MacOS is a very reliable system. So much so that you can turn it on once – and not turn it off for many days, weeks and even months. Users sometimes restart their Mac once a year – when a macOS update comes out.
And how do you know when the last reboot / power on was? This is both interesting and useful – this way you can find out exactly when you installed the macOS update. Or, if something is broken in the system, specify when the “suspicious” update was installed for this or that program.
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How to know when your Mac was last turned on or restarted
Method # 1 – Terminal
1. Open the app Terminal – across Programs → Utilities or through the search query Spotlight (the magnifying glass icon in the upper right corner of the screen).
2. Enter the command uptime and press on the keyboard Return (Enter).
On screen Terminal information will immediately appear about when the computer was turned on the last time.
If you want to know how much time has passed since the last reboot, enter the command last reboot… Information about the last 20 “rebates” will be displayed in the format “day of the week – month – day – exact time (up to a minute)“.
If you want to know when the system was last shut down, enter in the window Terminal command last shutdown…
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Method # 2 – System information
If for some reason you are not ready to use the services Terminal – there is another way.
1. Click on the Apple menu (“bull’s eye” in the upper left corner of the screen) and select About this Mac…
2. Click on the label System report in the tab Overview, then select Software.
3. Information about the time elapsed since the last power-on is in the line Time after loading…