How to get a microtime in Node js

Question

How can I get the most accurate time stamp in Node js   ps My version of Node js is 0 8 X and the node-microtime extension doesn t work for me  crash on install

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There s also https   github com wadey node-microtime    gt  var microtime   require  microtime    gt  microtime now   1297448895297028

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A rewrite to help quick understanding   const hrtime   process hrtime            0  is seconds   1  is nanoseconds  let nanoSeconds    hrtime 0    1e9    hrtime 1         1 second is 1e9 nano seconds console log  nanoSeconds       nanoSeconds     nanoSeconds   97760957504895  let microSeconds   parseInt   hrtime 0    1e6     hrtime 1     1e-3    console log  microSeconds      microSeconds     microSeconds  97760957504  let milliSeconds   parseInt   hrtime 0    1e3     hrtime 1     1e-6    console log  milliSeconds      milliSeconds     milliSeconds  97760957   Source  https   nodejs org api process html process process hrtime time

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new Date   getTime    This gives you a timestamp in milliseconds  which is the most accurate that JS will give you   Update  As stated by vaughan  process hrtime   is available within Node js - its resolution are nanoseconds and therefore its much higher  also this doesn t mean it has to be more exact   PS   Just to be clearer  process hrtime   returns you a tuple Array containing the current high-resolution real time in a  seconds  nanoseconds

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better   Number process hrtime   join

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The BigInt data type is supported since Node js 10 7 0   see also the blog post announcement   For these supported versions of Node js  the process hrtime  time   method is now regarded as  legacy   replaced by the process hrtime bigint   method      The bigint version of the process hrtime   method returning the current high-resolution real time in a bigint    const start   process hrtime bigint       191051479007711n  setTimeout      gt      const end   process hrtime bigint         191052633396993n    console log  Benchmark took   end - start  nanoseconds         Benchmark took 1154389282 nanoseconds    1000       tl dr   Node js 10 7 0  - Use process hrtime bigint   Otherwise - Use process hrtime

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process hrtime   not give current ts   This should work    const loadNs         process hrtime            loadMs         new Date   getTime            diffNs         process hrtime loadNs           microSeconds    loadMs   1e6     diffNs 0    1e9    diffNs 1     console log microSeconds   1e3

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there are npm packages that bind to the system gettimeofday   function  which returns a microsecond precision timestamp on Linux   Search for npm gettimeofday   Calling C is faster than process hrtime

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To work with more precision than Date now    but with milliseconds in float precision   function getTimeMSFloat         var hrtime   process hrtime        return   hrtime 0    1000000   hrtime 1    1000     1000

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I m not so proud about this solution but you can have timestamp in microsecond or nanosecond in this way   const microsecond        gt  Number Date now     String process hrtime   1   slice 3 6   const nanosecond        gt  Number Date now     String process hrtime   1   slice 3       usage microsecond      return 1586878008997591 nanosecond       return 1586878009000645600     Benchmark with 100 000 iterations    Date now  7 758ms    microsecond  33 382ms    nanosecond  31 252ms   Know that    This solution works exclusively with node js   This is about 3 to 10 times slower than Date now   Weirdly  it seems very accurate  hrTime seems to follow exactly js timestamp ticks  You can replace Date now   by Number new Date    to get timestamp in milliseconds   Edit   Here a solution to have microsecond with comma  however  the number version will be rounded natively by javascript  So if you want the same format every time  you should use the String version of it   const microsecondWithCommaString        gt   Date now           String process hrtime   1   slice 3 7   const microsecondWithComma        gt  Number Date now           String process hrtime   1   slice 3 7    microsecondWithCommaString      return  1586883629984 8997  microsecondWithComma      return 1586883629985 966

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now  milli        120335360 999686 now  micro        120335360966 583 now  nano         120335360904333  Known that now is   const now    unit    gt         const hrTime   process hrtime         switch  unit             case  milli         return hrTime 0    1000   hrTime 1    1000000             case  micro         return hrTime 0    1000000   hrTime 1    1000             case  nano       default        return hrTime 0    1000000000   hrTime 1

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In Node js   high resolution time  is made available via process hrtime  It returns a array with first element the time in seconds  and second element the remaining nanoseconds   To get current time in microseconds  do the following   var hrTime   process hrtime   console log hrTime 0    1000000   hrTime 1    1000     Thanks to itaifrenkel for pointing out an error in the conversion above    In modern browsers  time with microsecond precision is available as performance now  See https   developer mozilla org en-US docs Web API Performance now for documentation   I ve made an implementation of this function for Node js  based on process hrtime  which is relatively difficult to use if your solely want to compute time differential between two points in a program  See http   npmjs org package performance-now   Per the spec  this function reports time in milliseconds  but it s a float with sub-millisecond precision   In Version 2 0 of this module  the reported milliseconds are relative to when the node process was started  Date now   -  process uptime     1000    You need to add that to the result if you want a timestamp similar to Date now    Also note that you should bever recompute Date now   -  process uptime     1000   Both Date now and process uptime are highly unreliable for precise measurements   To get current time in microseconds  you can use something like this   var loadTimeInMS   Date now   var performanceNow   require  performance-now   console log  loadTimeInMS   performanceNow      1000    See also  Does JavaScript provide a high resolution timer

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Node js nanotimer  I wrote a wrapper library object for node js on top of the process hrtime function call   It has useful functions  like timing synchronous and asynchronous tasks  specified in seconds  milliseconds  micro  or even nano  and follows the syntax of the built in javascript timer so as to be familiar   Timer objects are also discrete  so you can have as many as you d like  each with their own setTimeout or setInterval process running     It s called nanotimer  Check it out

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Get hrtime as single number in one line   const begin   process hrtime           Do the thing you want to measure const nanoSeconds   process hrtime begin  reduce  sec  nano    gt  sec   1e9   nano    Array reduce  when given a single argument  will use the array s first element as the initial accumulator value  One could use 0 as the initial value and this would work as well  but why do the extra   0

[javascript] How to get a microtime in Node.js?

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