.net - Date.TryParse incorrect results -

-

when using date.tryparse, why string input of "2015-03-02-01" succeed during conversion string date, result of "3/1/2015 8:00:00 pm"? using vs2013 targeting .net 4.0.

i expect date.tryparse return false in case.

if did succeed, expect return either

  1. "3/2/2015" ignoring final "-01"
  2. "3/1/2015 11:00:00 pm" if treated final "-01" minus 1 hour "2015-03-02"
  3. "3/1/2015 7:00:00 pm" if treated final "-01" minus 1 hour , applied current eastern daylight time utc offset of -4 well.

any idea of going on here internally cause return "3/1/2015 8:00:00 pm"?

here test case: 

<testmethod()> public sub testdatetryparse()     dim s string = "2015-03-02-01"     dim d date     if date.tryparse(s, d)         assert.fail("date parsed when should have failed. input: ""{0}"", output: ""{1}""", s, d)     end if end sub

test result message: assert.fail failed. date parsed when should have failed. input: "2015-03-02-01", output: "3/1/2015 8:00:00 pm"

the string interpreted 2015-03-02 @ timezone -01.

the documentation datetime.tryparse has say:

if s contains no time zone information, result contains datetime value kind property datetimekind.unspecified when method returns. if string parsed contains time zone information, result contains datetime value kind property datetimekind.local when method returns.

so, normal date string 2015-03-02, when parse using datetime.tryparse(), see date's kind property datetimekind.unspecified documented.

but if check kind property in funny case, see give datetimekind.local, indicating parsing operation detected timezone information.

so happens in case your local timezone must -05. (edit: or more precisely, was -05 on 2015-03-02. because of daylight savings time, current timezone may different, timezone matters 1 in effect on 2015-03-02) when parses 2015-03-02-01, here does:

  • interpret 2015-03-02-01 2015-03-02 12:00:00 am @ timezone -01
  • convert 2015-03-02 12:00:00 am @ timezone -01 local timezone -05: 2015-03-01 08:00:00 pm

Comments

Post a Comment

Popular posts from this blog

yii2 - Yii 2 Running a Cron in the basic template -

-
i have seen instructions on running cron in advanced template, cant figure out how on basic template. have following controller in basic controllers folder. <?php namespace app\controllers; use yii\console\controller; /** * cron controller */ class croncontroller extends controller { public function actionindex() { echo "cron service runnning"; } public function actionmail($to) { echo "sending mail " . $to; } } i have navigated root of application , tried these comands yii cron php yii cron im getting unknown comand "cron" i know old question failed find actual answer this. if @ code yii exec file you'll notice requires /common/config/aliases.php file console/config/main.php. can naturally change these or copy on these advanced template. hope solves problem wanting same thing.
Read more

asp.net - 'System.Web.HttpContext' does not contain a definition for 'GetOwinContext' Mystery -

-
i realize question might seem trivial some, it's these types of things find myself fighting quite bit , want make sense of despite seeming losing battle in .net (for me anyway). so, if following: using system.web; ... applicationuser user = system.web.httpcontext.getowincontext().getusermanager<applicationusermanager>().findbyid(system.web.httpcontext.user.identity.getuserid()); that produces error in title , red getowincontext() , error cannot resolve symbol 'getowincontext()' however, if following (remove system.web in front of httpcontext ), works expected (or @ least no errors): using system.web; ... applicationuser user = httpcontext.getowincontext().getusermanager<applicationusermanager>().findbyid(system.web.httpcontext.user.identity.getuserid()); however, if (same line that's working using system.web commented out): //using system.web; ... applicationuser user = httpcontext.getowincontext().getusermana
Read more

c# - MSDN OneNote Api: Navigate to never before opened page without opening a OneNote Application Window -

-
my goal able use c# programmatically open .one section file , of section's page ids. in simple case (one have created , used section), can done following code: using microsoft.office.interop.onenote; class program { public static void processonenotefile() { application onenoteapp = new application(); string filepath = @"c:\users\admin\documents\onenote notebooks\my notebook\testsection.one"; string sectionid; onenoteapp.openhierarchy(filepath, null, out sectionid); string hierarchy; onenoteapp.gethierarchy(sectionid, hierarchyscope.hspages, out hierarchy); file.writealltext(@"c:\hierarchy.txt", hierarchy); } } from here can parse xml find pageids , go. the problem, however, want files getting else , have never opened before. when run same code on files, cannot find pageids in hierarchy, , therefore, cannot process pages. fix seems work use navigateto method open section file in onenot
Read more