Hey everyone, I’m excited to share more great news with you; a much-wanted feature is gradually rolling out for Advanced Formulas: the TODAY Input! 
With this update, you will now find the new Today input allowing you to use today’s date in a duration formula calculation for things like how long a task has been open (TODAY - Created On ) or how long until a task is due (Due Date - TODAY).
Here’s a few examples to get you started; copy & paste the following formulas into the Advanced tab:
Days left formula
Calculate the time between the task’s due date in relation to today.
Result in #d #h format or, if value is greater than a week, in #w #d
[[$DUE_DATE]] - [[$TODAY]]
Result in number of days in decimal format
( ( [[$DUE_DATE]] - [[$TODAY]] ) + 0 ) / 1440
Days open formula
Calculate the time between the task’s creation date in relation to today.
Result in #d #h format or, if value is greater than a week, in #w #d
[[$TODAY]]-[[$CREATED_ON]]
Result in number of days in decimal format
( ( [[$TODAY]]-[[$CREATED_ON]] ) + 0 ) / 1440
You can also find the Today input in the Basic formula editor too:
How will you use the new TODAY input in your formulas?