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Full Discussion: Resetting date
Top Forums Shell Programming and Scripting Resetting date Post 302210657 by jim mcnamara on Tuesday 1st of July 2008 02:21:58 PM
Old 07-01-2008
unix time is kept by the kernel as 'epoch' seconds elapsed since Jan 1, 1970. All of the date functions and commands reference epoch seconds. You cannot set epoch seconds for one process. You can only trick some commands into thinking you are in a weird timezone, so that you can "go" backwards/forwards as much as 24 hours. No more because the length of a day is 24 hours. And you are not changing epoch seconds, just how they are interpreted.
 

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Tcl_GetTime(3TCL)					      Tcl Library Procedures						 Tcl_GetTime(3TCL)

__________________________________________________________________________________________________________________________________________________

NAME
Tcl_GetTime - get date and time SYNOPSIS
#include <tcl.h> Tcl_GetTime( timePtr ) ARGUMENTS
Tcl_Time * timePtr (out) Points to memory in which to store the date and time information. _________________________________________________________________ DESCRIPTION
The Tcl_GetTime function retrieves the current time as a Tcl_Time structure in memory the caller provides. This structure has the follow- ing definition: typedef struct Tcl_Time { long sec; long usec; } Tcl_Time; On return, the sec member of the structure is filled in with the number of seconds that have elapsed since the epoch: the epoch is the point in time of 00:00 UTC, 1 January 1970. This number does not count leap seconds - an interval of one day advances it by 86400 seconds regardless of whether a leap second has been inserted. The usec member of the structure is filled in with the number of microseconds that have elapsed since the start of the second designated by sec. The Tcl library makes every effort to keep this number as precise as possible, subject to the limitations of the computer system. On multiprocessor variants of Windows, this number may be limited to the 10- or 20-ms granularity of the system clock. (On single-processor Windows systems, the usec field is derived from a performance counter and is highly precise.) SEE ALSO
clock KEYWORDS
date, time ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWTcl | +--------------------+-----------------+ |Interface Stability | Uncommitted | +--------------------+-----------------+ NOTES
Source for Tcl is available on http://opensolaris.org. Tcl 8.4 Tcl_GetTime(3TCL)
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