how to subtract time with seconds

SelectTimediff ('23:40:00','18:30:00'); --subtract two time select substring (Timediff ('23:40:00','18:30:00'),1,5) ----“ to：Ten"Subtract back hours: minutesSelectDateDiff'2008-08-08','2008-08-01'); --7-----Two date subtractionSelectTo_days ('2008-09

1. MySQL adds a time interval for the date: Date_add ()Set @dt = Now ();Select Date_add (@dt, Interval 1 day); -Plus 1 daysSelect Date_add (@dt, interval 1 hour); -Plus 1 hoursSelect Date_add (@dt, interval 1 minute); -Plus 1 minutesSelect Date_add (

Article LuxianghaoArticle Source: http://www.cnblogs.com/luxianghao/p/6339470.html reprint Please specify, thank you for your cooperation.Disclaimer: The content of the article represents only personal opinions, if not, please correct me.---Why do

Before we know that SQL has the DateDiff () function, we need to calculate the date and time difference. I will directly put it in a program like php, asp, and asp.net for calculation, now I will share with you how to use the DateDiff function to

NET (C #) Time subtraction gets days, hours, minutes, seconds difference datetime dtone = Convert.todatetime ("2007-1-1 05:00:00"); DateTime dtwo = Convert.todatetime ("2007-1-5 08:00:00"); TimeSpan span = Dtone. Subtract (Dtwo); The

//specify time minus 2 secondsfunctionReducetwos (DATESTR) {//datestr format is yyyy-mm-dd hh:mm:ssvardt=NewDate (Datestr.replace (/-/, "/"));//converts an incoming date format string to a Date object compatible with IE //var dt=new date (DATESTR);/

This is a creation in Article, where the information may have evolved or changed. 1. Preface Time includes time values and time zones, and there are incomplete and ambiguous times when you do not include timezone information. When transmitting or

A TimeSpan structure represents a time interval.Namespaces: SystemAssembly: mscorlib (in mscorlib.dll)The 1.DateTime value type represents a specific date time from January 1, 01 0:0 0 seconds to the December 31, 9999 23:59 59 seconds. Therefore,

Turn from:A TimeSpan structure represents a time interval.Namespaces: SystemAssembly: mscorlib (in mscorlib.dll)The 1.DateTime value type represents a specific date time from January 1, 01 0:0 0 seconds to the December 31, 9999 23:59 59 seconds.

Namespaces: SystemAssembly: mscorlib (in mscorlib.dll)The 1.DateTime value type represents a specific date time from January 1, 01 0:0 0 seconds to the December 31, 9999 23:59 59 seconds. Therefore, you can use a DateTime value type to describe any