I am trying to set conditional formatting to colour a field if it does not display a day name, either: Monday, Tuesday, Wednesady, Thursday, Friday, Saturday or Sunday.
I have tried the not between function Monday to sunday to no avail.
I have 31 fields representing 31 days in the month and these are linked to month and year fields. so you get this in each fields: ="07" & " - " & [Month] & " - " & [Year] and then i get the day name by using this for each of the 31 days: =Format([Text253],"dddd").
However not all months have 31 days and where the last 3 day's in each month change (29,30,31) dependant on the month and I want to colour these days to make it obvious that they do noy exist in the relevant month for the booking calendar.
so using formatting on these last three days in each month to say: if not a day name coulour it.
unless this info comes from another system, its a strange way of going about it. normally you would just store the date as a single field - then you get numerous date functions to handle the dates
eg format(somedate,"dddd") generates the weekday name
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however, if you assemble your details to form a string
so eg 29/02/2011 then the function isdate will determine whether its a real date or not