the directories where the shell looks for executable files, and the JAVA_HOME variable defines the location of the Java installation. The
/etc/profile file can also source other files from the /etc/profile.d/ directory, which can contain additional scripts for setting environment variables or other system-wide settings. The /etc/profile file is not the only file that can set environment variables for a user. There are also user-specific files, such as
~/.profile,~/.bash_profile, and ~/.bashrc, that are read by the shell after /etc/profile. These files can override or append to the settings in /etc/profile, or define new variables for the user. The order and precedence of these files depend on the type of shell (login or interactive) and the options used to start the shell. You can learn more about the difference between these files here1 and here2. References:
https://www.thegeekdiary.com/understanding-etc-profile-configuration-file-in-linux/
https://unix.stackexchange.com/questions/704610/what-does-the-etc-profile-do

The command that will correct the problem of the time being set backward by one day on a dual boot system is hwclock --systohc --localtime. This command will set the hardware clock (RTC) to the current system time and use the local time standard instead of UTC12. This will prevent the time inconsistency issue that occurs when dual booting Linux and Windows, as Windows assumes that the hardware clock is using local time while Linux assumes that it is using UTC34. By using the same time standard for both operating systems, the time will be displayed correctly on both Linux and Windows.
The other commands are either invalid or ineffective for solving the problem. The date -d '+ 1 day' command will display the date and time one day ahead of the current system time, but it will not change the system time or the hardware clock5. The ntpdate pool.ntp.org command will synchronize the system time with an NTP server, but it will not affect the hardware clock or thetime standard6. The time hwclock command will measure the time taken by the hwclock command, which will display the hardware clock time, but it will not change anything7.
References: 1: hwclock(8) - Linux man page 2: How to Fix Windows and Linux Showing Different Times When Dual Booting 3: Dual-Booting Linux Messed Up Windows Time? Here's How to Fix It 4: Wrong Time in Windows 10 After Dual Boot With Linux 5: date(1) - Linux man page 6: ntpdate(8) - Linux man page 7: time(1) - Linux man page

groupadd, /usr/sbin/groupadd