function formatNumber ( n ) { const formatString = n . toString ( ) ; return formatString [ 1 ] ? formatString : '0' + formatString ; } export function formatTime ( date ) { const year = date . getFullYear ( ) ; const month = date . getMonth ( ) + 1 ; const day = date . getDate ( ) ; const hour = date . getHours ( ) ; const minute = date . getMinutes ( ) ; const second = date . getSeconds ( ) ; return [ year , month , day ] . map ( formatNumber ) . join ( '/' ) + ' ' + [ hour , minute , second ] . map ( formatNumber ) . join ( ':' ) ; }