The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Planck time
$t_{\rm P}$
 Value  5.391 24 x 10-44 s
 Standard uncertainty  0.000 27 x 10-44 s
  Relative standard uncertainty   5.0 x 10-5
 Concise form  5.391 24(27) x 10-44 s    
 
Click here for correlation coefficient of this constant with other constants
Source: 2006 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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