• Steve Teale <steve.teale britseyeview.com> Nov 17 2010
• Kagamin <spam here.lot> Nov 17 2010
• Jonathan M Davis <jmdavisProg gmx.com> Nov 17 2010
• Steve Teale <steve.teale britseyeview.com> Nov 18 2010

Steve Teale <steve.teale britseyeview.com> writes:

Jonathan M Davis Wrote:

... (though in the case of adjusting for NTP, the internal stdTimes for the
SysTimes 
 would be off as well, while in the leap second case, they aren't).
 
 - Jonathan M Davis


OK, all, thanks for answering that question, but my primary gripe was that the
current std.date does not have a constructor like this(). My assumption being
that such a constructor would go to the OS and give you an object corresponding
to now.

I've looked at Jonathan's documentation, and I don't see a constructor like
that there either.

So if I want to write a timed log entry, what's the recommendation?

Steve

Kagamin <spam here.lot> writes:

Steve Teale Wrote:

 So if I want to write a timed log entry, what's the recommendation?


I won't dare to use std.date.

Jonathan M Davis <jmdavisProg gmx.com> writes:

On Wednesday 17 November 2010 21:35:03 Steve Teale wrote:
 Jonathan M Davis Wrote:
 
 ... (though in the case of adjusting for NTP, the internal stdTimes for the
 SysTimes
 
 would be off as well, while in the leap second case, they aren't).
 
 - Jonathan M Davis


 OK, all, thanks for answering that question, but my primary gripe was that
 the current std.date does not have a constructor like this(). My
 assumption being that such a constructor would go to the OS and give you
 an object corresponding to now.
 
 I've looked at Jonathan's documentation, and I don't see a constructor like
 that there either.
 
 So if I want to write a timed log entry, what's the recommendation?


Structs can't have default constructors, so it's impossible to do that. In the 
case of std.datetime, the way to get the current time is Clock.currTime(), and 
since SysTime has a toString() method, you can just print it. So, you can do 
writeln(Clock.currTime().toString()); It has other types of methods of 
converting to and from strings if you want a specific format, but toString() 
works just fine if you aren't picky about the format (it's also the most
readable 
of the various formats).

As for std.date.  IIRC, you'd use getUTCTime() to get the current time as a 
d_time and toUTCString() to print it. As I recall, anything that converts to or 
from UTC is broken, so I wouldn't advise it.

If you really want the current time as local time and don't want to use 
std.datetime before it's actually in Phobos, then I'd advise just using the 
standard C functions. They're in core.stdc.time. The list can be found here: 
http://www.cppreference.com/wiki/chrono/c/start

This program would print the current time:

import core.stdc.time;
import std.conv;
import std.stdio;
import std.string;

void main()
{
    auto t = time(null);
    writeln(strip(to!string(ctime(&t))));
}


to!string() is used because ctime() returns a char*, and strip() is used
because 
ctime() returns a string with a newline at the end.
 
- Jonathan M Davis

Steve Teale <steve.teale britseyeview.com> writes:

On Wed, 17 Nov 2010 22:18:09 -0800, Jonathan M Davis wrote:

 Structs can't have default constructors, so it's impossible to do that.
 In the case of std.datetime, the way to get the current time is
 Clock.currTime(), and since SysTime has a toString() method, you can
 just print it. So, you can do writeln(Clock.currTime().toString()); It
 has other types of methods of converting to and from strings if you want
 a specific format, but toString() works just fine if you aren't picky
 about the format (it's also the most readable of the various formats).
 
  
 - Jonathan M Davis


Ah! It was Clock.currTime() that I had not spotted.

Thanks Jonathan