Fastest method of building a timestamp of the current hour












0















I'm looking for the fastest method to build a timestamp which represents the current hour starting from the current instant (in general, starting from a timestamp)



Currently I'm doing the following:






var d = new Date();

var year = d.getUTCFullYear();

var month = d.getUTCMonth();

var day = d.getUTCDate();

var hour = d.getUTCHours();

				

d = new Date(year, month, day, hour);

console.log(d);

console.log(d.getTime());





Is it possible to avoid the second invocation of Date?






javascript datetime







share|improve this question



























    0















    I'm looking for the fastest method to build a timestamp which represents the current hour starting from the current instant (in general, starting from a timestamp)



    Currently I'm doing the following:






    var d = new Date();
    
var year = d.getUTCFullYear();
    
var month = d.getUTCMonth();
    
var day = d.getUTCDate();
    
var hour = d.getUTCHours();
    
				
    
d = new Date(year, month, day, hour);
    
console.log(d);
    
console.log(d.getTime());





    Is it possible to avoid the second invocation of Date?






    javascript datetime







    share|improve this question

























      0












      0








      0








      I'm looking for the fastest method to build a timestamp which represents the current hour starting from the current instant (in general, starting from a timestamp)



      Currently I'm doing the following:






      var d = new Date();
      
var year = d.getUTCFullYear();
      
var month = d.getUTCMonth();
      
var day = d.getUTCDate();
      
var hour = d.getUTCHours();
      
				
      
d = new Date(year, month, day, hour);
      
console.log(d);
      
console.log(d.getTime());





      Is it possible to avoid the second invocation of Date?






      javascript datetime







      share|improve this question














      I'm looking for the fastest method to build a timestamp which represents the current hour starting from the current instant (in general, starting from a timestamp)



      Currently I'm doing the following:






      var d = new Date();
      
var year = d.getUTCFullYear();
      
var month = d.getUTCMonth();
      
var day = d.getUTCDate();
      
var hour = d.getUTCHours();
      
				
      
d = new Date(year, month, day, hour);
      
console.log(d);
      
console.log(d.getTime());





      Is it possible to avoid the second invocation of Date?






      var d = new Date();
      
var year = d.getUTCFullYear();
      
var month = d.getUTCMonth();
      
var day = d.getUTCDate();
      
var hour = d.getUTCHours();
      
				
      
d = new Date(year, month, day, hour);
      
console.log(d);
      
console.log(d.getTime());





      var d = new Date();
      
var year = d.getUTCFullYear();
      
var month = d.getUTCMonth();
      
var day = d.getUTCDate();
      
var hour = d.getUTCHours();
      
				
      
d = new Date(year, month, day, hour);
      
console.log(d);
      
console.log(d.getTime());





      javascript datetime




      javascript datetime






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 14 '18 at 23:32









      cdarwincdarwin

      1,51272952




      1,51272952
























          2 Answers
          2






          active

          oldest

          votes


















          1














          If I understand you correctly you want the timestamp of the beginning of the current hour. Then you could simply set the minutes and seconds to 0 in your first Date Object:



          var d = new Date();
          
d.setMinutes(0,0);
          
console.log(d);
          
console.log(d.getTime());


          You could make it a oneliner, since setMinutes() already returns a timestamp:



          var timestamp = new Date().setMinutes(0,0);





          share|improve this answer


























          • Is there a way to avoid calling date completely, if I start from a timestamp?

            – cdarwin
            Nov 14 '18 at 23:42











          • You would have to calculate the minutes+seconds from the given timestamp to subtract them. I don't know of an easier version.

            – Jeff
            Nov 14 '18 at 23:44



















          0














          Not sure why you're doing that twice, you really don't need to.






          var d = new Date();
          

          
console.log(d.getHours());
          
// or
          
console.log(d.getTime() );








          share|improve this answer
























          • I need a new timestamp, your solution doesn't seem to answer, d.getTime is the current instant not the instant at the beginning of the hour

            – cdarwin
            Nov 14 '18 at 23:40











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          2 Answers
          2






          active

          oldest

          votes








          2 Answers
          2






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          1














          If I understand you correctly you want the timestamp of the beginning of the current hour. Then you could simply set the minutes and seconds to 0 in your first Date Object:



          var d = new Date();
          
d.setMinutes(0,0);
          
console.log(d);
          
console.log(d.getTime());


          You could make it a oneliner, since setMinutes() already returns a timestamp:



          var timestamp = new Date().setMinutes(0,0);





          share|improve this answer


























          • Is there a way to avoid calling date completely, if I start from a timestamp?

            – cdarwin
            Nov 14 '18 at 23:42











          • You would have to calculate the minutes+seconds from the given timestamp to subtract them. I don't know of an easier version.

