If in the User Preference window, the Dates-> Time option is set to “Do not show time”, then P6’s schedule calculation of Total Float values could be incorrectly calculated when a date is entered in the Project –> Schedule Date –> Must Finish By textbox.
When time is not shown and a date is entered in the Must Finish by textbox, the time stored by default is: 00H: 00M. This means that the date shown will not be considered during P6’s schedule calculations during the backward pass. This oversight causes every Total Float value to be 1 day less than the correct Total Float value.
In the illustration below, the “Analysis Charts 1 of 2” reports 4 activities with negative float even though the “Must Finish By” date matches the Contract Completion Milestone in the schedule.
Zümmer’s Analysis Charts, Analysis Statistics and Project Settings reports provide the red alert message “Possible Bad Planned End Date – Check Planned End Date Hours” under the Planned End box when the “Must Finish By” constraint date contains “00H: 00M” as the time value.
When this situation occurs, first return to the User Preferences window then change the Time option setting to either “12 Hour (1:30 PM)” or “24 Hour (13:30)”.
Second, return to the Projects-> Dates option. the “Must Finish By” option will now show with the Hours, Minutes as “00:00”.
Then change the hours and minutes setting to reflect the ending hour and minutes settings for the Project (typically 17:00/5:00 PM or 16:00/4:00 PM) as shown below.
Lastly, recalculate the Project as normal. The resulting Total Float values will now correctly include the Finish date during the backward pass process.
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