I have one problem. Can you tell me how to check does it day in the current week?
I am working on some service for a weather forecast. I have a current day but must check does it in the current week. Only what I know is that I must use 'isSame' function from Moment JS.
This is my line of code.
if(this.conversation.payload.grain==="week" && moment().startOf('week').isSame(this.conversation.payload.forecastTime))
"forecastTime" is a current day. However, the condition is not good and does not enter the if loop.
Thank you!
This is assuming your forecastedDate is an actual javascript date or a moment object.
The isSame function also takes in a granularity parameter.
Just add the 'week' parameter to the isSame method like so:
if(this.conversation.payload.grain==="week" &&
moment().startOf("week").isSame(this.conversation.payload.forecastTime, "week"))
To get the day of the week is easily done with the momentjs library.
This will give you a day of the week based on the locale:
var dayOfWeek = moment(this.conversation.payload.forecastTime).weekday()
For example, if the locale uses Monday as the first day of the week then 0 = Monday and 6 = Sunday. Please keep in mind that the value you recieve will change based on the current locale.
If you don't want the value to change based on locale but always want to receive a Monday-Sunday value use isoWeekday():
var dayOfWeek = moment(this.conversation.payload.forecastTime).isoWeekday()
This will give you an integer 1-7. 1 = Monday, 7 = Sunday.
So, for example, if the above code returned 4, you would know that it was Thursday.
For more details on the weekday(), isoWeekday, and day() functions, check out the momentjs docs.
Related
I am building a calendar component in React without using any library but Day.js.
I need to detect the first weekday of the month in order to leave a gap as shown in the picture. Otherwise the first day of every month has to be Sunday. How can I detect the first weekday of the given date?
Day.js has built in function to achieve this
dayjs().startOf("month").day()
This method returns current month's first week day as number.
0 = Sunday,
6 = Saturday
I'm currently just practising JavaScript and I'm trying to create a programme that calculates how many days there are until your next birthday.
I have seen on this site that there is a daysBetween function that I can use to tell the time difference between two dates (I just need to turn these dates into the millisecond value since the 1st Jan 1970).
The problem is that, although one of those dates is the current date (which is easy to convert into its millisecond value), the second is derived from answers the user inputs as a string into a prompt command (there are three different boxes that ask for the year, month and date of their birth). Is there a way I can convert these input strings into a date format that I can then use to find the days between today's date and their next birthday?
Thanks and sorry if this is a stupid question!
Remember in JS that months are indexed from 0, so January === 0.
var date = new Date('2017','5','25'); would be today, assume you have something like:
var userDd = '25';
var userMm = '6'; // User doesn't know the months are indexed at 0.
var userYy = '2017';
var date = new Date(userYy, userMm - 1, userYy);
date.getTime(); // returns the milliseconds value.
I am trying to compare a DAY/TIME e.g. Monday 09:00:00 with the current time to see if I am past that point in the week. e.g. If it is now 05:00:00 on Monday it should return true however it is returning false everytime
var dayTime = Moment("Wednesday 17:00:00", "dddd HH:mm:ss");
var now = Moment(Moment.now(), "dddd HH:mm:ss");
console.log(Moment.utc(dayTime).isBefore(now)); //returns false all the time
I found the following similar questions but it didn't seem to fix the issue after formatting the time.
Comparing two times with Moment JS
When I replace the moment.now() with a string such as "Wednesday 17:00:00" it returns the expected result.
Any idea what I need to do to moment.now() in order for this to work correctly?
Moment.now can be used as an extension point, but it's really not a public API. To get the current time in momentjs you just call moment(). Note that all moment calls use lowercase moment.
To see if your date and time is before the current time, you would just call:
moment('01/01/2016', 'MM/DD/YYYY').isBefore(moment())
You would replace the date and format in question with your own.
I see that you have a date format that includes only day of week and time. Moment will parse this, but be aware that the behavior might not be what you expect. When I parse your date, I get Wednesday December 30, 2015. Exactly what day this lands on will vary by locale. In any case, I doubt that it is what you want. If at all possible, I would get year, month, and day.
If you would like to instead set the moment to Wednesday this week, set the day on the moment using .day(). For instance:
moment().day(3).format()
"2016-06-15T20:19:55-05:00"
For anyone who is interested, the code I posted in my question was changing the day/hour but was setting the year to 2015 which meant that it was always in the past.
To fix I separated out the Day and the Hour and set to moment. Then compared that with now. e.g.
moment().set({"Day": "Friday", "Hour": "17"}).isBefore(moment())
I have a function and it represent a date that is 2 weeks off from start date, counted by each passing Thursday, but excludes the Thursday of the week the date was made.
function GetThursdayIn2Weeks(date)
{
var day = date.getDay();
// Add 2 weeks.
var newDate = new Date(date.setTime(date.getTime() + (14 * 86400000)));
// Adjust for Thursday.
var adjust = 4 - day;
if (adjust <= 0) // Might need to be changed - See comments!
adjust +=7;
// Apply Thursday adjustment.
newDate = new Date(newDate.setTime(newDate.getTime() + (adjust * 86400000)));
return newDate;
}
How would I make this set off a different function every day that passed, starting a week after the beginning of the process, remind me about the due date coming up, but before the end of the date of the process?
You can use setTimeout() to execute a reminder after a set time. However, the problem is that your javascript environment will probably not keep running for such long times, be it node.js or your browser.
I would suggest those mechanisms :
store your target date in localstorage after calculating it with your given code
define a function that will use setTimeout() to define the next occurrence of the reminder for a given target date
when the page is loaded, use that function for each date stored in the localstorage
when a date is added to the localstorage, or a given target date reachs one of its reminders, call the function for this specific date
The mentioned function should set a timer for the first day that is at the same time greater than the current date, greater than the day 1 week before the target date, and lower than the target date.
Here is an 'hopefully) working JSFiddle.
i would like to create a url based on the year and the week number in order to redirect to a document which the name changes every week :
the document is stored at this place : server.com/kw38_2013.pdf (which kw38 mean week 38)
Does someone know a javascript for that ?
Regards
Emmanuel
It will be very easy to get year from a given date object in javascript. See Date Object Reference.
Whereas, Getting the week number from the given date will be tricky. Here is a similar question to get the week number from given date. See Get week of year in JavaScript.
Hope it helps.
See here to get the week number.
You get the year by creating a Date object : new Date().getFullYear()