W32TM.exe – Windows CMD Command

Time Service Utility.

The W32Time service is not a full-featured Network Time Protocol (NTP) solution that meets time-sensitive needs.

By default the Windows Time service (w32time) will synchronize it’s time once per week.
This can be extended to daily by setting a Scheduled Task to start the service and run w32tm /resync.

The options /debug, /packetinfo and /ipprotocol are available from Windows Vista and above.

/stripchart /packetinfo – will output three timestamps – The first hex number is byte order reversed NTP date, followed by the ANSI date (number of days since 1st Jan 1601) followed by the date/time in readable/local format.

The option /ntpte – will output three timestamps – The first hex number is an NTTE date (as also understood by w32tm.exe /ntte ), followed by the ANSI date (number of days since 1st Jan 1601) followed by the date/time in readable/local format.

The option /ntte – will output two timestamps – first the ANSI date (number of days since 1st Jan 1601) followed by the date/time in readable/local format.

A computer that is a member of a domain is configured by default to synchronize from the domain hierarchy, manually-specified synchronization is most useful for the forest root of the domain or for computers that are not joined to a domain.

Public NTP servers:

  • NIST Internet Time Service time.nist.gov – part of the NIST Physical Measurement Laboratory, maintains the standard for frequency and time interval for the United States.
  • NTP Pool project pool.ntp.org (or “0.pool.ntp.org 1.pool.ntp.org 2.pool.ntp.org 3.pool.ntp.org”) a big virtual cluster of timeservers.
  • time.windows.com – Microsoft’s own time server (not particularly reliable).

Examples:

Set the local Windows Time client to point to two different time servers, one named time.nist.gov and another named pool.ntp.org

W32TM.exe /config /manualpeerlist:"time.nist.gov pool.ntp.org" /syncfromflags:manual /update

Check the Windows Time client configuration from a client computer running Windows 7 that has a host name of PC64

W32TM.exe /query /computer:PC64 /configuration

Convert an NTTE formatted date into a readable format, if using hex, prefix with 0x:

W32TM.exe /ntte 0x01cf070000000000

W32TM.exe /ntte 130330610798428160

Convert an NTP formatted date into a readable format, if using hex, prefix with 0x:

W32TM.exe /ntpte 0x72386aa6917c63d8

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