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High Resolution Time API

Method to provide the current time in sub-millisecond resolution and such that it is not subject to system clock skew or adjustments. Called using performance.now()

Spec https://www.w3.org/TR/hr-time/
Status W3C Recommendation
IE Edge Firefox Chrome Safari Opera
      108    
    107 107 TP  
    106 106 16.1  
11 105 105 105 16.0 91
10 104 104 104 15.6 90
9 103 103 103 15.5 89
8 102 102 102 15.4 88
Show all
7 101 101 101 15.2-15.3 87
6 100 100 100 15.1 86
5.5 99 99 99 15 85
  98 98 98 14.1 84
  97 97 97 14 83
  96 96 96 13.1 82
  95 95 95 13 81
  94 94 94 12.1 80
  93 93 93 12 79
  92 92 92 11.1 78
  91 91 91 11 77
  90 90 90 10.1 76
  89 89 89 10 75
  88 88 88 9.1 74
  87 87 87 9 73
  86 86 86 8 72
  85 85 85 7.1 71
  84 84 84 7 70
  83 83 83 6.1 69
  81 82 81 6 68
  80 81 80 5.1 67
  79 80 79 5 66
  18 79 78 4 65
  17 78 77 3.2 64
  16 77 76 3.1 63
  15 76 75   62
  14 75 74   60
  13 74 73   58
  12 73 72   57
    72 71   56
    71 70   55
    70 69   54
    69 68   53
    68 67   52
    67 66   51
    66 65   50
    65 64   49
    64 63   48
    63 62   47
    62 61   46
    61 60   45
    60 59   44
    59 58   43
    58 57   42
    57 56   41
    56 55   40
    55 54   39
    54 53   38
    53 52   37
    52 51   36
    51 50   35
    50 49   34
    49 48   33
    48 47   32
    47 46   31
    46 45   30
    45 44   29
    44 43   28
    43 42   27
    42 41   26
    41 40   25
    40 39   24
    39 38   23
    38 37   22
    37 36   21
    36 35   20
    35 34   19
    34 33   18
    33 32   17
    32 31   16
    31 30   15
    30 29   12.1
    29 28   12
    28 27   11.6
    27 26   11.5
    26 25   11.1
    25 24   11
    24 23 (*)   10.6
    23 22 (*)   10.5
    22 21 (*)   10.0-10.1
    21 20 (*)   9.5-9.6
    20 19   9
    19 18    
    18 17    
    17 16    
    16 15    
    15 14    
    14 13    
    13 12    
    12 11    
    11 10    
    10 9    
    9 8    
    8 7    
    7 6    
    6 5    
    5 4    
    4      
    3.6      
    3.5      
    3      
    2      
Safari on iOS Opera Mini Android Browser Blackberry Browser Opera Mobile Android Chrome Android Firefox IE Mobile Android UC Browser Samsung Internet QQ Browser Baidu Browser KaiOS Browser
16.1                        
16.0 all 105 10 64 105 104 11 13.4 18.0 13.1 13.18 2.5
15.6   4.4.3-4.4.4 7 12.1     10   17.0      
15.5   4.4   12         16.0      
15.4   4.2-4.3   11.5         15.0      
Show all
15.2-15.3   4.1   11.1         14.0      
15.0-15.1   4   11         13.0      
14.5-14.8   3   10         12.0      
14.0-14.4   2.3             11.1-11.2      
13.4-13.7   2.2             10.1      
13.3   2.1             9.2      
13.2                 8.2      
13.0-13.1                 7.2-7.4      
12.2-12.5                 6.2-6.4      
12.0-12.1                 5.0-5.4      
11.3-11.4                 4      
11.0-11.2                        
10.3                        
10.0-10.2                        
9.3                        
9.0-9.2                        
8.1-8.4                        
8                        
7.0-7.1                        
6.0-6.1                        
5.0-5.1                        
4.2-4.3                        
4.0-4.1                        
3.2                        

Notes

The timestamp is not actually high-resolution. To mitigate security threats such as Spectre, browsers currently round the result to varying degrees.

  1. In Firefox, the "privacy.reduceTimerPrecision" preference is enabled by default and defaults to 20us in Firefox 59; in 60 it will be 2ms.

  2. In Firefox, the "privacy.resistFingerprinting" preference changes the precision to 100ms or the value of "privacy.resistFingerprinting.reduceTimerPrecision.microseconds", whichever is larger.

* Partial support with prefix.

Bugs

  • Older versions of Chrome and Opera on Windows have only millisecond precision. The fractional part is always near the very start or the very end of a millisecond. (issue #158234).

  • The Spy in the Sandbox vulnerability is a class of JavaScript-based exploits that leverage the High Resolution Time API to detect CPU cache hit/miss on chosen plaintext data placed into cache by an attacker. Full security research paper is here

Resources

Data by caniuse.com
Licensed under the Creative Commons Attribution License v4.0.
https://caniuse.com/high-resolution-time