Javascript Date issues returning 1 day less than set date - timezone -

-

date formatting issues javscript date().

background: i'm modifying jquery ui datepicker , having trouble months , dates returning incorrect values.

$('#datefield').datepicker({    beforeshowday: function(date) {       // issues experienced here - isolation test code below       // mon aug 01 2016 00:00:00 gmt+1000 (aus eastern standard time)       // datemonth: 8 - iso: 20160731    } })

based js date() construction on http://www.w3schools.com/jsref/jsref_obj_date.asp

sample code:

var d1 = new date(); var d1month = d1.getmonth()+1; var d1iso = d1.toisostring().slice(0,10).replace(/-/g,"");  console.log(d1); console.log('1month: '+d1month+' iso: '+d1iso);  var d2 = new date(2016,06,31); var d2month = d2.getmonth()+1; var d2iso = d2.toisostring().slice(0,10).replace(/-/g,"");  console.log(d2); console.log('2month: '+d2month+' iso: '+d2iso);  var d3 = new date('2016-07-31'); var d3month = d3.getmonth()+1; var d3iso = d3.toisostring().slice(0,10).replace(/-/g,"");  console.log(d3); console.log('3month: '+d3month+' iso: '+d3iso);  var d4 = new date(2016, 07, 01); var d4month = d4.getmonth()+1; var d4iso = d4.toisostring().slice(0,10).replace(/-/g,"");  console.log(d4); console.log('4month: '+d4month+' iso: '+d4iso);

output (console):

wed aug 24 2016 11:30:51 gmt+1000 (aus eastern standard time) 1month: 8 iso: 20160824  *sun jul 31 2016 00:00:00 gmt+1000 (aus eastern standard time) 2month: 7 iso: 20160730  sun jul 31 2016 10:00:00 gmt+1000 (aus eastern standard time) 3month: 7 iso: 20160731  *mon aug 01 2016 00:00:00 gmt+1000 (aus eastern standard time) 4month: 8 iso: 20160731

why 'd2' return 20160730 when object returns 31st july?

why 'd4' return 20160731 when date set 1st august?

why d3 work correctly?

my assumption that iso date somehow subtracts gmt+10 , gets previous day.

i'm aware of step (protoype function) try , format get string in yyyymmdd format js date object? still mystery me why above produces different results...

return [this.getfullyear(), !mm[1] && '0', mm, !dd[1] && '0', dd].join('');

why 'd2' return 20160730 when object returns 31st july?

because when do:

var d2 = new date(2016,06,31);

you create date equivalent 31 july, 2016 @ 00:00:00 in host system's current time zone. when do:

console.log(d2);

your current system settings used generate string in host system's time zone (apparently gmt+10:00) , show equivalent of 2016-07-31t00:00:00+10:00.

but when do:

console.log('2month: '+d2month+' iso: '+d2iso);

the date in time zone gmt, or 10 hours earlier if time before 10:00, date previous day (gmt) , you'll see:

2016-07-30t14:00:00z

but because sliced time part off string, see date part.

it "works" d3 because when do:

var d3 = new date('2016-07-31');

the date string treated utc*, you're creating date 2016-07-31t00:00:00z equivalent 2016-07-31t10:00:00+10:00, i.e. utc date same local date. note output of:

console.log(d3);

is @ 10:00:00 (because built–in tostring considers system time zone, adds 10 hours displayed date), time zone offset.

in of above, actual time value of date object utc. host system time zone offset used creating time value initially, get , set methods year, month, day, hour, etc. (since daylight saving changes time zone) , when generating human readable date strings.

* note contrary iso 8601, specifies dates without time component should treated local. ecma-262 treats them utc. there versions of browsers '2016-07-31' treated invalid, others treated local, while latest treat utc. why strongly recommended manually parse date strings (use own function or library parser) control how it's parsed , how time zone applied.


Comments

Post a Comment

Popular posts from this blog

mysql - Dreamhost PyCharm Django Python 3 Launching a Site -

-
i'm new python/django , created simple django website using pycharm. site works fine running on computer, i'm lost when comes taking site onto host (dreamhost). i'm able upload files correct directories fine, , believe made correct changes database on mysql. i'm not sure go there though. right now, page shows files rather site. direction appreciated. much! you should not run django application using python manage.py runserver on production. how run application on django depends on server (apache, nginx) want use for apache - https://docs.djangoproject.com/en/1.10/howto/deployment/wsgi/modwsgi/ for nginx - https://www.digitalocean.com/community/tutorials/how-to-serve-django-applications-with-uwsgi-and-nginx-on-ubuntu-14-04 the mysql database should, of course, exist , have correct credentials. or, if choose use sqlite, file should accessible, readable , writable www-user (may different depending on linux distributive)
Read more

java - Sending SMS with SMSLib and Web Services -

-
i have made rest web service send smss using hsdpa usb modem. using smslib in java send smss. every time web service invoked, create gateway start service, send message, stop service , remove gateway. takes 20 seconds each message. found starting service takes lot of time. part of code use send smss service.getinstance().addgateway(gateway); service.getinstance().startservice(); outboundmessage msg = new outboundmessage(phonenumber, message); if (service.getinstance().sendmessage(msg)) { result = "message sent successfully!!"; } else { result = "could not send message."; } service.getinstance().stopservice(); service.getinstance().removegateway(gateway);//remove gateway is there way can start service once if not started , use send message when ever web service invoked? why dont group messages , send in 1 go? service.getinstance().sendmessages(messa...
Read more

java - How to resolve The method toString() in the type Object is not applicable for the arguments (InputStream) -

-
i'm trying read json file local machine. @path("/") public class jsonparsing { file f = new file("file.json"); if (f.exists()){ inputstream = new fileinputstream("file.json"); string jsontxt = ioutils.tostring(is); system.out.println(jsontxt); jsonobject json = new jsonobject(jsontxt); string = json.getstring("1000"); system.out.println(a); } } but i'm getting error in tostring() method. possible read .txt file containing json object local machine? if possible, how done? firstly: whenever ask question- add imports well. secondly: yes possible read .txt file containing json object. steps: 1. add maven dependency in pom.xml - <dependency> <groupid>com.googlecode.json-simple</groupid> <artifactid>json-simple</artifactid> <version>1.1.1</version> </dependency> or add jar of dependency. 2.import...
Read more