Thread: [Cppcms-users] Parsing time from a string into date_time?

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Hi,

I was wondering if there's a facility to parse a string into date_time.
Strings such as

YYYY-MM-DD or YY-MM-DD or YYYY-DD-MM or DD/MM/YYYY and so on

Thanks!

Petr

Are you serious? 
Do you know Google, Bing, Yahoo etc? 
http://www.cplusplus.com/reference/clibrary/ctime/strftime/
....
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ele...@ex... schrieb:

Hi,

I was wondering if there's a facility to parse a string into date_time.
Strings such as

YYYY-MM-DD or YY-MM-DD or YYYY-DD-MM or DD/MM/YYYY and so on

Thanks!

Petr

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On Thursday, April 19, 2012 02:37:59 PM Marcel Hellwig wrote:
>  http://www.cplusplus.com/reference/clibrary/ctime/strftime/

If I understand well, this function provides a string from a time_t.
And if I understand well Petr's original request, he wants the opposite: get a 
time_t from a string.
I'm sure there's an easy solution somewhere, a simple third-party API.

In any case, there seem to be a relevant item in CPPCMS' roadmap, even if it's 
not what was requested either:
http://cppcms.com/wikipp/en/page/cppcms_1x_tasks#Implement.Locale.sensitive.Date-
Time.Form.Widgets
"Implement Locale sensitive Date-Time Form Widgets
ICU provides good features for parsing and formatting dates and times, 
implement Date-Time Widget for this purpose."

Blessings,

Augustin.

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.

To parse date-time read

http://www.boost.org/doc/libs/1_49_0/libs/locale/doc/html/formatting_and_parsing.html

Just change "boost" to "booster"

Note to parse booster::locale::date_time you need to compile CppCMS with ICU.

Otherwise you can use booster::ptime and std::tm <-> booster::ptime/time_t conversions.

http://cppcms.com/cppcms_ref/latest/classbooster_1_1ptime.html#a5d69b8e68c9847834ee984bfd19be8b5

> not what was requested either:
> http://cppcms.com/wikipp/en/page/cppcms_1x_tasks#Implement.Locale.sensitive.Date-
> Time.Form.Widgets
> "Implement Locale sensitive Date-Time Form Widgets
> ICU provides good features for parsing and formatting dates and times, 
> implement Date-Time Widget for this purpose."

Note this mostly related to forms/widgets. CppCMS supports date-time parsing.

Artyom Beilis
--------------
CppCMS - C++ Web Framework:   http://cppcms.com/
CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/

> 

On the other hand would this work? ( i don't have a C++ compiler on this
windows laptop to try it)

double t;
istringstream is("2001-12-12");

is >> as::ftime("%Y-%m-%d") >> t;

date_time dt(t);

Petr

Does this work for both string-to-date_time as wells as date_time-to-string?

I'm aware of strftime, and all, but that's in reverse. I'm looking for
something like time_input_facet that's in boost::posix_time allowing me to
parse a string/char into time.

Perhaps something like

istringstram ss("2001-12-12");
date_time dt;

ss >> format("%Y-%m-%d") >> dt;

would be really handy. The examples of date and time formatting on the
page you pointed out seem to only show output streams (date to string
formatting), but maybe I'm not seeing something obvious in which case I
apologize.

Cheers
Petr

> To parse date-time read
>
>
> http://www.boost.org/doc/libs/1_49_0/libs/locale/doc/html/formatting_and_parsing.html
>
> Just change "boost" to "booster"
>
> Note to parse booster::locale::date_time you need to compile CppCMS with
> ICU.
>

> 
> Does this work for both string-to-date_time as wells as date_time-to-string?
> 
> I'm aware of strftime, and all, but that's in reverse. I'm looking 
> for
> something like time_input_facet that's in boost::posix_time allowing me to
> parse a string/char into time.
> 
> Perhaps something like
> 
> istringstram ss("2001-12-12");
> date_time dt;
> 
> ss >> format("%Y-%m-%d") >> dt;
> 

It works, with manipulators:

ss >> booster::locale::as::ftime("%Y-%m-%d") >> dt;

It requires CppCMS to be compiled with ICU.

Artyom

Aaah excellent.

What happens if the time string doesn't match the format? ie. the
time/date is 2001/12/01 and ftime is set to %Y-%m-%d

Is there a way to check for such failure(ie. does it throw?)

Thanks!
Petr

> It works, with manipulators:
>
> ss >> booster::locale::as::ftime("%Y-%m-%d") >> dt;
>
> It requires CppCMS to be compiled with ICU.
>
> Artyom
>

>>  It works, with manipulators:
>> 
>>  ss >> booster::locale::as::ftime("%Y-%m-%d") >> dt;

> 
> Is there a way to check for such failure(ie. does it throw?)
> 

The error is reported as any error in istream parsing: failbit.

Read about error handling for C++ I/O stream

Artyom