GNU/Linux

$ ls -lct /etc | tail -1 | awk '{print $6, $7, $8}'
oct. 28 2013

$ tune2fs -l $(df / | tail -1 | cut -d" " -f1)  | grep created
Filesystem created:  Mon Oct 28 13:41:23 2013

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macOS

$ ls -lct / | tail -1 | awk '{print $6, $7, $8}'
12 oct 2012

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Windows

wmic os get installdate /value
InstallDate=20140716200726.000000+120

systeminfo | find /i "date"
Date d'installation originale: 16/07/14, 20:07:26

reg query "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion" /v InstallDate
InstallDate    REG_DWORD    0x53c6bf5e

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Sources :

• Connaître la date d'installation du SE
• Check OS Installation Dates
• How to Determine Your Computer’s Windows Installation Date
• How to Find Out the Date and Time When Windows was Installed in Your Computer?

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Historique

• 2018-05-21 : Ajout de la section macOS.