SQLite supports five functions for working with dates and times. These are:
All of these functions accept a time string as an argument. They also accept other arguments for modifying/formatting the output.
The strftime() function is the most versatile function of the five. In fact, this function can do everything the other four can.
In other words, you could use strftime() for all your date and time formatting requirements. The other four functions are available solely for convenience.
The SQLite strftime() function enables you to return a date and time value in a specified format.
The actual date/time value returned is based on a time string that you provide as an argument when you call the function, as well as any modifiers you include (as optional arguments). A modifier allows you to change the date, such as add a number of days, set it to local time, etc
Continue readingThe SQLite julianday() function returns the number of days since noon in Greenwich on November 24, 4714 B.C. (using the Proleptic Gregorian calendar).
If using the proleptic Julian calendar, this is Monday, January 1, 4713 BC.
Julian day is the continuous count of days since the beginning of the Julian Period. It’s typically used by astronomers, software, etc to calculate elapsed days between two events.
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 SQLite datetime() function enables you to return a date and time value based on a time string and any modifiers.
It returns the date in this format: YYYY-MM-DD 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 date, such as add a number of days, set it to local time, etc
Continue readingSQLite 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.