How do I find the install time and date of Windows

Question

This might sound like a little bit of a crazy question  but how can I find out  hopefully via an API registry key  the install time and date of Windows   The best I can come up with so far is to look at various files in C  Windows and try to guess    but that s not exactly a nice solution

User · Answer

In Powershell run the command   systeminfo   Select-String  Install Date

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You can also check the check any folder in the system drive like  windows  and  program files   Right click the folder  click on the properties and check under the general tab the date when the folder was created

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In RunCommand  write  MSINFO32  and hit enter It will show All information related to system

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We have enough answers here but I want to put my 5 cents   I have Windows 10 installed on 10 30 2015 and Creators Update installed on 04 14 2017 on top of my previous installation  All of the methods described in the answers before mine gives me the date of the Creators Update installation     I ve managed to find few files  date of creation which matches the real  clean  installation date of my Windows 10    in C  Windows      in C

User · Answer

You can do this with PowerShell   Get-ItemProperty -Path  HKLM  SOFTWARE Microsoft Windows NT CurrentVersion   -Name InstallDate       Select-Object -Property   n  InstallDate  e   DateTime   new 1970 1 1 0 0 0 0  UTC   AddSeconds    InstallDate  ToLocalTime

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Another question elligeable for a  code-challenge   here are some source code executables to answer the problem  but they are not complete  Will you find a vb script that anyone can execute on his her computer  with the expected result    systeminfo find  i  quot original quot    would give you the actual date    not the number of seconds    As Sammy comments  find  i  quot install quot  gives more than you need  And this only works if the locale is English  It needs to match the language  For Swedish this would be  quot ursprungligt quot  and  quot urspr  ngliches quot  for German   In Windows PowerShell script  you could just type  PS  gt   os   get-wmiobject win32 operatingsystem PS  gt   os ConvertToDateTime  os InstallDate  -f  quot MM dd yyyy quot    By using WMI  Windows Management Instrumentation  If you do not use WMI  you must read then convert the registry value  PS  gt   path    HKLM  SOFTWARE Microsoft Windows NT CurrentVersion  PS  gt   id   get-itemproperty -path  path -name InstallDate PS  gt   d   get-date -year 1970 -month 1 -day 1 -hour 0 -minute 0 -second 0    add to hours  GMT offset     to get the timezone offset programatically     get-date -f zz PS  gt    d AddSeconds  id InstallDate   ToLocalTime   AddHours  get-date -f zz   -f  quot MM dd yyyy quot   The rest of this post gives you other ways to access that same information  Pick your poison     In VB Net that would give something like  Dim dtmInstallDate As DateTime Dim oSearcher As New ManagementObjectSearcher  quot SELECT   FROM Win32 OperatingSystem quot   For Each oMgmtObj As ManagementObject In oSearcher Get     dtmInstallDate           ManagementDateTimeConverter ToDateTime CStr oMgmtO bj  quot InstallDate quot     Next   In Autoit  a Windows scripting language   that would be   Windows Install Date    readreg   RegRead  quot HKLM SOFTWARE MICROSOFT WINDOWS NT CURRENTVERSION  quot    quot InstallDate quot    sNewDate    DateAdd   s   readreg   quot 1970 01 01 00 00 00 quot   MsgBox  4096   quot  quot    quot Date   quot   amp   sNewDate   Exit   In Delphy 7  that would go as  Function GetInstallDate  String  Var   di  longint    buf  Array   0  3   Of byte  Begin   Result     Unknown     With TRegistry Create Do   Begin     RootKey    HKEY LOCAL MACHINE      LazyWrite    True      OpenKey     SOFTWARE Microsoft Windows NT CurrentVersion   False        di    readbinarydata    InstallDate   buf  sizeof   buf            Result    DateTimeToStr   FileDateToDateTime   buf   0     buf   1     256   buf   2     65535   buf   3     16777216      showMessage inttostr di        Free    End  End    As an alternative  CoastN proposes in the comments   As the system ini-file stays untouched in a typical windows deployment  you can actually get the install-date by using the following oneliner   PowerShell    Get-Item  quot C  Windows system ini quot   CreationTime

