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Calculate the date a week later Create a formula date type field which displays the date that's a week later than the value in the Start Date field. Dates [Start Date] + Days (7) Take the value in the Start Date field and add seven days to it. Date     More on this solution...
Calculate a task's finish date, based on the start date and number entered in the Estimated # of Days field. Adding a numeric value (Estimated # of Days) to a date value doesn't work. Type Conversion [Actual Start Date]+ Days([Estimated # of days]) Convert the number in the Estimated # of days field into a duration that represents a number of days and add it to the Actual Start Date. Date The Days() function converts the numeric value into a Duration value.   More on this solution...
Find duration between two dates Find the length of time between the date a record is created and the date the record's marked complete. Dates ToDays([Actual Finish Date] - ToDate([Date Created])) Take the value in the Date Created field (Date / Time type field) and convert it to a date value. Then subtract that date from the Actual Finish Date. Convert the resulting duration to a number of days. Numeric You must convert the this formula result to days to make it data type numeric.

If your result field type if formula-duration instead try:
[Actual Finish Date] - ToDate([Date Created])
If both dates live in Date type fields you can use a much simpler formula: [Actual Finish Date] - [Start Date] More on this solution...
Find duration between a date and today Find the length of time between a date and the current day's date (today). This is handy for finding the number of days until a planned finish date, for example. Dates ToDays([Planned Finish Date] - Today()) Subtract today's date from the Planned Finish Date. Numeric If you want to display the result in a Duration type field instead, then you don't need the ToDays() function. Use this formula instead: 
[Planned Finish Date] - Today()
If your result field is a Duration type field, try this formula instead:  [Planned Finish Date] - Today() More on this solution...
Calculate the date one week from today   Dates Today() + Days(7) Display the date that is today plus 7 days. Date     More on this solution...
Show records for which events have occurred in the last week Show records where any one of several date fields contains a date that occurred in the last week Conditional (If - Then) If(ToDays(Today()-[Sales Presentation])<7,true,false) or 
If(ToDays(Today()-[Follow-Up Meeting (2)])<7,true,false) or
If(ToDays(Today()-[Follow-Up Meeting (3)])<7,true,false) or
If(ToDays(Today()-[Follow-Up Meeting (4)])<7,true,false) or
If(ToDays(Today()-[STR Meeting])<7,true,false)
If you subtract the date in the Sales Presentation field from today and it's greater than seven, turn the checkbox field on (true), otherwise turn it off (false). 

Each line of the formula beginning with "If" repeats these same conditions for each field listed. Each If/Then condition is joined by an "or" operator. This means that if the condition is met in any field, QuickBase will turn on the checkbox field.
Checkbox Use this formula to create a view. You can feature the checkbox field in the view to see which records have it checked and which don't. You can also use this custom formula field in the view's criteria. In other words, design the view so that you only see those records where this checkbox field is on. Read more about using custom columns in views here:   More on this solution...
Calculate the number of months that the date of last payment is past due I want to show the number of months overdue, but include complete months only, leaving off possible partial months. Dates Floor ( ToDays (Today() - [Date of Last Payment]) / 30) Subtract the Date of Last Payment from Today. ToDays converts that duration to a numeric value of days.  Divide that number by 30 and return the the number of complete months that have passed. Numeric Floor() function returns the largest integer that's less than the number in question. For example, Floor(2.4) would return 2. Likewise, Floor (2.7) would return 2.   More on this solution...
View records from the previous week only How do I create a view that on any day of the week I can view records dated from the previous week? Dates If([Date]>FirstDayOfWeek(Today()-Days(7)) and
[Date]< LastDayOfWeek(Today()-Days(7)), 
Subtract 7 days from today. Take the resulting date (let's call it "one week ago date") and calculate the first day of its week. If that is greater than the value in the Date field and If that date is less than the last day of the week in which "one week ago date" falls, the result is true (checkbox is on) otherwise the result is false (checkbox is off). Checkbox You  can create a formula - checkbox type field to hold this formula  or just use the formula within the report (view) builder page. In this case, also select checkbox as the type, then within the Matching Criteria section, specify that <custom column> is yes (type in the word yes).   More on this solution...

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When you bring additional fields into a conversion, Quick Base often finds inconsistencies. For example, say you're converting your Companies column into its own table. One company, Acme Corporation, has offices in New York, Dallas and Portland. So, when you add the City column to the conversion, Quick Base finds three different locations for Acme. A single value in the column you're converting can only match one value in any additional field. Quick Base needs you to clean up the extra cities before it can create your new table. To do so, you have one of two choices:

Read more about converting a column into a table.

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