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digitalmars.D.learn - print yyyy-mm-dd

reply "Suliman" <evermind live.ru> writes:
I can't understand how to get date in format yyyy-MM-dd from 
Clock.currTime
auto time = Clock.currTime;

And what next? Could anybody give any examples?
Nov 20 2014
parent reply "MrSmith" <mrsmith33 yandex.ru> writes:
On Thursday, 20 November 2014 at 13:50:49 UTC, Suliman wrote:

 I can't understand how to get date in format yyyy-MM-dd from 
 Clock.currTime
 auto time = Clock.currTime;

 And what next? Could anybody give any examples?


http://dpaste.dzfl.pl/73c0438f9d1e

currTime returns SysTime;
You can then cast is to Date.
And Date has toISOExtString which converts Date to a string with 
the format YYYY-MM-DD.
Nov 20 2014
parent reply "uri" <uri.grill gmail.com> writes:
On Thursday, 20 November 2014 at 20:38:08 UTC, MrSmith wrote:

 On Thursday, 20 November 2014 at 13:50:49 UTC, Suliman wrote:

 I can't understand how to get date in format yyyy-MM-dd from 
 Clock.currTime
 auto time = Clock.currTime;

 And what next? Could anybody give any examples?


 http://dpaste.dzfl.pl/73c0438f9d1e

 currTime returns SysTime;
 You can then cast is to Date.
 And Date has toISOExtString which converts Date to a string 
 with the format YYYY-MM-DD.


There's no need to cast, SysTime supports conversion to string

http://dlang.org/library/std/datetime/SysTime.toISOExtString.html
http://dlang.org/library/std/datetime/SysTime.toISOString.html

If you want just the YYYY-MM-DD slice it

Clock.currTime.toISOExtString[0..10].writeln;
Clock.currTime.toISOString[0..8].writeln;

Cheers,
uri
Nov 20 2014
parent reply "Suliman" <evermind live.ru> writes:
Is there any way to set separator? For example I want use '/' or 
':'?
Nov 24 2014
next sibling parent reply "Suliman" <evermind live.ru> writes:
And could anybody explain me how the cast is work. How to 
understand which types to which may be casted?
Nov 24 2014
parent Jonathan M Davis via Digitalmars-d-learn writes:
On Monday, November 24, 2014 10:38:55 Suliman via Digitalmars-d-learn wrote:

 And could anybody explain me how the cast is work. How to
 understand which types to which may be casted?


Look at the documentation for opCast. That's how the casting is done. But
what it comes down to is

SysTime -> DateTime, Date, or TimeOfDay
DateTime -> Date or TimeOfDay

Those are the conversions which lose information, so they can be done via
casts, whereas the conversions that would increase the amount of information
in the type require using a constructor, because you have to use information
from multiple objects to be able to create the new object. e.g.

auto dt = DateTime(date, tod);

The primary reason to cast a SysTime to a Date prior to calling
toISOExtString on it is to strip off the time portion, but slicing the
result as uri suggested works too (though it's probably a tad less efficient
due to the time spent creating the portion of the string that isn't even
used).

- Jonathan M Davis
Nov 24 2014
prev sibling parent Jonathan M Davis via Digitalmars-d-learn writes:
On Monday, November 24, 2014 10:33:16 Suliman via Digitalmars-d-learn wrote:

 Is there any way to set separator? For example I want use '/' or
 ':'?


No. toISOString and toISOExtString support the ISO and Extended ISO formats
from the ISO standard, and std.datetime does not currently support custom
date/time string formatting (though it's on the todo list). The only
non-standard format that it currently suports is Boost's "simple" time via
toSimpleString, and it probably shouldn't even be there, since it just
confuses things without adding any real, useful functionality. Custom
date/time string formatting is what's really needed for non-standard
representations, especially because everyone has a different way that they
want to represent the time. However, most code really should use
toISOExtString, since it's standard and reasonably readable (e.g.
2014-11-24T02:53:12 as opposed to the non-extended ISO format of
20141124T025312).

- Jonathan M Davis
Nov 24 2014