Below are three options for using T-SQL to return the first day of the month in SQL Server.
This could be the first day of the current month, or the first day of a month based on a given date.
dates
Subtract Minutes from a Time Value in PostgreSQL
In PostgreSQL, we can use the - operator to subtract one or more minutes from a time value.
By “time” value, this could be an actual time value, a timestamp, or an interval. We can also subtract minutes from a date value or a date and time combination.
Add Months to a Date in SQLite
In SQLite, we can use the DATE() function to add one or more months to a date.
When we’re dealing with datetime values, we can use the DATETIME() function.
How to Get the Last Day of the Month in Oracle
In Oracle Database we can use the LAST_DAY() function to return the last day of a given month. This can be the last day of the current month or the last day of month based on a specified date.
How to Get the Last Day of the Month in MySQL
We can use MySQL’s LAST_DAY() function to return the last day of a given month.
This could be the last day of the current month, or the last day of the month based on a date that we specify.
Get the Number of Days in a Month in PostgreSQL
Here’s an example of using PostgreSQL to return the number of days in a month, based on a given date.
Get the First Day of the Month in PostgreSQL
We can use the following method in PostgreSQL to return the first day of a given month.
This could be the first day of the current month, or the first day of the month based on a date that we specify.
Getting the first day of the month allows us to perform further calculations on the resulting date, like adding a certain number of days to the start of the month, etc.
Add Hours to a Time Value in PostgreSQL
In PostgreSQL, we can use the + operator to add one or more hours to a time value.
By “time” value, this could be an actual time value, a timestamp, or an interval. We can also add hours to a date value or a date and time combination.
Calculate the Number of Seconds Since a Particular Date/Time in SQLite
If you need to calculate the number of seconds that have passed since a given date and time, you can use the UNIXEPOCH() function.
Note that this function was introduced in SQLite 3.38.0, so it will only work if you’re using SQLite 3.38.0 or later.
Add Days to a Date in SQLite
In SQLite, we can use the DATE() function to add a given number of days to a date.
If we’re dealing with datetime values, we can use the DATETIME() function.