var data = d3.nest()
.key(function(d) { return d.date;})
.rollup(function(d) {
return d3.sum(d, function(g) {return g.something; });
}).entries(csv_data);
using this code above I can group by date which is in the format yyyy-mm-dd , but I want to group using the month as key. How do I do this ?
You can use the builtin method d3.timeMonth() to get the first day of the month for a date like:
d3.nest()
.key(function(d){ return d3.timeMonth(d.date); });
If d.date is not already a javascript Date object you have to first parse it to be one.
var date_format = d3.timeFormat("%Y-%m-%d");
csv_data.forEach(function(d, i) {
d.date = date_format.parse(d.date);
};
You need to change the key function to return the value you want to nest by. In most cases, the key function just returns a property of the data object (like d.date), but in your case the function will require a little more calculation.
If your date is stored as a string of the format "yyyy-mm-dd" you have two options for extracting the month: either
use regular expressions to extract the portion of the string in between the "-" characters, or
convert it to a date object and use date methods to extract a component of the date.
Browsers differ in which date formats they can convert using the native Javascript new Date(string) constructor, so if you're using date objects you may want to use a d3 date format function's format.parse(string) method to be sure of consistent results.
Related
I am trying to use Yup with Formik for my user profile screen. The validation works fine but it expects the format of the date entered by the user to be in USA format MM/DD/YYYY rather than the application required European/UK standard format DD/MM/YYYY. Entering 31/12/1995 fails validation.
dateOfBirth: Yup.date()
.required("Date of Birth is required")
.max(dateToday, "Future date not allowed")
I have searched through the Yup docs and SO but I can't work out how to do this. Any ideas?
You can use the transform method to parse value.
Like:
startDate: Yup.date()
.transform(value => {
return value ? moment(value).toDate() : value;
})
.required("Date of Birth is required")
.max(dateToday, "Future date not allowed");
I had this same issue myself and resolved it using the example in the Yup README replacing MomentJS with date-fns which is what I use for date manipulation.
Value returns Invalid Date before you custom transform is applied so you must use the original value and context to check to see if you need to run the transform logic at all and if so run it on the value from the field and not the transformed value.
Yup transform docs and date example
import { parse } from 'date-fns';
[...]
date()
.transform((value, originalValue, context) => {
// check to see if the previous transform already parsed the date
if (context.isType(value)) return value;
// Date parsing failed in previous transform
// Parse the date as a euro formatted date string or returns Invalid Date
return parse(originalValue, 'dd/MM/yyyy', new Date());
})
This works perfectly for me and works for both US and UK date formats (you will still need to perform manipulation on the date if its in the us format as it will submit this value as valid)
If you ONLY want UK/Euro dates then just remove the context type check
.transform((value, originalValue) => parse(originalValue, 'dd/MM/yyyy', new Date()))
Problem: Change the Date input field from "mm/dd/yyyy" to "dd/mm/yyyy".
I already know how to change after i receive the date, but the problem is that when the client is typing the input is still receiving "mm/dd/yyyy".
My mongoose schema:
const schemaRegister = new mongoose.Schema({
date: Date,
});
My input area:
<b-form-input v-mask="'##/##/####'" v-model="date"></b-form-input>
My date formating (using momentsjs):
changeDateFormat() {
let fixedDate = moment(this.registers[i].date).format("L");
this.registers[i].date = fixedDate;
}
I am displaying the 'fixedDate' on the table, but it doesn't help a lot because when the client is typing he thinks the first 2 slots are the days (dd), but in reality they are the month (mm). As a solution i thought of using the Date as a String but then it would make the verification very difficult.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date
just pass the parameters in the correct order, like this:
new Date(day, monthIndex, year);
I wasn't using the 'momentsjs' correctly, first i needed to parse the input date by using
let formatedDate = moment(this.date,"DD-MM-YYYY");
and then for displaying the date i should have used
let fixedDate = moment(this.registers.date).format("DD/MM/YYYY");
I have a date field that is javascript number date and I want to get the string or object of date (like new Date(date)) in find query projection instead of date field itself that is number.
//I want to get
datetime:new Date(date)
//instead of
db.myCollection.find({},{date:1})
thanks.
You can use forEach or map function
db.yourCollectionName.find({}).map(function(doc) {
return {
d:new Date(doc.datetime)
};
});
How to show current date before clicking the date field in odoo?
Odoo Date field class provides methods to get default values for like today.
For dates the method is called context_today() and for datetimes context_timestamp(). You are able to pass a timestamp to this methods to either get today/now (without timestamp) or a timestamp which will be formed by the logged in users timezone.
Code Example:
from odoo import fields, models
class MyModel(models.Model):
_name = 'my.model'
def _default_my_date(self):
return fields.Date.context_today(self)
my_date = fields.Date(string='My Date', default=_default_my_date)
Or the lambda version:
my_date = fields.Date(
string='My Date', default=lambda s: fields.Date.context_today(s))
I found it.It is Simple, just write this on your python code like:
date = fields.Datetime(string="Date", default=lambda *a: datetime.now(),required=True)
or
like this
date = fields.Datetime(string="Date current action", default=lambda *a: datetime.now())
or
like this
date = fields.Date(default=fields.Date.today)
I am want to display a date in MM/yyyy format. I am using the below code to change the format :
var inputDate = new Date(data);
var date = dojo.date.locale.format(inputDate, {datePattern: "MM/yyyy", selector: "date"});
data contains the input date. For example when German Locale is set in the browser, the input value is like : 01.03.2016 05:30
while creating the date object with this value gives invalid Date though it works when the US locale is set in the browser.Please guide to fix this.
You can use locale.parse to convert your localized date string into a date object, then convert the date object into the formatted date you want.
See this small example:
var browserLocale = 'de',
data = '01.03.2016 05:30';
require(["dojo/i18n", "dojo/date/locale"], function(i18n, locale){
require([i18n.getL10nName("dojo/cldr", "gregorian", browserLocale)], function() {
var dateObject = locale.parse(data, {formatLength: 'short', locale: 'de'});
alert(locale.format(dateObject, {datePattern: "MM/yyyy", selector: "date"}));
});
});
<script src="//ajax.googleapis.com/ajax/libs/dojo/1.10.4/dojo/dojo.js"></script>