The LogonHours property specifies the times during the week when the user can log on. Each bit represents a unit of time ...

The LogonHours property specifies the times during the week when the user can log on. Each bit represents a unit of time specified by the UnitsPerWeek member. For instance, if the unit of time is hourly, the first bit (bit 0, word 0) is Sunday, 0:00 to 0:59; the second bit (bit 1, word 0) is Sunday, 1:00 to 1:59; and so on.  If this member is set to NULL, then there is no time restriction.  The time is set to GMT and must be adjusted for other time zones (for example, GMT minus 8 hours for PST).