Not sure why I can't find what I'm looking for. But I just want to store the current time into a Firestore document like this:
. In Flutter we just do this:
'timestamp': DateTime.now()
I tried doing this in kotlin:
"timestamp" to LocalDateTime.now()
But it gives me some complicated field:
The best way on all platforms is to use the server timestamp token provided by the SDK (and not using the client's clock, which could be wrong).
The documentation is here.
// Update the timestamp field with the value from the server
val updates = hashMapOf<String, Any>(
"timestamp" to FieldValue.serverTimestamp()
)
docRef.update(updates).addOnCompleteListener { }
If you really do want the client clock's time, just pass a java Date with Date() or Timestamp with Timestamp.now().
Related
I am trying to Create Date Format the US to Indian Date Format like(dd/mm/yyyy hh:mm tt).
When I run the code on my local machine it works.
When we publish and fetch values from the server at that time it shows "US" Date Format(mm/dd/yyyy)
How τo do the internal conversion, in Appsettings.json what strings i need to mention.
public static DateTime ConvertIndianDateFormat(DateTime usTime)
{
DateTime dateTime = DateTime.Now;
TimeZoneInfo usEasternZone = TimeZoneInfo.FindSystemTimeZoneById("US Eastern Standard Time");
TimeZoneInfo indianZone = TimeZoneInfo.FindSystemTimeZoneById("India Standard Time");
DateTime usEasternTime = TimeZoneInfo.ConvertTimeFromUtc(usTime, usEasternZone);
DateTime indianTime = TimeZoneInfo.ConvertTimeFromUtc(usTime, indianZone);
return indianTime;
}
This is because you are probably using something like DateTime.Now for C# and if you have an SQL Server you are using GETDATE(). It's not like an issue with application.json or something. The above functions return the machine datetime, thus why locally on your pc the time is correct and incorrect if you upload it to a server.
So make sure that the time is correct. If you are uploading to servers in another country then you will probably have a different time and/or format.
How you proceed depends on your needs:
Is the time correct?
Then simply reformated it or store it specifically using
DateTime.Now.ToString("dd/mm/yyyy hh:mm tt") // this is not the correct format.
Do you want to serve multiple clients in multiple regions/countries?
Then you should store the time as UTC and cast it based on clients date format. For example the server could be in USA and someone from UK would view a different time than his own which would be weird.
DateTime.UtcNow
Generally your problem could be large or small depending on your needs
I'm trying to pacha a string format dated "2019-05-14 13:30:00" to a UNIX format.
In javascript I got it but in the javascript kettle module I am not able to return the numeric value 1557833442
the line of code is this:
const tests = (new Date ("2019-05-14 13:30:00"). getTime () / 1000);
It looks like the Date() constructor doesn't like the format you are using.
If you want the current date, use a Get System Info, it has a number of useful date options.
If you are converting an incoming field, use the Select Values step to change the metadata, using the format string that matches your string field's format.
I have a database with measured values from devices that I want to display in a web frontend. First I send the list of devices to the frontend together with the IANA timezone specifier for each device.
I would like all timestamps to be exchanged as UTC. The user selects a time range in the frontend in device-local time. I use moment.js to convert these timestamps to UTC with the known timezone of the device like this:
var startTimestamp = new Date(2017, 7, 1); //some local timestamp (zero-based month!)
var m = moment.tz(startTimestamp, "Europe/Berlin");
var utc = moment.utc(m).format();
utc is now "2017-07-31T22:00:00Z" which seems to be correct given the 2 hours offset for Berlin in DST.
I send this utc timestamp to my ASP.NET Core backend. The controller looks like this:
[HttpGet]
public IEnumerable<TimestampedValue> GetValues(int id, DateTime startTimestamp)
{
...
}
The problem is that startTimestamp is 2017-08-01 00:00:00 when the controller is called and its Kind property is set to Local. I would have expected it to be the same UTC timestamp.
Any idea what I'm doing wrong? I think moment.js is doing its job correctly so this must be a problem on the server side. If I recall correctly, the deserialization is done by JSON.net but I don't understand why it does not respect the Z at the end of the time string.
After #dbc pointed me to the different behavior between GET and POST requests I come to this conclusion:
Since my request uses the GET method and query strings are not JSON, there is no JSON.net involved in the problem, it is the default .NET Core DateTimeConverter that does the conversion. Moment.js correctly converts the timestamp to a UTC string, I checked that using the browser developer tools.
The code for DateTimeConverter can be found here:
https://github.com/dotnet/corefx/blob/312736914d4e98c2948778bacac029aa831dd6b5/src/System.ComponentModel.TypeConverter/src/System/ComponentModel/DateTimeConverter.cs
As can be seen there, the converter uses DateTime.Parse. It can be tested in a simple test project that DateTime.Parse does not respect the Z-suffix. This is also discussed here DateTimeConverter converting from UTC string.
