Re: [ROOT] TDatime and GMT

From: Juergen Hannappel (hannappe@physik.uni-bonn.de)
Date: Mon Jan 28 2002 - 18:15:01 MET


Christoph Bugel <chris@tti-telecom.com> writes:

> On Tue 2002-01-22, Fons Rademakers wrote:
> > Hi Hermann-Josef,

[...]

> > since there is a lot of interest for a general TTimeStamp class
> > with higher precision and all conversion possibilities I would
> > propose to adopt Robert Hatchers TTimeStamp class for this.
> 
> I don't use ROOT classes, but just out of interest in the subject
> I would like to add that in my view the correct (yeah, right)
> solution would be a Date class that represents a point in time in
> an absolute, zone-independant way (time_t will do), and it will

[...]

> it should probably hold a time_t plus a milisec as data members)

The prcision should be at least nanoseconds, as this gives no real
overhead if you consider that with more that 1 second resolution a
32Bit integer is not enough, so if you need another data member for
the sub-second part you could easily go to nanoseconds, which is
nowadys more than 2 CPU clock cycles.

Greetings,
	Juergebn
-- 
Dr. Juergen Hannappel          http://lisa2.physik.uni-bonn.de/~hannappe
mailto:hannappel@physik.uni-bonn.de  Phone: +49 228 73 2447 FAX ... 7869
Physikalisches Institut der Uni Bonn Nussallee 12, D-53115 Bonn, Germany     
CERN: Phone: +412276 76461 Fax: ..77930 Bat. 892-R-A13 CH-1211 Genève 23



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