ask why the js console prints the result of console.log. If you don"t drop down the console.log, you can see 2018-12-28. After the drop-down, it becomes empty.
var today = new Date();
var date =
today.getFullYear() +
"-" +
(today.getMonth() + 1) +
"-" +
today.getDate() +
" 00:00";
this.activity.start_at = date;
console.log(this.activity);
the value still exists when printing, and then it is changed (usually the reference is not eliminated and modified)
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