When I Insert timestamp into Postgres table in EST (2019-02-21 05:37:46) and in Postgresql table is stores in IST (2019-02-21 16:07:46). I want time to be stored only in EST. Can anyone help me to fix this issue?
In postgres, you can change the default format mask for datetimes using the set n postgres, you can change the default format mask for datetimes using the set datestyle
for more details follow this link
also refer this link
To my knowledge, there is no setting in PostgreSQL that would trim seconds from timestamp literals by default
In general you should handle all datetimes in UTC, because these are absolute timestamps that are always correct. Even if you are only going to have users in the EST time zone use your website, the EST time zone has daylight saving time (DST) in the summer, so you could get buggy behaviour when the time jumps (especially since there is an overlap of one hour when the clock goes back). This means:
Your code should use UTC timestamps to make calculations and pass around
Your database should store UTC datetime (which PostgreSQL does anyway).
You should only transform to a local time zone when presenting the data to the user. This is default behaviour in Django:
USE_TZ = True by default
TIME_ZONE = "America/New_York" to set default time zone, which will take into account DST
So when you're saving a time-aware datetime to the database (in EST say), the database stores it as UTC. When you fetch and display it, Django will show it in the current time zone of the user (EST in your case). When you query the database directly using a tool, PostgreSQL gives back the UTC, correct datetime, but your shell or tool might display it in the local time zone. You can format your query to use a different time zone using the links posted by #c.grey in the other answer.
Read up on the details here
Related
I have time zone support as active in my application settings USE_TZ = True
So, all my DateTimeFields in my models are transformed from my local time zone to UTC before being saved to database.
Question:
In some cases, the user enters a datetime field value with day precision only like 2022-10-24 without time part, and I already accepts this format as an input. But in such case, I want to save this value without time zone, so that it will be parsed later without time zone.
Why does this cause a problem?
If a user enters a value 2022-10-24 and his local time zone is UTC+2, it will be saved in database as 2022-10-23 22:00:00 UTC. Once another user opens the same instance and his local time zone is UTC+1, he will see the value as 2022-10-23 23:00:00 while I want him to see it with the same value that the initial user enters it, so it should be 2022-10-24 00:00:00.
Partially Failed Trial:
I have tried to handle this in my ModelForm by parsing the entered format, then replacing the time zone info to UTC if it is with day precision.
from pytz import UTC
datetime_value = datetime_value.astimezone().replace(tzinfo=UTC)
Now, the value is saved in database as 2022-10-24 00:00:00 UTC. But when I reads the value of this field, it will be parsed as 2022-10-24 02:00:00 as my local time zone is UTC+2, however I want it to be read as UTC.
How can I override the reading behavior of the datetime field to be shown as UTC?
I'm building few dashboards in Apache superset. All my available timestamp fields are in UTC timezone. (for example fields are, class_start_time & class_end_time).
I want that in the timezone the dashboard is opened all the timestamp fields will be automatically converted.
For example, I'm opening dashboard in Norway , so the UTC data should be converted to CET timezone of Norway.
I have tried to add some value here in Hours offset but its not working.
Can you please guide how we can achieve this.?
Just for reference :
In Kibana dashboards (ELK stack) have feature to automatically convert the timezone into which it is being opened. So I need same thing in Superset.
Normally you would be able to set this with environment variables when you start the program or container. In Apache Superset, this is not possible. There is an ongoing discussion on Github about this issue. One GitHub user posts the problem and workaround, which is far from workable:
Daylight savings causes issues where users have to update datasource
timezone offset for each datasource twice per year.
So the only thing you can do is update the hours offset twice a year. To make matters even worse, if you use Postgresql, this may not even be possible due to a bug as described here.
What the title says. For simplicity and standardization, I want to store datetimes in UTC timezone, but I want to display them in Admin's local timezone. No matter the settings (TIME_ZONE and USE_TZ), I still have Note: You are x hours ahead of server time when editing my datetimes. I want this note to go away, and the flow to be like:
Type time in local time and click save
Datetime created will be saved in UTC timezone
When I get it from DB by request, it will still be in UTC. Conversion is handled by front end.
If I look at it from admin, it will be in local timezone.
If I have a DateTimeField() in a model in my app, can I sometimes store a date time with one timezone and sometimes a different timezone?
Short answer: Yes, you can.
When Django saves the timezone, it saves it as the UTC time in the database. When it goes to display it again in your app, it will look for the settings.TIME_ZONE and apply that time zone. If you need to convert it back to a particular time zone, you will also need to store the string of which time zone it is.
More about: Django Time Zones.
I am writing a site to be served internationally across multiple timezones.
In the settings.py:
TIME_ZONE = 'UTC'
USE_TZ = True
I am wondering if someone from NZ puts in a datetime via models.DateTimeField, does it automatically picks up the current timezone and convert to UTC without any extra code?
I am a bit confused on this paragraph:
The current time zone is the equivalent of the current locale for
translations. However, there’s no equivalent of the Accept-Language
HTTP header that Django could use to determine the user’s time zone
automatically. Instead, Django provides time zone selection functions.
Use them to build the time zone selection logic that makes sense for
you.
So do I have to override the save method to add the get_current_timezone()?
The key sentence there is: "However, there’s no equivalent of the Accept-Language HTTP header that Django could use to determine the user’s time zone automatically."
So there's no way for Django to reliably figure out your NZ user's time zone. It's not going to give you the user's time zone - you have to tell it! Specifically, until you explicitly activate() a time zone, the current time zone is just UTC as you defined in your TIME_ZONE setting.
When it comes to user input, the documentation says: "Django interprets datetimes entered in forms in the current time zone and returns aware datetime objects." So, if you've activated the appropriate NZ time zone then the conversion will happen as you expect. But if not, the datetime will be interpreted as being in your default UTC timezone.
How do you figure out the user's timezone? The documentation gives an example of how you can set it based on a value explicitly chosen by the user. I'm sure there are also services out there that try to guess the time zone based on the IP address. Either way, though, Django won't do it for you.