datediff in postgresql

Extend the time functions in PHP DateDiff and DateAdd function DateDiff ($part, $begin, $end) {$diff = Strtotime ($end)-Strtotime ($begin); switch ($part) {case "Y": $retval = Bcdiv ($diff, (60 * 60 * 24 * 365)); Break Case "M": $retval = Bcdiv ($diff, (60 * 60 * 24 * 30)); Break Case "W": $retval = Bcdiv ($diff, (60 * 60 * 24 * 7)); Break Case "D": $retval = Bcdiv ($diff, (60 * 60 * 24)); Break Case

, $sec, $month, $day, $year); return $ret; } /**** simulate the DATEDIFF function in SQL Server ******* $part Type: string Value range: year,month,day,hour,min,sec Which part of the date to increase $date 1, $date 2 type: Timestamp Indicates: two dates to compare Return type: Numeric value End * (*************/ function DateDiff ($part, $date 1, $date 2) { $diff = $date 2-$date 1; $year 1=date ("Y", $date

DateDiff is commonly used to calculate date difference functions, using the following syntax:DATEDIFF (DatePart, StartDate, EndDate)Where parameter datepart has the following options (only common parameters are listed): DatePart Abbreviation Explain Year Yy,yyyy Years Month Mm,m Month Day Dd,d Days Week Wk,w Week

To SQLite both hate and love, in small projects, with SQLite developed very convenient, efficient enough. The drawback is that SQLite has streamlined some functions and related functions. such as stored procedures, DATEDIFF, does not support concurrent write and remote access (perhaps some experts say this is not a problem, with sharing or IIS can be resolved, but this is really solved?). ), leading to a lot of detours in the development process.The m

The DATEDIFF () function returns the number of days between two dates. Grammar DATEDIFF (Datepart,startdate,enddate) The StartDate and EndDate parameters are valid date expressions. Depending on the need to know how many days a specified date differs from January 1, 1, use DateDiff to get: The code is as follows Copy Code Print

I want to make a search today and use the time comparison function! In the past, it was usually a direct comparison time, and the query statement was not highly efficient ~~~ Later, I used the DateDiff function and found some problems during debugging. I would like to summarize a few of them and share them with you. ^_^ 1. Database problems. The Access and SQL read time functions are different. Now () can only be used in Access. In SQL, The GetDa

How to Use the datediff function in VB Datediff (interval, date1, date2 [, firstweekofyear [, firstweekofyear])Returns the value of variant (long), indicating the number of time intervals between two specified days.Interval: Set the unit of Period Calculation between two dates. For example,>Interval= "M" indicates that the calculation unit is month. >IntervalSuch:Yyyy> yearQ quarterM monthD DayW weekdayH

This article mainly introduces the code sharing of the DateDiff and DateAdd time functions implemented by php. DateDiff is used to calculate the two time intervals, and DateAdd is used to add the two time periods, for more information about how to extend the time functions DateDiff and DateAdd in php, see. function DateDiff