The operating system that the computer runs determines the time and date by its own clock. If the computer is connected to the Internet, then from time to time one of the OS components contacts the time server in order to "synchronize watches" and make the necessary adjustments to its own system time. However, only seconds are compared, but not hours and not date, so the user can mislead the internal "clockmaker" and manually set the desired day and hour.
Instructions
Step 1
To make today yesterday for a computer, it is necessary to "rewind" its system time for a day. This can be done both from the BIOS settings panel at the next computer boot, and from the operating system itself. The second method is much more convenient, so try to start changing the system time from there. In Windows OS, left-click on the digital clock in the lower right corner of the screen - in the notification area of the taskbar. This action in the latest versions of the system - Windows 7 and Vista - opens a window with an analog clock and calendar.
Step 2
Click on the inscription "Change the date and time settings" - it is placed under the calendar and clock and is designed to access the settings of the system clock you need.
Step 3
On the "Date and time" tab (it opens by default) you won't have to look for the required button for a long time - it says "Change date and time". Click this button and another window will open in which the calendar and clock are duplicated, but this time their readings can be changed.
Step 4
In the calendar, click on yesterday's date and you can complete the operation. If you need to change the time too, do it in the window under the analog clock. Then click OK on both this window and the next.
Step 5
In earlier versions of Windows, the steps are slightly different. In Windows XP, double-click on the digital clock in the tray and immediately after that you can start changing the date and time - these settings open without additional intermediate windows.
Step 6
There is one more way to open a component with date and time settings, which is equally applicable to different versions of Windows. It consists in "manual" calling the required OS component by the file name. Press the Win + R key combination, enter the file name timedate.cpl and click the OK button.
