Fastest method of building a timestamp of the current hour

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?

asked Nov 14 '18 at 23:32

cdarwin

1,51272952

add a comment |

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?

asked Nov 14 '18 at 23:32

cdarwin

1,51272952

add a comment |

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?

asked Nov 14 '18 at 23:32

cdarwin

1,51272952

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

asked Nov 14 '18 at 23:32

cdarwin

1,51272952

asked Nov 14 '18 at 23:32

cdarwin

1,51272952

asked Nov 14 '18 at 23:32

cdarwin

1,51272952

asked Nov 14 '18 at 23:32

cdarwin

1,51272952

asked Nov 14 '18 at 23:32

cdarwin

1,51272952

add a comment |

2 Answers
2

active

oldest

votes

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);

edited Nov 14 '18 at 23:47

answered Nov 14 '18 at 23:41

Jeff

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

add a comment |

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() );

answered Nov 14 '18 at 23:36

Snowmonkey

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

add a comment |

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

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);

edited Nov 14 '18 at 23:47

answered Nov 14 '18 at 23:41

Jeff

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

add a comment |

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);

edited Nov 14 '18 at 23:47

answered Nov 14 '18 at 23:41

Jeff

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

add a comment |

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);

edited Nov 14 '18 at 23:47

answered Nov 14 '18 at 23:41

Jeff

6,34911025

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);

edited Nov 14 '18 at 23:47

answered Nov 14 '18 at 23:41

Jeff

6,34911025

edited Nov 14 '18 at 23:47

answered Nov 14 '18 at 23:41

Jeff

6,34911025

answered Nov 14 '18 at 23:41

Jeff

6,34911025

answered Nov 14 '18 at 23:41

Jeff

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

add a comment |

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

add a comment |

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() );

answered Nov 14 '18 at 23:36

Snowmonkey

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

add a comment |

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() );

answered Nov 14 '18 at 23:36

Snowmonkey

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

add a comment |

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() );

answered Nov 14 '18 at 23:36

Snowmonkey

3,07211012

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() );

answered Nov 14 '18 at 23:36

Snowmonkey

3,07211012

answered Nov 14 '18 at 23:36

Snowmonkey

3,07211012

answered Nov 14 '18 at 23:36

Snowmonkey

3,07211012

answered Nov 14 '18 at 23:36

Snowmonkey

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

add a comment |

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

add a comment |

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