In PostgreSQL, the date_trunc() function truncates a date/time value to a specified precision.
It can also truncate the value to a specified precision in a specified time zone.
You could think of it as a date version of the trunc() function (which truncates numbers).
In PostgreSQL, you can convert a given date to its Julian day representation by using the to_char() function.
To do this, pass the date as the first argument, and 'J' as the second.
In PostgreSQL, you can use the timezone() function to convert a timestamp to another timezone.
According to the PostgreSQL documentation, there are two functions called to_timestamp():
More specifically, each function converts the value to a timestamp with time zone value.
Although the Postgres documentation presents them as two separate to_timestamp() functions, I present them as if they’re one function that accepts either one argument, or two.
In PostgreSQL, you can use the to_date() function to convert a string to a date.
In PostgreSQL, the current_timestamp() function returns the current date and time, including the time zone offset.
The timestamp returned is based on the start time of the current transaction.
In PostgreSQL, the localtimestamp() function returns the local date and time, without the time zone offset.
If you need the time zone offset, use current_timestamp() instead.
In PostgreSQL, the date_part() function retrieves subfields such as the year, month, hour, or minute, part from a date/time value.
It’s equivalent to the extract() function, although with a slightly different syntax.
In PostgreSQL, the extract() function retrieves subfields such as the year, month, hour, or minute, part from a date/time value.
It’s equivalent to the date_part() function, although with a slightly different syntax.
In PostgreSQL, the justify_interval() function adjusts an interval using justify_days and justify_hours. It allows you to use additional sign adjustments to adjust the interval.