# Frequent question: How do I calculate weeks in SQL query?

Contents

## How do I calculate weeks in SQL?

Full query for week start date & week end date

1. SELECT DATEADD(DAY, 2 – DATEPART(WEEKDAY, GETDATE()), CAST(GETDATE() AS DATE)) [Week_Start_Date],
2. DATEADD(DAY, 8 – DATEPART(WEEKDAY, GETDATE()), CAST(GETDATE() AS DATE)) [Week_End_Date]

## How do I calculate weeks in a month in SQL?

Just wrap the output of that function with a DATEPART(wk, last_day_of_month) call. Combining it with an equivalent call for the 1st-day-of-week will let you get the number of weeks in that month.

## How do you calculate weeks?

How to calculate the number of weeks between two dates. To calculate the number of weeks between two dates, start by counting the number of days between the start and end date. Then, divide that number by 7 days per week.

## What is current week number?

The current Week Number is WN 42.

## How dO I get a week start and end in SQL?

Week start date and end date using Sql Query

1. SELECT DATEADD( DAY , 2 – DATEPART(WEEKDAY, GETDATE()), CAST (GETDATE() AS DATE )) [Week_Start_Date]
2. select DATEPART(WEEKDAY, GETDATE()) …
3. Select DATEADD( DAY , 8 – DATEPART(WEEKDAY, GETDATE()), CAST (GETDATE() AS DATE )) [Week_End_Date]
4. select DATEPART(WEEKDAY, GETDATE())
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## How do I get the first day of the month in SQL?

Explanation :

1. Find the first day of the month. Dateadd(dd, -Datepart(dd, Getdate()) + 1, Getdate())
2. Then check the day of the previous date by using Datename function. Datename(dw, Dateadd(dd, -Datepart(dd, Getdate()) + 1, Getdate()))
3. If the Datename is Saturday the add 2 days to the first day of the month .

## How do I get the current week number in SQL?

You can use select DATEPART(WEEK,DAY(getdate())) to get the week of the month. GETDATE() can be replaced by any datetime variable or even a string like ‘2010-12-07’ ; i am using ‘yyyy-dd-mm’ format.

## What is the format for date in SQL?

SQL Date Data Types

DATE – format YYYY-MM-DD. DATETIME – format: YYYY-MM-DD HH:MI:SS. TIMESTAMP – format: YYYY-MM-DD HH:MI:SS.

## Is 4 weeks considered a month?

In order to calculate the number of weeks in a month, we need to count the number of days in the month and divide that number by 7 (1 week = 7 days).

Weeks in a Month Table.

Month Days Weeks
February 28 days (regular year) 29 days (leap year) 4 weeks 4 weeks + 1 day
March 31 days 4 weeks + 3 days

## How many hours are in a month?

365.25 days X 24 hours / 12 months = 730.5 hours.

## Which week of the year is it?

There are 52 weeks in 2021. The current week (week 42) is highlighted.

Week Numbers for 2021.

Week number From Date To Date
Week 50 Dec. 13, 2021 Dec. 19, 2021
Week 51 Dec. 20, 2021 Dec. 26, 2021
Week 52 Dec. 27, 2021 Jan. 2, 2022
Week 01, 2022 Jan. 3, 2022 Jan.

## How many weeks do we have in 2021?

The year 2021 has 52 calendar weeks. 2021 begins on 01/01/2021 and ends on 31/12/2021. The first calendar week in 2021 begins on Monday, the 04/01/2021 and ends on Sunday, the 10/01/2021. The last calendar week in 2021 begins on Monday, the 27.12.