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Another question elligeable for a  code-challenge   here are some source code executables to answer the problem  but they are not complete  Will you find a vb script that anyone can execute on his her computer  with the expected result    systeminfo find  i  quot original quot    would give you the actual date    not the number of seconds    As Sammy comments  find  i  quot install quot  gives more than you need  And this only works if the locale is English  It needs to match the language  For Swedish this would be  quot ursprungligt quot  and  quot urspr  ngliches quot  for German   In Windows PowerShell script  you could just type  PS  gt   os   get-wmiobject win32 operatingsystem PS  gt   os ConvertToDateTime  os InstallDate  -f  quot MM dd yyyy quot    By using WMI  Windows Management Instrumentation  If you do not use WMI  you must read then convert the registry value  PS  gt   path    HKLM  SOFTWARE Microsoft Windows NT CurrentVersion  PS  gt   id   get-itemproperty -path  path -name InstallDate PS  gt   d   get-date -year 1970 -month 1 -day 1 -hour 0 -minute 0 -second 0    add to hours  GMT offset     to get the timezone offset programatically     get-date -f zz PS  gt    d AddSeconds  id InstallDate   ToLocalTime   AddHours  get-date -f zz   -f  quot MM dd yyyy quot   The rest of this post gives you other ways to access that same information  Pick your poison     In VB Net that would give something like  Dim dtmInstallDate As DateTime Dim oSearcher As New ManagementObjectSearcher  quot SELECT   FROM Win32 OperatingSystem quot   For Each oMgmtObj As ManagementObject In oSearcher Get     dtmInstallDate           ManagementDateTimeConverter ToDateTime CStr oMgmtO bj  quot InstallDate quot     Next   In Autoit  a Windows scripting language   that would be   Windows Install Date    readreg   RegRead  quot HKLM SOFTWARE MICROSOFT WINDOWS NT CURRENTVERSION  quot    quot InstallDate quot    sNewDate    DateAdd   s   readreg   quot 1970 01 01 00 00 00 quot   MsgBox  4096   quot  quot    quot Date   quot   amp   sNewDate   Exit   In Delphy 7  that would go as  Function GetInstallDate  String  Var   di  longint    buf  Array   0  3   Of byte  Begin   Result     Unknown     With TRegistry Create Do   Begin     RootKey    HKEY LOCAL MACHINE      LazyWrite    True      OpenKey     SOFTWARE Microsoft Windows NT CurrentVersion   False        di    readbinarydata    InstallDate   buf  sizeof   buf            Result    DateTimeToStr   FileDateToDateTime   buf   0     buf   1     256   buf   2     65535   buf   3     16777216      showMessage inttostr di        Free    End  End    As an alternative  CoastN proposes in the comments   As the system ini-file stays untouched in a typical windows deployment  you can actually get the install-date by using the following oneliner   PowerShell    Get-Item  quot C  Windows system ini quot   CreationTime

User · Answer

Use speccy  It shows the installation date in Operating System section  http   www piriform com speccy

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Press WindowsKey   R and enter cmd  In the command window type   systeminfo   find  i  Original     for older versions of windows  type  ORIGINAL  in all capital letters

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Press WindowsKey   R and enter cmd  In the command window type   systeminfo   find  i  Original     for older versions of windows  type  ORIGINAL  in all capital letters

User · Answer

You can do this with PowerShell   Get-ItemProperty -Path  HKLM  SOFTWARE Microsoft Windows NT CurrentVersion   -Name InstallDate       Select-Object -Property   n  InstallDate  e   DateTime   new 1970 1 1 0 0 0 0  UTC   AddSeconds    InstallDate  ToLocalTime

User · Answer

Use speccy  It shows the installation date in Operating System section  http   www piriform com speccy

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In regedit exe go to   HKEY LOCAL MACHINE SOFTWARE Microsoft Windows NT CurrentVersion InstallDate   It s given as the number of seconds since January 1  1970   Note  for Windows 10  this date will be when the last feature update was installed  not the original install date    To convert that number into a readable date time just paste the decimal value in the field  UNIX TimeStamp   of this Unix Time Conversion online tool

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I find the creation date of c  pagefile sys can be pretty reliable in most cases  It can easily be obtained using this command  assuming Windows is installed on C     dir  as  t c c  pagefile sys   The   as  specifies  system files   otherwise it will not be found  The   t c  sets the time field to display  creation

