datediff

Given a date range, I need to know how many Mondays (or Tuesdays, Wednesdays, etc) are in that range. I am currently working in C#. Jon B Try this: static int CountDays(DayOfWeek day, DateTime start, DateTime end) { TimeSpan ts = end - start; // Total duration int count = (int)Math.Floor(ts.TotalDays / 7); // Number of whole weeks int remainder = (int)(ts.TotalDays % 7); // Number of remaining days int sinceLastDay = (int)(end.DayOfWeek - day); // Number of days since last [day] if (sinceLastDay < 0) sinceLastDay += 7; // Adjust for negative days since last [day] // If the days in excess of an

I need to calculate the difference (in days) between two dates in MySQL excluding weekends (Saturday and Sunday). That is, the difference in days minus the number of Saturday and Sunday in between. At the moment, I simply count the days using: SELECT DATEDIFF('2012-03-18', '2012-03-01') This return 17 , but I want to exclude weekends, so I want 12 (because the 3rd and 4th, 10th and 11th and 17th are weekends days). I do not know where to start. I know about the WEEKDAY() function and all related ones, but I do not know how to use them in this context. biziclop Illustration: mtwtfSSmtwtfSS

I have two columns: job_start job_end 2011-11-02 12:20:37.247 2011-11-02 13:35:14.613 How would it be possible using T-SQL to find the raw amount of time that has passed between when the job started and when the job ended? I tried this: select (job_end - job_start) from tableA but ended up with this: 1900-01-01 01:14:37.367 James Hill Take a look at the DateDiff() function. -- Syntax -- DATEDIFF ( datepart , startdate , enddate ) -- Example usage SELECT DATEDIFF(DAY, GETDATE(), GETDATE() + 1) AS DayDiff SELECT DATEDIFF(MINUTE, GETDATE(), GETDATE() + 1) AS MinuteDiff SELECT DATEDIFF(SECOND,

I'm looking to calculate the number of months between 2 date time fields. Is there a better way than getting the unix timestamp and the dividing by 2 592 000 (seconds) and rounding up whithin MySQL? The DATEDIFF function can give you the number of days between two dates. Which is more accurate, since... how do you define a month? (28, 29, 30, or 31 days?) Month-difference between any given two dates: I'm surprised this hasn't been mentioned yet: Have a look at the TIMESTAMPDIFF() function in MySQL. What this allows you to do is pass in two TIMESTAMP or DATETIME values (or even DATE as MySQL

There has to be an easier way to do this. I have objects that want to be refreshed every so often, so I want to record when they were created, check against the current timestamp, and refresh as necessary. datetime.datetime has proven to be difficult, and I don't want to dive into the ctime library. Is there anything easier for this sort of thing? if you want to compute differences between two known dates, use total_seconds like this: import datetime as dt a = dt.datetime(2013,12,30,23,59,59) b = dt.datetime(2013,12,31,23,59,59) (b-a).total_seconds() 86400.0 #note that seconds doesn't give you