In Sep-2017 Keith Swenson who leads the efforts around DMN TCK, shared an interesting  post titled “A Strange FEELing about Dates“. In particular, he wrote: “The new expression language for Decision Model and Notation standard is called the Friendly Enough Expression Language (FEEL).  Over all it is a credible offering, and one that is much needed in decision modeling where no specific grammar has emerged as the standard.   But I found the handling of date and time values a bit odd.” Keith gives a few specific examples and is surprised that FEEL provides new ways to handle dates instead of borrowing from something that has been shown to work for years (like Java).  If you have “strange feelings” about some other features included in DMN FEEL, you may comment on them here and/or raise issues at the OMG website http://issues.omg.org/issues/create-new-issue.