User · Answer

Determine the Windows Installation Date with WMIC  wmic os get installdate

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HKLM SOFTWARE Microsoft Windows NT CurrentVersion InstallDate and systeminfo exe produces the wrong date   The definition of UNIX timestamp is timezone independent  The UNIX timestamp is defined as the number of seconds that have elapsed since 00 00 00 Coordinated Universal Time  UTC   Thursday  1 January 1970 and not counting leap seconds   In other words  if you have installed you computer in Seattle  WA and moved to New York NY the HKLM SOFTWARE Microsoft Windows NT CurrentVersion InstallDate will not reflect this  It s the wrong date  it doesn t store timezone where the computer was initially installed   The effect of this is  if you change the timezone while running this program  the date will be wrong  You have to re-run the executable  in order for it to account for the timezone change   But you can get the timezone info from the WMI Win32 Registry class   InstallDate is in the UTC format  yyyymmddHHMMSS xxxxxx  UUU  as per Microsoft TechNet article  Working with Dates and Times using WMI  where notably xxxxxx is milliseconds and   UUU is number of minutes different from Greenwich Mean Time     private static string RegistryInstallDate                  DateTime InstallDate   new DateTime 1970  1  1  0  0  0      NOT a unix timestamp 99  of online solutions incorrect identify this as              ManagementObjectSearcher searcher   new ManagementObjectSearcher  SELECT   FROM Win32 Registry             foreach  ManagementObject wmi Windows in searcher Get                          try                                  CultureInfo ci   CultureInfo InvariantCulture                  string installdate   wmi Windows  InstallDate   ToString                        InstallDate is in the UTC format  yyyymmddHHMMSS xxxxxx  UUU  where critically                                        xxxxxx is milliseconds and                             UUU   is number of minutes different from Greenwich Mean Time                    if  installdate Length  25                                        string yyyymmddHHMMSS   installdate Split      0                       string xxxxxxsUUU   installdate Split      1             s for sign                      int year    int Parse yyyymmddHHMMSS Substring 0  4                        int month   int Parse yyyymmddHHMMSS Substring 4  2                        int date    int Parse yyyymmddHHMMSS Substring 4   2  2                        int hour    int Parse yyyymmddHHMMSS Substring 4   2   2  2                        int mins    int Parse yyyymmddHHMMSS Substring 4   2   2   2   2                        int secs    int Parse yyyymmddHHMMSS Substring 4   2   2   2   2  2                        int msecs   int Parse xxxxxxsUUU Substring 0  6                         double UTCoffsetinMins   double Parse xxxxxxsUUU Substring 6  4                        TimeSpan UTCoffset   TimeSpan FromMinutes UTCoffsetinMins                        InstallDate   new DateTime year  month  date  hour  mins  secs  msecs    UTCoffset                                      break                            catch  Exception                                InstallDate   DateTime Now                                   return String Format   0 ddd d-MMM-yyyy h mm ss tt    InstallDate

User · Answer

You can simply check the creation date of Windows Folder  right click on it and check properties

User · Answer

Open command prompt  type  systeminfo  and press enter  Your system may take few mins to get the information  In the result page you will find an entry as  System Installation Date   That is the date of windows installation  This process works in XP  Win7 and also on win8

User · Answer

In RunCommand  write  MSINFO32  and hit enter It will show All information related to system

User · Answer

Another question elligeable for a  code-challenge   here are some source code executables to answer the problem  but they are not complete  Will you find a vb script that anyone can execute on his her computer  with the expected result    systeminfo find  i  quot original quot    would give you the actual date    not the number of seconds    As Sammy comments  find  i  quot install quot  gives more than you need  And this only works if the locale is English  It needs to match the language  For Swedish this would be  quot ursprungligt quot  and  quot urspr  ngliches quot  for German   In Windows PowerShell script  you could just type  PS  gt   os   get-wmiobject win32 operatingsystem PS  gt   os ConvertToDateTime  os InstallDate  -f  quot MM dd yyyy quot    By using WMI  Windows Management Instrumentation  If you do not use WMI  you must read then convert the registry value  PS  gt   path    HKLM  SOFTWARE Microsoft Windows NT CurrentVersion  PS  gt   id   get-itemproperty -path  path -name InstallDate PS  gt   d   get-date -year 1970 -month 1 -day 1 -hour 0 -minute 0 -second 0    add to hours  GMT offset     to get the timezone offset programatically     get-date -f zz PS  gt    d AddSeconds  id InstallDate   ToLocalTime   AddHours  get-date -f zz   -f  quot MM dd yyyy quot   The rest of this post gives you other ways to access that same information  Pick your poison     In VB Net that would give something like  Dim dtmInstallDate As DateTime Dim oSearcher As New ManagementObjectSearcher  quot SELECT   FROM Win32 OperatingSystem quot   For Each oMgmtObj As ManagementObject In oSearcher Get     dtmInstallDate           ManagementDateTimeConverter ToDateTime CStr oMgmtO bj  quot InstallDate quot     Next   In Autoit  a Windows scripting language   that would be   Windows Install Date    readreg   RegRead  quot HKLM SOFTWARE MICROSOFT WINDOWS NT CURRENTVERSION  quot    quot InstallDate quot    sNewDate    DateAdd   s   readreg   quot 1970 01 01 00 00 00 quot   MsgBox  4096   quot  quot    quot Date   quot   amp   sNewDate   Exit   In Delphy 7  that would go as  Function GetInstallDate  String  Var   di  longint    buf  Array   0  3   Of byte  Begin   Result     Unknown     With TRegistry Create Do   Begin     RootKey    HKEY LOCAL MACHINE      LazyWrite    True      OpenKey     SOFTWARE Microsoft Windows NT CurrentVersion   False        di    readbinarydata    InstallDate   buf  sizeof   buf            Result    DateTimeToStr   FileDateToDateTime   buf   0     buf   1     256   buf   2     65535   buf   3     16777216      showMessage inttostr di        Free    End  End    As an alternative  CoastN proposes in the comments   As the system ini-file stays untouched in a typical windows deployment  you can actually get the install-date by using the following oneliner   PowerShell    Get-Item  quot C  Windows system ini quot   CreationTime