I think there would be at least four solutions
1) write a custom model binder. These SOs each show a part of it Custom DateTime model binder in ASP.NET Core 1 (RTM)
https://dotnetcoretutorials.com/2016/12/28/custom-model-binders-asp-net-core/
2) write a custom type converter that overrides the default DateTime converter and checks whether there is a trailing Z. If so, use DateTime.Parse with the DateTimeStyles.AdjustToUniversal. Else fall back to the default implementation. I like this solution but I currently don't know how to replace the default DateTimeConverter.
3) replace all relevant DateTime parameters in the controllers with DateTimeOffset. DateTimeOffset seems to correctly convert the UTC string.
4) use a POST instead of a GET request with JSON in the request body. JSON.net seems to correctly convert the UTC string.
My preferred solution is currently a mixture of 3 and 4, depending on the context.
I have a custom module in openerp 7 with fields check-in time(date-time) and check-out time(date-time). When I click on save, i want to perform a validation on both fields to ensure check-out time is not less than check-in time. Thanks for any ideas.
As above, use datetime.
In Odoo your dates, times and datetimes are handed to use as strings formatted using
openerp.tools.DEFAULT_SERVER_DATE_FORMAT, DEFAULT_SERVER_TIME_FORMAT and DEFAULT_SERVER_DATETIME_FORMAT.
from datetime import datetime
from openerp.tools import DEFAULT_SERVER_DATETIME_FORMAT
check_in = datetime.strptime(my_object.check_in, DEFAULT_SERVER_DATETIME_FORMAT)
check_out = datetime.strptime(my_object.check_out, DEFAULT_SERVER_DATETIME_FORMAT)
Go nuts with comparisons etc.
A couple of notes:
I highly recommend reading up on the datetime module in the standard library, particularly strftime, strptime and timedelta
Remember you will be getting the dates and datetimes in UTC. The classes that represent the date and datetime fields have methods to return dates and timestamps in the users' timezone but you will not usually need these. Have a look at fields.date.context_today and fields.datetime.context_timestamp
I would try to use the datetime class from the datetime module.
Import relevant python module
from datetime import datetime
Retrieve your record via the appropriate method i.e.
your_record = self.pool.get('your_custom_module').search(cr, uid, domain, offset=0, limit=None, order=None, context=None, count=False)
note: you need to provide proper domain and modify/remove arguments to suit you needs
Create datetime objects from relevant fields (use the strptime method of datetime class : create a date object from a string). Something like :
check_in = datetime.strptime(your_record[0]['check-in time'], '%Y-%m-%d')
check_out = datetime.strptime(your_record[0]['check-out time'], '%Y-%m-%d')
note: you need to adapt the format('%Y-%m-%d') to whatever format your DB returns
Compare both object with a simple expression :
if check_in < check_out:
...
else:
...
Do whatever other operations need to be done.
It's kinda hard to provide more info without additional details about your flow.
Hope this helps,
Cheers
How do I retrieve the locale-specific date format string in Flex / ActionScript 3? I am unable to find a method to return the actual format string (that which specifies the date format) based on the current locale. I am asking this question because I was hoping to find a way to convert a String to a Date based on the current SHORT date format for the locale. Java allows one to call:
DateFormat format = DateFormat.getDateInstance(DateFormat.SHORT, locale)
to retrieve an instance of DateFormat that formats according to the SHORT format based on the locale.
Does similar functionality exist in Adobe Flex (ActionScript 3) 3? If not, is there a reliable third party library that exists for this?
I'm just found this package that do the job. Here describe the class DateTimeFormatter:
var formatter:DateTimeFormatter = new DateTimeFormatter(LocaleID.DEFAULT, DateTimeStyle.LONG, DateTimeStyle.SHORT);
var result:String = formatter.format(date);
Just cool.
Extending Gojan's answer:
private function cc(event:FlexEvent):void {
var formatter:DateTimeFormatter = new DateTimeFormatter(LocaleID.DEFAULT, DateTimeStyle.SHORT, DateTimeStyle.NONE);
//now if publishDate is a mx:DateField, the formatString of spark and mx components are slightly different.
//So, we replace all d with D and y with Y
publishDate.formatString=replaceAll(formatter.getDateTimePattern(), ["d", "y"], ["D", "Y"]);
}
private function replaceAll(text:String, searchArray:Array, replArray:Array):String {
for (var i:int=0; i<searchArray.length; i++) {
var s:String=searchArray[i];
var d:String=replArray[i];
text=text.split(s).join(d);
}
return text;
}
Yeah I have to say Java is better with dates - you set the locale and automatically your dates are outputted correctly! I can't seem to find such a facility in Flex.
In order to output your dates correctly for each locale I think you have to do what is written in this article: http://livedocs.adobe.com/flex/3/html/help.html?content=l10n_1.html. Maybe you should do this, and in the same class just make these strings which you've pulled from the locale file available to the rest of your app, then you'll be able to operate on them.
Otherwise perhaps this guy's library will help you? I'm not sure.
http://flexoop.com/2008/12/flex-date-utils-date-and-time-format-part-ii/