JavaScript で PHP の strtotime() を実装する

strtotime()

/**
 * 日付文字列を時刻値 (ミリ秒)に変換
 * 
 * @param  {string} d
 * @return {number}
 */
function strtotime( d ) {
  return new Date( d ).getTime();
}

使ってみる

let timeA = strtotime( "Tue Aug 08 2017 00:00:00 GMT+0900 (JST)" );
let timeB = strtotime( "Wed Aug 09 2017 00:00:00 GMT+0900 (JST)" );

console.log( timeA );
console.log( timeB );
console.log( typeof timeA );

if ( timeA > timeB )
  console.log( 'timeA is latest.' );
else
  console.log( 'timeB is latest.' );


/*
1502118000000
1502204400000
number
timeB is latest.
*/