var year ='2013'; 
 var month ='04'; 
 var day ='18'; 

 var hours ='12'; 
 var min ='35'; 

 var reserv = new Date（year，month，day，hour，min）

 console.log（reserv）; 
 

您可能希望通过检查当前日期为自己获取的年，月和日值。这纯粹是为了显示如何将字符串转换为日期。

使用 reserv.getTime（）转换到毫秒的时间，因此能够比较两次;

  reserv.getTime（） -  reserv2.getTime（）
 

有关详细信息，请查看 MDN 。

My friend and I are doing a school project; the task is to make a room-reservation-site. This is our first year trying JavaScript, and we want a string to be formatted into time (h:m). The user of our room-reservation-site can choose what time of the day he/she wants the room, and the output is: H:m (24hour-clock:minutes). For example 12:15.

Therefor my question is: Is there possible to convert this string (h:m) into time, and easily check if the user typed more than 30minutes of booking-time? So we can for example say:

 if(start_of_reservation < start_of_reservation(+30minutes)){ 
   alert("You need to book a room atleast 30minutes"); }

 else if(start_of_reservation > start_of_reservation(+6hours)){ 
   alert("You can't book a room longer than 6 hours"); }

 else {
 // moving on..
 }

var year = '2013';
var month = '04';
var day = '18';

var hour = '12';
var min = '35';

var reserv = new Date(year,month,day,hour,min)

console.log(reserv);

Those year, month and day values you might want to fetch for yourselves by checking the current date. This is purely to show how to convert the string into a date.

Use reserv.getTime() to convert to milliseconds time and thus being able to compare two times;

reserv.getTime() - reserv2.getTime()

For more information, check the MDN.