date pipe in angular is increasing the date by 1 code example

Example 1: pipe of date angular

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{{ dateObj | date }}               // output is 'Jun 15, 2015'
{{ dateObj | date:'medium' }}      // output is 'Jun 15, 2015, 9:43:11 PM'
{{ dateObj | date:'shortTime' }}   // output is '9:43 PM'
{{ dateObj | date:'mm:ss' }}       // output is '43:11'

Example 2: angular date pipe

// In Angular 
// Html
<p>{{myDate | date: 'dd-MM-yyyy'}}</p>
// Typescript
myDate: Date = new Date();