TypeScript

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
  text-align: center;
}

TypeScript

var data ={"myjsonobject": [
{"custom_date":"2020-04-13"},
{"custom_date":"2020-04-19"},
{"custom_date":"2020-04-20"},
{"custom_date":"2020-04-21"}
]
};
console.log(data.myjsonobject);
var startDate = data.myjsonobject[0].custom_date;
var endDate = data.myjsonobject[data.myjsonobject.length-1].custom_date;
console.log(startDate);
console.log(endDate);