I want to find the local system timezone using ActionScript 3, I have tried many ways but unable to get any solution which will give me the actual result like if I will select (UTC -8:00)Pacific Time then the result will come UTC -8:00 or (UTC -8:00)Pacific Time (Results in UTC time zone).
So if anyone know how to achieve this please help me to resolve this issue.
Thanks in advance.
You can use the getTimezoneOffset function of the Date object to get an offset from UTC for a particular date. Reference Here.
Note that this offset may vary depending on the date provided. In the US Pacific Time zone, UTC-8 is used in the winter, and UTC-7 is used in the summer when DST is in effect.
Note that that API is for an offset only. There is no API in ActionScript that will give you the machine's local time zone ID, such as America/Los_Angeles (IANA) or Pacific Standard Time (Windows). See "Time Zone != Offset" in the timezone tag wiki.
I am pretty sure if you do
var date:Date = new Date()
then date will be in local browser time
Related
I have a simple system, which on node creation form, allows user to select start and end dates along with hours and minutes:
The problem is that the date gets messed up somewhere in the middle, or I don't know how to convert it.
In the database, two values gets saved as follows:
start: "2019-08-01T14:00:00.000Z"
end: "2019-08-01T16:00:00.000Z"
Seems correct, as in the datepicker I chose 2pm and 4pm. Then, using momentjs and react-big-calendar, I try to put that event into calendar. It seems that it puts +3 hours every time. I assume, it is because it saves it in UTC format, and I live in Eastern Europe, which is +3 hours from UTC.
What is strange, is that I already get back time converted to my own when I make a request to the database:
Thu Aug 01 2019 17:00:00 GMT+0300 (Eastern European Summer Time)
Could someone help me out? I would expect to have the same hours returned and displayed, as I save them, meaning if I select 2pm, it should be 2pm. I think the solution here would be to ignore timezones, and always display everything in UTC? But how to do that? I have access to momentjs if that helps. I tried something like this:
moment.utc(event.start);
But it still returns the same value, which is:
Thu Aug 01 2019 17:00:00 GMT+0300 (Eastern European Summer Time)
When you setup React-Big-Calendar, you define a localizer. By default, the calendar will display in the local timezone of the browser the user is using. Any and all dates given to the calendar will be converted to that local timezone. If your dates, coming from the db, use an offset of +5, but you're sitting in +3, it will automatically convert those times to display +3 (part of the beauty of UTC).
This is where it can get tricky. Say I want to get all values from my db between Sep 19th and Sep 21st. I have to remember those offsets when requesting data from the system. I could use moment and say moment('2019-09-19').startOf('day'), and it would give me 2019-09-19T00:00:00Z, but this isn't exactly correct for me, as I'm at an offset of -5, which means I actually needed 2019-09-18T19:00:00Z to get the start of my day. The same holds true for my end datetime, where I would say moment('2019-09-21').endOf('day') and it would give me 2019-09-21T23:59:59Z, when I would need 2019-09-21T18:59:59Z.
Now, I'm not positive of this (you'll have to do some testing), but if you use moment-timezone instead of moment it may handle all of this for you. You'll have to play around to know for sure.
FINAL EDIT: I worked out timezone handling with moment-timezone as my localizer. I put the entire thing in a GitHub project, as well as creating a CodeSandbox where people can play with it.
TRULY FINAL EDIT: The (0.36.0) latest version of RBC has full timezone support now, when using either the momentLocalizer or the new luxonLocalizer. Doc site isn't up to date yet, but if you run the 'examples' locally you'll find all the info.
I'm working in a scheduler web application and my client (Angular) and server (Asp.net core) timezones are different.
The client is in any timezone. Let´s use (GMT-3).
The server is UTC.
Let´s suppose this case:
One user schedule an event to it´s local time at 08:00AM.
When send this information to serve, it will save 11:00AM in database.
So, when user retrieve this information, client will convert back to 08:00AM due to -3 hours timezone.
But, if this schedule was made to a date in future, when client's country will be in daylight saving, it will convert back to -2 hours. So it will converted to 09:00AM to the client, and that is wrong.
How to deal with daylight saving time when I get dates from server?
Simply, date and times should be stored in UTC. You can always get from UTC back to the user's time. The problem with storing a datetime with an offset is that the offset is not contextual. For example, let's assume that the user is in DST with a timezone that is normally -3 offset from UTC. As such, their current offset is -2. You store the -2 offset, and now what? Is it -2 because they're in a zone that's -2 or is it -2 because it's a -3 zone in DST. There's no way to know. In effect, you've failed to capture critical information.
You don't have this issue with datetimes stored in UTC. You can simply get the user's current time, including their current offset (DST or not) and compare that with the times in your data store. You may need to convert the user time to UTC first, but in many case you do not. For example, the DateTimeOffset type is smart enough to be able to compare taking offset into account. Many databases support this as well for offset-capable column types.
