Subtract arguments, producing a “ symbolic” result that uses years and months, rather than just daysĪge(timestamp '', timestamp '') → 43 years 9 mons 27 days Subtract timestamps (converting 24-hour intervals into days, similarly to justify_hours()) Subtract dates, producing the number of days elapsed Also, the + and * operators come in commutative pairs (for example both date + integer and integer + date) we show only one of each such pair. For brevity, these variants are not shown separately. Similarly, a date value is assumed to represent midnight in the TimeZone zone when comparing it to a timestamp.Īll the functions and operators described below that take time or timestamp inputs actually come in two variants: one that takes time with time zone or timestamp with time zone, and one that takes time without time zone or timestamp without time zone. When comparing a timestamp without time zone to a timestamp with time zone, the former value is assumed to be given in the time zone specified by the TimeZone configuration parameter, and is rotated to UTC for comparison to the latter value (which is already in UTC internally). Dates and timestamps (with or without time zone) are all comparable, while times (with or without time zone) and intervals can only be compared to other values of the same data type. In addition, the usual comparison operators shown in Table 9.1 are available for the date/time types. You should be familiar with the background information on date/time data types from Section 8.5. For formatting functions, refer to Section 9.8. Table 9.32 illustrates the behaviors of the basic arithmetic operators ( +, *, etc.). Table 9.33 shows the available functions for date/time value processing, with details appearing in the following subsections. If the time zone isn’t specified, the current time zone is used.Ĭurrent date and time (like clock_timestamp, but as a text string).Ĭonvert Unix epoch (seconds since 00:00:00+00) to timestamp.9.9.1. Functions and DefinitionĬurrent date and time (start of current transaction).Īdjust interval so 30-day time periods are represented as months.Īdjust interval so 24-hour time periods are represented as days.Īdjust interval using justify_days and justify_hours, with additional sign adjustments.Ĭreate date from year, month and day fields.Ĭreate interval from years, months, weeks, days, hours, minutes and seconds fields.Ĭreate time from hour, minute and seconds fields.Ĭreate timestamp from year, month, day, hour, minute, and seconds fields.Ĭreate timestamp with time zone from year, month, day, hour, minute, and seconds fields. Take extra care when migrating temporal logic to Aurora PostgreSQL paradigms. While some of the functions appear to be similar to those in SQL Server, the functionality is significantly different. PostgreSQL UsageĪmazon Aurora PostgreSQL-Compatible Edition (Aurora PostgreSQL) provides a very rich set of scalar date and time functions more than SQL Server. Style 112 (ISO) with no separtors.įor more information, see Date and Time functions in the SQL Server documentation. SELECT CAST (GETDATE() AS DATE) SELECT CONVERT (VARCHAR(20), GETDATE(), 112)ĭefault date format. Returns a datetime value that is calculated with an offset interval to the specified DATEPART of a date.Ĭonverts datetime values to and from string literals and to and from other datetime formats. How many days left until end of the month. SELECT DATEDIFF(DAY, GETDATE(), EOMONTH(GETDATE())) Returns an integer value of DATEPART boundaries that are crossed between two dates. Return an integer value representing the specified DATEPART of a specified date. Return a datetime value that contains the current local or UTC date and time.
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