SQLite has a time() function that enables you to return a time value based on a time string and any modifiers.
It returns the time in this format: HH:MM:SS
To use this function, you need to provide a time string, plus any (optional) modifiers. A modifier allows you to change the time, such as add a number of hours, set it to local time, etc
Continue readingSQLite has a date() function that enables you to return a date value based on a time string and any modifiers.
It returns the date in this format: YYYY-MM-DD
To use this function, you need to provide a time string, plus any (optional) modifiers. A modifier allows you to change the date, such as add a number of days, set it to local time, etc
Continue readingThe table below contains the valid format string substitutions that you can use with the strftime() function in SQLite.
Below is a list of valid time string formats that you can use in any date and time function in SQLite.
Continue readingBelow is a list of valid modifiers for date and time functions in SQLite.
Continue readingIn PostgreSQL you can use the EXTRACT() function to get the month from a date.
You can also use the DATE_PART() function to do the same thing.
You can use the following code examples in PostgreSQL if you have a month number but you want the month name instead.
In PostgreSQL, if you already have a month name, but you want to convert that name to the month number, you can do this with the EXTRACT() function.
If you’re familiar with PostgreSQL, you might know that you can use the EXTRACT() and the DATE_PART() functions to extract the month from a date. But those functions only allow you to extract the month number.
What if you need the month name?
You can get the month name from a date by using the TO_CHAR() function. This function returns a string based on the timestamp and the template pattern you provide as arguments.
It can be easy to forget that the T-SQL FORMAT() function provides locale-aware formatting. Locale-aware means that the locale can affect the results. In other words, the exact output you get will depend on the locale.
By default, the function uses the language of the current session to determine the locale. However, this can be overridden by passing a “culture” argument to the function. Doing this allows you to provide results for a particular locale without having to change the language of the current session.
This article contains examples of how locale can affect the results when using the FORMAT() function in SQL Server.