Specify the day of the week to check for definition updates

This policy setting allows you to specify the day of the week on which to check for definition updates. The check can also be configured to run every day or to never run at all.

This setting can be configured with the following ordinal number values:
(0x0) Every Day (default)
(0x1) Sunday
(0x2) Monday
(0x3) Tuesday
(0x4) Wednesday
(0x5) Thursday
(0x6) Friday
(0x7) Saturday
(0x8) Never

If you enable this setting, the check for definition updates will occur at the frequency specified.

If you disable or do not configure this setting, the check for definition updates will occur at a default frequency.

Supported on: At least Windows Server 2012, Windows 8 or Windows RT
Specify the day of the week to check for definition updates


  1. Never
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Microsoft\Windows Defender\Signature Updates
    Value NameScheduleDay
    Value TypeREG_DWORD
    Value8
  2. Every Day
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Microsoft\Windows Defender\Signature Updates
    Value NameScheduleDay
    Value TypeREG_DWORD
    Value0
  3. Sunday
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Microsoft\Windows Defender\Signature Updates
    Value NameScheduleDay
    Value TypeREG_DWORD
    Value1
  4. Monday
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Microsoft\Windows Defender\Signature Updates
    Value NameScheduleDay
    Value TypeREG_DWORD
    Value2
  5. Tuesday
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Microsoft\Windows Defender\Signature Updates
    Value NameScheduleDay
    Value TypeREG_DWORD
    Value3
  6. Wednesday
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Microsoft\Windows Defender\Signature Updates
    Value NameScheduleDay
    Value TypeREG_DWORD
    Value4
  7. Thursday
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Microsoft\Windows Defender\Signature Updates
    Value NameScheduleDay
    Value TypeREG_DWORD
    Value5
  8. Friday
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Microsoft\Windows Defender\Signature Updates
    Value NameScheduleDay
    Value TypeREG_DWORD
    Value6
  9. Saturday
    Registry HiveHKEY_LOCAL_MACHINE
    Registry PathSoftware\Policies\Microsoft\Windows Defender\Signature Updates
    Value NameScheduleDay
    Value TypeREG_DWORD
    Value7


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