I post date in the format from angular as MM/DD/YYYY but but when it saves in Mongodb it saves the ISO() format with one day less. I am developing using MEAN stack.
eg :(from angular ) 10/03/2016
mongodb : ISODate("2016-10-02T18:30:00.000Z")
I would like to resolve the timezone issue while saving the date in mongodb .
The MongoDB saves date time in UTC. So, it changes from IST to UTC before saving. IST offset is +05:30 from UTC. So your date time 10/03/2016 00:00:00 goes back 2016-10-02T18:30:00.000Z, the same date time in UTC.
You have to set the time back to IST while fetching the data from MongoDb before presenting to the client.
Btw you should try and save the datetime in ISO format from the beginning.
More here on the MongoDB doc page for Date
Related
We have our time saved without a timezone offset inside our SQL Server database. The time is actually Central Europe Standard Time but due to no timezone offset in the time string it is treated as UTC. This now creates a bunch of problems regarding daylight saving times.
My question would be: is there a way to retroactively convert the Time with offset to the correct CEST Time.
For example my time string in my database is '2022-10-30 02:00' and should be converted to '2022-10-30 00:00+2' as well as '2022-10-30 03:00' to '2022-10-30 01:00+1'.
There is an option to convert a datetime object to another timezone with "AT TIME ZONE" but this didn't help much due to the date objects being treated as UTC in the database, but we need to convert them to the UTC+[offset] format. Also due to the daylight saving time changing timezone offsets during the year, we can't subtract the timezone offsets with a set value.
I’m trying to work with date-fns-tz in my react-based webpage and couldn’t make the following use-case to work.
I have a date input in a form that should be submitted to the backend that stores the data in local timezone.
A user in GMT+2 timezone selects 14:00 on 1/Feb/2021 in the UI, which correlates to 1612180800 timestamp (as the UI was opened in GMT+2), but it should eventually get sent to the backend as 14:00 in GMT-8, which is actually 1612216800 timestamp.
What’s the right way to get this conversion (from 1612180800 --> 1612216800 ) to work?
I tried to work with various date-fns functions, but hadn’t found the right one.
You'll need two things to make this work correctly:
An IANA time zone identifier for the intended target time zone, such as 'America/Los_Angeles', rather than just an offset from UTC.
See "Time Zone != Offset" in the timezone tag wiki.
A library that supports providing input in a specific time zone.
Since you asked about date-fns, you should consider using the date-fns-tz add-on library.
Alternatively you could use Luxon for this.
In the past I might have recommended Moment with Moment-TimeZone, but you should review Moment's project status page before choosing this option.
Sticking with date-fns and date-fns-tz, the use case you gave is the very one described in the docs for the zonedTimeToUtc function, which I'll copy here:
Say a user is asked to input the date/time and time zone of an event. A date/time picker will typically return a Date instance with the chosen date, in the user's local time zone, and a select input might provide the actual IANA time zone name.
In order to work with this info effectively it is necessary to find the equivalent UTC time:
import { zonedTimeToUtc } from 'date-fns-tz'
const date = getDatePickerValue() // e.g. 2014-06-25 10:00:00 (picked in any time zone)
const timeZone = getTimeZoneValue() // e.g. America/Los_Angeles
const utcDate = zonedTimeToUtc(date, timeZone) // In June 10am in Los Angeles is 5pm UTC
postToServer(utcDate.toISOString(), timeZone) // post 2014-06-25T17:00:00.000Z, America/Los_Angeles
In your case, the only change is that at the very end instead of calling utcDate.toISOString() you'll call utcDate.getTime().
Note that you'll still want to divide by 1000 if you intend to pass timestamps in seconds rather than the milliseconds precision offered by the Date object.
You can use 'moment' to convert timezone.
1.Create a moment with your date time, specifying that this is expressed as utc, with moment.utc()
2.convert it to your timezone with moment.tz()
For example
moment.utc(t, 'YYYY-MM-DD HH:mm:ss')
.tz("America/Chicago")
.format('l');
When I try to make a post request with React js to a make a reservation the time diminishes by two hours, while in the state it is exactly the time I wanted, meanwhile in the DB it is saved with two hours less. Example I try to save 11 o'clock instead saves 9 o'clock.
This is how format the date and time before passing it to the api call
const booking_date = new Date(year, month, day, hour, minute);
You can use a timestamp to get a more accurate consistent date
const booking_date = new Date(year, month, day, hour, minute).getTime();
Then if you need an actual date string you can convert it back to a date using new Date(). This is likely a timezone issue so a timestamp would mitigate that, along with giving you the extra bonus of being able to send less data in the api call.
Alternatively, if you NEED a string date you can use:
new Date().toUTCString()
which will convert the date to a UTC string that is consistent across the world (it will give you the same value no matter your location) since it uses the standardised UTC timezone.
See more here:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date
You can use moment.js. If you have a date string then convert it using moment.js before sending the post request or if you do not have any date string, you just need to pick the current date and time means then you can use as like below with the desired format you need. I'd recommend to always use UTC internally, and convert to a timezone only when displaying the date to the user
import moment from "moment";
let date = moment().format('MM-DD-YYYY hh:mm:ss')} // It will return 06-16-2020 08:54:00
Is there some way to find out what is the time zone of a user, in UTC format(like UTC+1, UTC+2,...etc)
What I am trying to accomplish is that after user selects UTC time zone from drop down and selects time and date, I want to show date and time values in his time zone (time zone from browser or system).
So if for example user selects: UTC+2 and 13:00 11-03-2016 and his system time zone is UTC than I want to show in some label: In your time that is: 11:00 11-03-2016 (since the UTC is minus 2 hours comparing to UTC+2)
Does somebody has suggestions on how to accomplish something like this?
Just create new Date object without specifying the time zone - JavaScript will use the browser's time zone and when getting a date, without specifying the time zone, the result is converted to the browser's time zone.
Please review examples on http://www.w3schools.com/js/js_dates.asp
Hope it will help. Handling dates in js and angular is a bit tricky;)
I'm working on a project that was used only in one country but now is in using in several countries.
So I'm working in some DateTime issues, as you can image.
I'm using angular js for my frontend, python for my backend and Postgres as my database in this project.
To avoid any problem with DateTime and try to make more easy to work with the timezones I'm saving the DateTime in the database as UTC.
from DateTime import DateTime
# inside a class of my entity
self.start_date = datetime.utcnow()
This is working fine, the problem is when I try to convert the date back.
For example.
If my application is running in a country with GMT -1, when the user
asks to save the entity and it's 2016-07-13 15:00:00, in the database
(using the UTC now()) the DateTime will become 2016-07-13 16:00:00.
But when I try to get back the value I have two scenarios:
If I don't do anything, I'll receive the DateTime like it's on the database, "2016-07-13 14:00:00"
If I try to convert to the local timezone, I'm getting like 2016-07-13 17:00:00. The time was increased by 1 and not decrease was I expected.
I'm trying to use the momentjs library to work with dates, but nothing seems to work.
I'm wondering if what I supposed to do is get the GMT, like (-01:00) then do some math with the DateTime that comes from the database, like sub or sum the GMT hours difference.
Solution:
My solution for this was, store everything as UTC in my database.
Retrieve the datetime as UTC and covert to browsers timezone using momentjs library.
Doing like this.
moment.tz(moment.utc(datetime), moment.tz.guess());