If I understand the issue correctly, you want to keep the server using UTC stored date/times and have the client display local time while handling the DST. I recommend using the angular2-moment, Moment & Momemt-Timezone npm packages. This package will be able to automatically handle the DST when you provide the iana_timezone like America\Chicago.
moment.tz(<utc-date-time>, <iana-timezone>).format()
This will handle all the necessary conversions you need in the client.
See Stackblitz example
Also checkout the Moment Timezone Docs
I Need to get the current Eastern time zone.
I am using asp classic. I tried alot but I did not got the solution.
Any one can help me.
I am using
Now()
to get the current value in vb classic but i need current time in Eastern time zone.
I disagree that converting to UTC time is the way to go, precisely because then you get to deal with the headaches of daylight savings time. Instead, figure out what time zone the server is set to, figure out what the offset is from that to Eastern time, and then instead of just Now, use DateAdd('h',3,Now). (Naturally, replace 3 with the correct number if the server is not on the west coast.)
Alex K has the right answer, which he put in the form of a comment. Here it is in the form of an answer:
Get UTC time -> stackoverflow.com/a/11441116/246342 Add the offset (remembering some places will use daylight savings in the summer)
For my apps I try to store all times as UTC to avoid this problem. For some date/time calcs I can get by with the local time zone of the server, such as when I just need to know elapsed time. So then I'm just careful to make sure the server time zone is what I expect in case I ever need to display it. For example, our marketing dept doesn't think having our special offers expire at "midnight UTC" is very user-friendly, so we just say "midnight Central Time" and let people convert in their heads to their local time. Internally I can compare Now to the expiration date of the offer and it works fine.
We have a really strange problem in xpages regarding dates, the Notesdocument we have contain a date field and the value is only a date, there is no time portion.
In the xpage I have specified to display the date as a date/time value. the date display correctly on the webpage but we are now getting reports from users who login at night (around midnight) and see the date as adjusted by one day. if the same people login at daytime the date is correct so this only seem to happend around midnight
I have tried to change my clock on my client to around midnight but that does not reproduce it so I assume this is a server issue.
The domino server have correct date/time and we are using the latest version of Domino
any ideas?
we encountered the same problem recently and, I believe, found a very nice solution.
system treats the pure date as a date in UTC time zone. Date value is automatically converted into server's time zone. So the question is how to prevent conversion?
this code prevents conversion:
<xp:this.converter>
<xp:convertDateTime
type="date"
ignoreUserTimeZone="true"
dateStyle="long"
timeZone="UTC">
</xp:convertDateTime>
</xp:this.converter>
pay attention at "timeZone" attribute.
The issue is related to not having the TimeZone specified in the date / time field. We ran into this just yesterday. If you don't have the TZ specified, it seems to assume UTC and will adjust accordingly. Include the time zone and your field will stop adjusting erroneously.
Perhaps it has to do with this ?
http://www-304.ibm.com/support/docview.wss?uid=swg21508734
I've seen some reports about XPages Dates and TimeZone Issues
I suspect your Domino version was 8.5.3, because there were 2 APAR, LO72278 and LO67745, on similar problems against 8.5.3. Fixpack 3 addresses them.
The root cause is that Lotus Notes allows you to save a "Date" with no time or zone and the Notes server has a default Time Zone setting to interpret these incomplete things called dates. XPages doesn't play by the same rules, and its master Java wants to know what zone you're using, and looks to the system for some clue, and generally will use midnight within some TZ to refer to a "Date". There is a whole region on Stack Overflow on the "how to store/represent a date" topic - [datetime] - since languages and DBMS each have their own approach.
Nice legacy Notes focused article about it.
http://www-10.lotus.com/ldd/ddwiki.nsf/dx/05022009100728PMAGU5MB.htm
XPages article about it
http://www-10.lotus.com/ldd/ddwiki.nsf/dx/XPagesTimeZones.htm
Too bad they are not totally on the same page, I assume each release gets closer.
i am sending the date and time in ( mm/dd/yyyy hh:mm) this format from india to australia( i am booking a date and time for future), for the user in australia it should show him according to his local time. As australia is 5 hrs and 30 mins past to india. how to do it using flex3.
Flex has no timezone calculation support built-in (you can get your local clock's offset and convert between UTC time and local time and that's basically it), your best bet would be to do the conversion via a server-call (with Joda handling the timezone calculations, which includes DST offsets).
First, use the Date class. Second, use UTC values when sending dates (see getUTC family of methods). So when you receive a date, you'll know it is in UTC so you can set up a Date instance with those UTC values (see setUTC family of methods). The class will automatically do the timezone calculations for you and when you present it to the user it will be in their timezone.