formatting date in templates

Is there a way to format Date objects as part of the #item# template syntax?

If we are talking about datatable - yes, it is possible
In columns configuration you can use

columns:[
    { map:"(date)#item#", format:webix.i18n.dateFormatStr }
]

map attribute converts the string property item to the date object, and format applies necessary formatting. ( you can use your own format of course )

the same can be done through raw templating as well

var myformat = webix.date.dataToStr("%m - %d");

columns:[
    { temlate:function(obj){
          var date = webix.i18n.dateFormatDate(obj.item); 
          return myformat(date);
       }
    }
]