User · Answer

Open command prompt  type  systeminfo  and press enter  Your system may take few mins to get the information  In the result page you will find an entry as  System Installation Date   That is the date of windows installation  This process works in XP  Win7 and also on win8

User · Answer

Very simple way from PowerShell    Get-CimInstance -Class Win32 OperatingSystem  InstallDate   Extracted from  https   www sysadmit com 2019 10 windows-cuando-fue-instalado html

User · Answer

HKLM SOFTWARE Microsoft Windows NT CurrentVersion InstallDate and systeminfo exe produces the wrong date   The definition of UNIX timestamp is timezone independent  The UNIX timestamp is defined as the number of seconds that have elapsed since 00 00 00 Coordinated Universal Time  UTC   Thursday  1 January 1970 and not counting leap seconds   In other words  if you have installed you computer in Seattle  WA and moved to New York NY the HKLM SOFTWARE Microsoft Windows NT CurrentVersion InstallDate will not reflect this  It s the wrong date  it doesn t store timezone where the computer was initially installed   The effect of this is  if you change the timezone while running this program  the date will be wrong  You have to re-run the executable  in order for it to account for the timezone change   But you can get the timezone info from the WMI Win32 Registry class   InstallDate is in the UTC format  yyyymmddHHMMSS xxxxxx  UUU  as per Microsoft TechNet article  Working with Dates and Times using WMI  where notably xxxxxx is milliseconds and   UUU is number of minutes different from Greenwich Mean Time     private static string RegistryInstallDate                  DateTime InstallDate   new DateTime 1970  1  1  0  0  0      NOT a unix timestamp 99  of online solutions incorrect identify this as              ManagementObjectSearcher searcher   new ManagementObjectSearcher  SELECT   FROM Win32 Registry             foreach  ManagementObject wmi Windows in searcher Get                          try                                  CultureInfo ci   CultureInfo InvariantCulture                  string installdate   wmi Windows  InstallDate   ToString                        InstallDate is in the UTC format  yyyymmddHHMMSS xxxxxx  UUU  where critically                                        xxxxxx is milliseconds and                             UUU   is number of minutes different from Greenwich Mean Time                    if  installdate Length  25                                        string yyyymmddHHMMSS   installdate Split      0                       string xxxxxxsUUU   installdate Split      1             s for sign                      int year    int Parse yyyymmddHHMMSS Substring 0  4                        int month   int Parse yyyymmddHHMMSS Substring 4  2                        int date    int Parse yyyymmddHHMMSS Substring 4   2  2                        int hour    int Parse yyyymmddHHMMSS Substring 4   2   2  2                        int mins    int Parse yyyymmddHHMMSS Substring 4   2   2   2   2                        int secs    int Parse yyyymmddHHMMSS Substring 4   2   2   2   2  2                        int msecs   int Parse xxxxxxsUUU Substring 0  6                         double UTCoffsetinMins   double Parse xxxxxxsUUU Substring 6  4                        TimeSpan UTCoffset   TimeSpan FromMinutes UTCoffsetinMins                        InstallDate   new DateTime year  month  date  hour  mins  secs  msecs    UTCoffset                                      break                            catch  Exception                                InstallDate   DateTime Now                                   return String Format   0 ddd d-MMM-yyyy h mm ss tt    InstallDate

