One of add-ons that launched yesterday was Date Add and Subtract
, a sample add-on we created on the Apps Script Developer Relations team. It provides a couple of custom functions for date manipulation and was built to show how you can move your custom functions scripts to the add-ons framework.
The full source code (there isn't much) is now available on GitHub: http://goo.gl/6N8Pdw
. There is a wealth of custom functions in the Script Gallery that we would love to see start moving to the add-on store, so get cracking and fill our the add-on application form (http://goo.gl/qBCs09
) when you've got something working.