Given the following inputs/restrictions, one may want to compute the end date and time of a project:
1. Start date and time of the project; and
2. Official working hours; and
3. Lunch breaks hours
Furthermore, to add to the complication, one may have different National holidays and weekend days i.e. while for some, the weekend days may be Saturday and Sunday, for others it may be Friday and Saturday.
You may refer to both my solutions here
1. Given National holidays and where Saturday and Sunday are the weekend days - Download workbook. This solution will work in all Excel versions
2. Given National holidays and where Friday and Saturday are the weekend days - Download workbook. This solution will work only in Excel 2010 and higher versions.