User · Answer

Determine the Windows Installation Date with WMIC  wmic os get installdate

User · Answer

I find the creation date of c  pagefile sys can be pretty reliable in most cases  It can easily be obtained using this command  assuming Windows is installed on C     dir  as  t c c  pagefile sys   The   as  specifies  system files   otherwise it will not be found  The   t c  sets the time field to display  creation

User · Answer

Try this powershell command   Get-ChildItem -Path HKLM  System Setup Source      ForEach-Object  Get-ItemProperty -Path Registry              Select-Object ProductName  ReleaseID  CurrentBuild    n  Install Date   e    DateTime  1 1 1970   AddSeconds    InstallDate                Sort-Object  Install Date

User · Answer

You can also check the check any folder in the system drive like  windows  and  program files   Right click the folder  click on the properties and check under the general tab the date when the folder was created

User · Answer

You can simply check the creation date of Windows Folder  right click on it and check properties

User · Answer

Try this powershell command   Get-ChildItem -Path HKLM  System Setup Source      ForEach-Object  Get-ItemProperty -Path Registry              Select-Object ProductName  ReleaseID  CurrentBuild    n  Install Date   e    DateTime  1 1 1970   AddSeconds    InstallDate                Sort-Object  Install Date

User · Answer

In regedit exe go to   HKEY LOCAL MACHINE SOFTWARE Microsoft Windows NT CurrentVersion InstallDate   It s given as the number of seconds since January 1  1970   Note  for Windows 10  this date will be when the last feature update was installed  not the original install date    To convert that number into a readable date time just paste the decimal value in the field  UNIX TimeStamp   of this Unix Time Conversion online tool

User · Answer

We have enough answers here but I want to put my 5 cents   I have Windows 10 installed on 10 30 2015 and Creators Update installed on 04 14 2017 on top of my previous installation  All of the methods described in the answers before mine gives me the date of the Creators Update installation     I ve managed to find few files  date of creation which matches the real  clean  installation date of my Windows 10    in C  Windows      in C

User · Answer

How to find out Windows 7 installation date time   just see this       start   enter CMD enter systeminfo   that s it  then you can see all information about your machine  very simple method

User · Answer

Very simple way from PowerShell    Get-CimInstance -Class Win32 OperatingSystem  InstallDate   Extracted from  https   www sysadmit com 2019 10 windows-cuando-fue-instalado html

User · Answer

After trying a variety of methods  I figured that the NTFS volume creation time of the system volume is probably the best proxy  While there are tools to check this  see this link   I wanted a method without an additional utility   I settled on the creation date of  quot C  System Volume Information quot  and it seemed to check out in various cases  One-line of PowerShell to get it is    DateTime  Get-Item -Force  C  System Volume Information    CreationTime  ToString  MM dd yyyy

User · Answer

Windows 10 OS has yet another registry subkey  this one in the SYSTEM hive file    Computer HKEY LOCAL MACHINE SYSTEM Setup    The Install Date information here is the original computer OS install date time  It also tells you when the update started  ie   Computer HKEY LOCAL MACHINE SYSTEM Setup Source OS  Updated on xxxxxx      This may of course not be when the update ends  the user may choose to turn off instead of rebooting when prompted  etc     The update can actually complete on a different day  and  Computer HKEY LOCAL MACHINE SYSTEM Setup Source OS  Updated on xxxxxx     will reflect the date time it started the update

User · Answer

In regedit exe go to   HKEY LOCAL MACHINE SOFTWARE Microsoft Windows NT CurrentVersion InstallDate   It s given as the number of seconds since January 1  1970   Note  for Windows 10  this date will be when the last feature update was installed  not the original install date    To convert that number into a readable date time just paste the decimal value in the field  UNIX TimeStamp   of this Unix Time Conversion online tool

User · Answer

After trying a variety of methods  I figured that the NTFS volume creation time of the system volume is probably the best proxy  While there are tools to check this  see this link   I wanted a method without an additional utility   I settled on the creation date of  quot C  System Volume Information quot  and it seemed to check out in various cases  One-line of PowerShell to get it is    DateTime  Get-Item -Force  C  System Volume Information    CreationTime  ToString  MM dd yyyy

User · Answer

How to find out Windows 7 installation date time   just see this       start   enter CMD enter systeminfo   that s it  then you can see all information about your machine  very simple method

