Inserting the Current Date

[lostruler]

Guys,

How can I create a line which will input (type) the current date (yyyy.MM.dd) when needed?

I tried creating a string:

str sf
sf.timeformat("yyyy.MM.dd")

But how can I type the result of my string (2015.01.14)?
sf.type ?????

Moreover, how can I subtract one month?

sf.timeformat("yyyy.MM-1.dd")??


Thank you for helping.