Add today() function that your can use in expressions

[andrewtelnov]

today([value:number]) function returns the current date. It has an optional parameter, a number that will be added as days to the current date.
For example:
"today()" - will return the current date 0 hours, 0 minutes
"today(1)" will return tommorow
"today(-1) will return yesterday
"today(2) will return after tomorrow and so on.