User · Answer

In regedit exe go to   HKEY LOCAL MACHINE SOFTWARE Microsoft Windows NT CurrentVersion InstallDate   It s given as the number of seconds since January 1  1970   Note  for Windows 10  this date will be when the last feature update was installed  not the original install date    To convert that number into a readable date time just paste the decimal value in the field  UNIX TimeStamp   of this Unix Time Conversion online tool

User · Answer

Ever wanted to find out your PC   s operating system installation date  Here is a quick and easy way to find out the date and time at which your PC operating system installed or last upgraded    Open the command prompt  start-  run -  type  cmd-  hit enter  and run the following command  systeminfo   find  i  install date   In couple of seconds you will see the installation date

User · Answer

Ever wanted to find out your PC   s operating system installation date  Here is a quick and easy way to find out the date and time at which your PC operating system installed or last upgraded    Open the command prompt  start-  run -  type  cmd-  hit enter  and run the following command  systeminfo   find  i  install date   In couple of seconds you will see the installation date

User · Answer

In Powershell run the command   systeminfo   Select-String  Install Date

User · Answer

Another question elligeable for a  code-challenge   here are some source code executables to answer the problem  but they are not complete  Will you find a vb script that anyone can execute on his her computer  with the expected result    systeminfo find  i  quot original quot    would give you the actual date    not the number of seconds    As Sammy comments  find  i  quot install quot  gives more than you need  And this only works if the locale is English  It needs to match the language  For Swedish this would be  quot ursprungligt quot  and  quot urspr  ngliches quot  for German   In Windows PowerShell script  you could just type  PS  gt   os   get-wmiobject win32 operatingsystem PS  gt   os ConvertToDateTime  os InstallDate  -f  quot MM dd yyyy quot    By using WMI  Windows Management Instrumentation  If you do not use WMI  you must read then convert the registry value  PS  gt   path    HKLM  SOFTWARE Microsoft Windows NT CurrentVersion  PS  gt   id   get-itemproperty -path  path -name InstallDate PS  gt   d   get-date -year 1970 -month 1 -day 1 -hour 0 -minute 0 -second 0    add to hours  GMT offset     to get the timezone offset programatically     get-date -f zz PS  gt    d AddSeconds  id InstallDate   ToLocalTime   AddHours  get-date -f zz   -f  quot MM dd yyyy quot   The rest of this post gives you other ways to access that same information  Pick your poison     In VB Net that would give something like  Dim dtmInstallDate As DateTime Dim oSearcher As New ManagementObjectSearcher  quot SELECT   FROM Win32 OperatingSystem quot   For Each oMgmtObj As ManagementObject In oSearcher Get     dtmInstallDate           ManagementDateTimeConverter ToDateTime CStr oMgmtO bj  quot InstallDate quot     Next   In Autoit  a Windows scripting language   that would be   Windows Install Date    readreg   RegRead  quot HKLM SOFTWARE MICROSOFT WINDOWS NT CURRENTVERSION  quot    quot InstallDate quot    sNewDate    DateAdd   s   readreg   quot 1970 01 01 00 00 00 quot   MsgBox  4096   quot  quot    quot Date   quot   amp   sNewDate   Exit   In Delphy 7  that would go as  Function GetInstallDate  String  Var   di  longint    buf  Array   0  3   Of byte  Begin   Result     Unknown     With TRegistry Create Do   Begin     RootKey    HKEY LOCAL MACHINE      LazyWrite    True      OpenKey     SOFTWARE Microsoft Windows NT CurrentVersion   False        di    readbinarydata    InstallDate   buf  sizeof   buf            Result    DateTimeToStr   FileDateToDateTime   buf   0     buf   1     256   buf   2     65535   buf   3     16777216      showMessage inttostr di        Free    End  End    As an alternative  CoastN proposes in the comments   As the system ini-file stays untouched in a typical windows deployment  you can actually get the install-date by using the following oneliner   PowerShell    Get-Item  quot C  Windows system ini quot   CreationTime

User · Answer

Windows 10 OS has yet another registry subkey  this one in the SYSTEM hive file    Computer HKEY LOCAL MACHINE SYSTEM Setup    The Install Date information here is the original computer OS install date time  It also tells you when the update started  ie   Computer HKEY LOCAL MACHINE SYSTEM Setup Source OS  Updated on xxxxxx      This may of course not be when the update ends  the user may choose to turn off instead of rebooting when prompted  etc     The update can actually complete on a different day  and  Computer HKEY LOCAL MACHINE SYSTEM Setup Source OS  Updated on xxxxxx     will reflect the date time it started the update

[windows] How do I find the install time and date of Windows?

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