function ConvertToDateTime(srcChromeBookmarkDate) { //Hp --> The base date which google chrome considers while adding bookmarks var baseDate = new Date(1601, 0, 1); //Hp --> Total number of seconds in a day. var totalSecondsPerDay = 86400; //Hp --> Read total number of days and seconds from source chrome bookmark date. var quotient = Math.floor(srcChromeBookmarkDate / 1000000); var totalNoOfDays = Math.floor(quotient / totalSecondsPerDay); var totalNoOfSeconds = quotient % totalSecondsPerDay; //Hp --> Add total number of days to base google chrome date. var targetDate = new Date(baseDate.setDate(baseDate.getDate() + totalNoOfDays)); //Hp --> Add total number of seconds to target date. return new Date(targetDate.setSeconds(targetDate.getSeconds() + totalNoOfSeconds)); } var myDate = ConvertToDateTime(13236951113528894); // <<< Arbitrary Value <<<< alert(myDate);