MS Project calculation of end date

[kerryger]

I would be grateful if someone can help me - I am entering tasks in MS Project togther with duration in months, however when Project calculates the end date, it seems to cut it short. For example, start date = 15/4/2011, duration = 22 months but end date Project assigns is 20/12/2012....

Help please.
kerryger

[shoppingboy]

Hi, Not sure if this will help as my project knowledge is limited however I can offer an explanation that, by default, Project calculates a month as 20 working days. This means that it sees your 22 'months' as actually 440 working days (22 x 20) and not a calendar month. Some calendar months have more than 20 working days, so when project schedules a new month every 20 working days the end date will appear sooner than expected. Have a look under Tools/Options/Calendar to see how many days project counts as a month.