[boost] Re: [date_time] enabling microsec_clock under C++Builder

From: Russell Hind (rhind_at_[hidden])
Date: 2003-03-27 10:26:14

Johan Nilsson wrote:
> 
> Perhaps, but one should consider that GetSystemTime promises 1ms resolution
> and delivers 10-15ms (and, IIRC,  that GetSystemTimeAsFileTime promises
> 250ns resolution).
> 

The Platform SDK states that the tickcount (GetTickCount) is updated 
every 10ms on NT3.51 and hight so I guess that GetSystemTime is updated 
at this interval also.

FileTimes are measured in 100 nanosecond intervals since 1 January, 
1601, but are you sure that GetSystemTimeAsFileTime will return a value 
that is updated at 250ns intervals?  I can't find anything in the SDK to 
say what the update interval is for the SystemTime, I'm just guessing 
that it is updated when the tick count is.

Cheers

Russell