IF({ExpireEnd},IF({ExpireEnd} = TODAY(),INT(0),INT(DATETIME_DIFF(

  {ExpireEnd},

  TODAY(),

  'days'))

), "")

When “ExpireEnd” field condition is equal today formula returns nothing empty, should return 0

INT(“0”) - with quotes same effect nothing.

when I put in formula just “0” - without INT() - its ok

Also work fine when I use any number other than zero