Is There a Function to Determine Which Quarter of the Year a Date Is In

Is there a function to determine which quarter of the year a date is in?

Given an instance x of datetime.date, (x.month-1)//3 will give you the quarter (0 for first quarter, 1 for second quarter, etc -- add 1 if you need to count from 1 instead;-).


Originally two answers, multiply upvoted and even originally accepted (both currently deleted), were buggy -- not doing the -1 before the division, and dividing by 4 instead of 3. Since .month goes 1 to 12, it's easy to check for yourself what formula is right:

for m in range(1, 13):
print m//4 + 1,
print

gives 1 1 1 2 2 2 2 3 3 3 3 4 -- two four-month quarters and a single-month one (eep).

for m in range(1, 13):
print (m-1)//3 + 1,
print

gives 1 1 1 2 2 2 3 3 3 4 4 4 -- now doesn't this look vastly preferable to you?-)

This proves that the question is well warranted, I think;-).

I don't think the datetime module should necessarily have every possible useful calendric function, but I do know I maintain a (well-tested;-) datetools module for the use of my (and others') projects at work, which has many little functions to perform all of these calendric computations -- some are complex, some simple, but there's no reason to do the work over and over (even simple work) or risk bugs in such computations;-).

Calculate quarter for dates given an example end date and quarter number

Assuming that you have two input variables:

declare @quarter_end date = '2021-01-31';
declare @current_quarter int = 4;

You can calculate the first month of financial year:

declare @first_month_of_fy int = (month(@quarter_end) - @current_quarter * 3 + 12) % 12 + 1;
-- 2 i.e. February

And use that value to calculate the quarter and year for any date using some math:

select *
from (values
('2020-12-15'),
('2021-01-15'),
('2021-12-15'),
('2022-01-15')
) as t(testdate)
cross apply (select
(month(testdate) - @first_month_of_fy + 12) % 12 + 1
) as ca1(month_of_fy)
cross apply (select
(month_of_fy - 1) / 3 + 1,
year(dateadd(month, 12 - month_of_fy, dateadd(day, - day(testdate) + 1, testdate)))
) as ca2(fy_quarter, fy_year)

DB<>Fiddle

Get current quarter in year with javascript

Given that you haven't provided any criteria for how to determine what quarter "*we are currently in", an algorithm can be suggested that you must then adapt to whatever criteria you need. e.g.

// For the US Government fiscal year
// Oct-Dec = 1
// Jan-Mar = 2
// Apr-Jun = 3
// Jul-Sep = 4
function getQuarter(d) {
d = d || new Date();
var m = Math.floor(d.getMonth()/3) + 2;
return m > 4? m - 4 : m;
}

As a runnable snippet and including the year:

function getQuarter(d) {  d = d || new Date();  var m = Math.floor(d.getMonth() / 3) + 2;  m -= m > 4 ? 4 : 0;  var y = d.getFullYear() + (m == 1? 1 : 0);  return [y,m];}
console.log(`The current US fiscal quarter is ${getQuarter().join('Q')}`);console.log(`1 July 2018 is ${getQuarter(new Date(2018,6,1)).join('Q')}`);

Determining the quarter that a date falls in when quarters are based on a random start date

Something more general like this?

var quarter = (((checkDate.Year * 12 + checkDate.Month - 1) - (startDate.Year * 12 + startDate.Month - 1)) / 3) % 4 + 1;

Here is an approach that would take the current day of month into account:

using System;

namespace ConsoleApplication1
{
class Contract
{
public DateTime StartDate { get; set; }

public int CurrentQuarter
{
get
{
var now = DateTime.Now.Date;
var month = (now.Year*12 + now.Month - 1) - (StartDate.Year*12 + StartDate.Month - 1);
if (now.Day < StartDate.Day) month--;
var quarter = (month / 3) + 1;
return quarter;
}
}
// ...
}

class Program
{
static void Main()
{
var contract = new Contract { StartDate = new DateTime(2016, 1, 12) };
Console.WriteLine("Current contract quarter is {0}", contract.CurrentQuarter);
}
}
}

Make a list with the quarter and year based on a date range of quarters KDB+/Q

I'm sure there are many ways to solve this, a function like f defined below would do the trick:

q)f:{`$string[1+mod[`month$d;12]%3],'"Q",/:string[`year$d:x[;0]][;2 3]}
q)lyq
2020.01.01 2020.03.31
2020.04.01 2020.06.30
2020.07.01 2020.09.30
2020.10.01 2020.12.31
2021.01.01 2021.03.31
2021.04.01 2021.06.30
2021.07.01 2021.09.30
2021.10.01 2021.12.31
q)f lyq
`1Q20`2Q20`3Q20`4Q20`1Q21`2Q21`3Q21`4Q21

Showing what quarter of a financial year a date is in

This should work:-

SELECT
MyDate,
CASE
WHEN MONTH(MyDate) BETWEEN 1 AND 3 THEN convert(char(4), YEAR(MyDate) - 1) + 'Q3'
WHEN MONTH(MyDate) BETWEEN 4 AND 6 THEN convert(char(4), YEAR(MyDate) - 1) + 'Q4'
WHEN MONTH(MyDate) BETWEEN 7 AND 9 THEN convert(char(4), YEAR(MyDate) - 0) + 'Q1'
WHEN MONTH(MyDate) BETWEEN 10 AND 12 THEN convert(char(4), YEAR(MyDate) - 0) + 'Q2'
END AS Quarter
FROM
MyTable

Output:-

MyDate        Quarter
---------- --------
2011-01-01 "2010Q3"
2011-04-01 "2010Q4"
2011-07-01 "2011Q1"
2011-10-01 "2011Q2"

How to convert dates to quarters in Python?

Pandas has a method to help you, it's called pd.PeriodIndex(monthcolumn, freq= 'Q'). You may need to convert your month column to datatype first by using datetime libray.

Pandas also have a method called 'to_date' that you can use to convert a column to a date column.

For example:

df["year"] = pd.to_date(df["year"])

How to get the first date and last date of current quarter in java.util.Date

Here is solution in Java 7 or older (otherwise, I suggest to check other answers):

private static Date getFirstDayOfQuarter(Date date) {
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.set(Calendar.MONTH, cal.get(Calendar.MONTH)/3 * 3);
return cal.getTime();
}

private static Date getLastDayOfQuarter(Date date) {
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.set(Calendar.MONTH, cal.get(Calendar.MONTH)/3 * 3 + 2);
cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
return cal.getTime();
}

Note 1: Months in java.util.Calendar are represented as integers starting from 0 (Jan) through 11 (Dec)

Note 2: division of integers in Java results in floor value (another integer value). So 2/3 = 0, 4/3 = 1 and so forth.
So, cal.get(Calendar.MONTH)/3 * 3 calculates zero-based index of quarter: 0(Q1), 1(Q2), 2(Q3), 3(Q4).

Example: Feb in Calendar is 1. So, 1 / 3 * 3 = 0.

If Feb date is supplied, then start of the quarter is 1st of Jan (because we got 0) and the end of quarter is last day of month 0 + 2 = 2 (Mar)



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