I need a good project management calendar that allows me to schedule work and track hours. Any suggestions?

I'm working as a contractor and figured the easiest way to allow my manager to assign/track my hours is through a dynamic calendar.

The tool needs to do the following:
1. Allow my manager to update it with new assignments
2. Allow me to mark when I've completed the assignments and how long it took
3. Allow me to block out dates/hours where I cannot accept work
4. IMPORTANT: Several people must be able to view the calendar at once and make live updates

Thanks, any help is much appreciated.
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Outlook can do that..

and is there a platform that you are looking to use?
eestephanyAuthor Commented:
Oh. I probably should have specified, it'd be best if it was cross-platform and could work on both Mac and Windows.
Do you have a Server that it can be hosted on?
If so.
Does it have IIS?
eestephanyAuthor Commented:
I decided that Google Calendars pretty much does exactly what I want in terms of a managing projects in  a calendar layout.
Thanks for the help anyways.

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Project Management Software

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