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 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.
Continue readingIn 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.
In PostgreSQL, the justify_days() function allows you to adjust an interval value, so that 30-day time periods are represented as months.
For example, if you have an interval of say, 30 days, justify_days() will return it as 1 mon.