change datetime format in angular 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: show timestamp as yyyy mm dd html angular

{{date  | date:'yyyy-MM-dd'}}