            – Jeff
            Nov 14 '18 at 23:44
















          1














          If I understand you correctly you want the timestamp of the beginning of the current hour. Then you could simply set the minutes and seconds to 0 in your first Date Object:



          var d = new Date();
          
d.setMinutes(0,0);
          
console.log(d);
          
console.log(d.getTime());


          You could make it a oneliner, since setMinutes() already returns a timestamp:



          var timestamp = new Date().setMinutes(0,0);





          share|improve this answer


























          • Is there a way to avoid calling date completely, if I start from a timestamp?

            – cdarwin
            Nov 14 '18 at 23:42











          • You would have to calculate the minutes+seconds from the given timestamp to subtract them. I don't know of an easier version.

            – Jeff
            Nov 14 '18 at 23:44














          1












          1








          1







          If I understand you correctly you want the timestamp of the beginning of the current hour. Then you could simply set the minutes and seconds to 0 in your first Date Object:



          var d = new Date();
          
d.setMinutes(0,0);
          
console.log(d);
          
console.log(d.getTime());


          You could make it a oneliner, since setMinutes() already returns a timestamp:



          var timestamp = new Date().setMinutes(0,0);





          share|improve this answer















          If I understand you correctly you want the timestamp of the beginning of the current hour. Then you could simply set the minutes and seconds to 0 in your first Date Object:



          var d = new Date();
          
d.setMinutes(0,0);
          
console.log(d);
          
console.log(d.getTime());


          You could make it a oneliner, since setMinutes() already returns a timestamp:



          var timestamp = new Date().setMinutes(0,0);






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 14 '18 at 23:47

























          answered Nov 14 '18 at 23:41









          JeffJeff

          6,34911025




          6,34911025













          • Is there a way to avoid calling date completely, if I start from a timestamp?

            – cdarwin
            Nov 14 '18 at 23:42











          • You would have to calculate the minutes+seconds from the given timestamp to subtract them. I don't know of an easier version.

            – Jeff
            Nov 14 '18 at 23:44



















          • Is there a way to avoid calling date completely, if I start from a timestamp?

            – cdarwin
            Nov 14 '18 at 23:42











          • You would have to calculate the minutes+seconds from the given timestamp to subtract them. I don't know of an easier version.

            – Jeff
            Nov 14 '18 at 23:44

















          Is there a way to avoid calling date completely, if I start from a timestamp?

          – cdarwin
          Nov 14 '18 at 23:42





          Is there a way to avoid calling date completely, if I start from a timestamp?

          – cdarwin
          Nov 14 '18 at 23:42













          You would have to calculate the minutes+seconds from the given timestamp to subtract them. I don't know of an easier version.

          – Jeff
          Nov 14 '18 at 23:44





          You would have to calculate the minutes+seconds from the given timestamp to subtract them. I don't know of an easier version.

          – Jeff
          Nov 14 '18 at 23:44













          0














          Not sure why you're doing that twice, you really don't need to.






          var d = new Date();
          

          
console.log(d.getHours());
          
// or
          
console.log(d.getTime() );








          share|improve this answer
























          • I need a new timestamp, your solution doesn't seem to answer, d.getTime is the current instant not the instant at the beginning of the hour

            – cdarwin
            Nov 14 '18 at 23:40
















          0














          Not sure why you're doing that twice, you really don't need to.






          var d = new Date();
          

          
console.log(d.getHours());
          
// or
          
console.log(d.getTime() );








          share|improve this answer
























          • I need a new timestamp, your solution doesn't seem to answer, d.getTime is the current instant not the instant at the beginning of the hour

            – cdarwin
            Nov 14 '18 at 23:40














          0












          0








          0







          Not sure why you're doing that twice, you really don't need to.






          var d = new Date();
          

          
console.log(d.getHours());
          
// or
          
console.log(d.getTime() );








          share|improve this answer













          Not sure why you're doing that twice, you really don't need to.






          var d = new Date();
          

          
console.log(d.getHours());
          
// or
          
console.log(d.getTime() );








          var d = new Date();
          

          
console.log(d.getHours());
          
// or
          
console.log(d.getTime() );





          var d = new Date();
          

          
console.log(d.getHours());
          
// or
          
console.log(d.getTime() );






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 14 '18 at 23:36









          SnowmonkeySnowmonkey

          3,07211012




          3,07211012













          • I need a new timestamp, your solution doesn't seem to answer, d.getTime is the current instant not the instant at the beginning of the hour

            – cdarwin
            Nov 14 '18 at 23:40



















          • I need a new timestamp, your solution doesn't seem to answer, d.getTime is the current instant not the instant at the beginning of the hour

            – cdarwin
            Nov 14 '18 at 23:40

















          I need a new timestamp, your solution doesn't seem to answer, d.getTime is the current instant not the instant at the beginning of the hour

          – cdarwin
          Nov 14 '18 at 23:40





          I need a new timestamp, your solution doesn't seem to answer, d.getTime is the current instant not the instant at the beginning of the hour

          – cdarwin
          Nov 14 '18 at 23:40


















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