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SQL - Calculate time difference in Minutes, Hours, Days, Weeks, Months, Years for Posts / Notification

In this post I will show you how you can easily calculate time difference between two dates in seconds, minutes, hours, days, and even weeks, months and years in SQL.

This functionality can be used in notifications, emails, blog post etc

The key of this calculation is in Modulo operator, %. It returns the remainder (NOT the result!) of one number divided by another!


CREATE FUNCTION [dbo].[FN_GetTimeDifference] (@FromDate DATETIME, @ToDate DATETIME) RETURNS NVARCHAR(50) AS BEGIN DECLARE @Result NVARCHAR(50) SELECT @Result = CASE WHEN DATEDIFF(second, @FromDate, @ToDate) / 60 / 60 / 24 / 7 > 0 THEN CAST(DATEDIFF(second, @FromDate, @ToDate) / 60 / 60 / 24 / 7 AS NVARCHAR(50)) + ' weeks ago' WHEN DATEDIFF(second, @FromDate, @ToDate) / 60 / 60 / 24 % 7 > 0 THEN CAST(DATEDIFF(second, @FromDate, @ToDate) / 60 / 60 / 24 % 7 AS NVARCHAR(50)) + ' days ago' WHEN DATEDIFF(second, @FromDate, @ToDate) / 60 / 60 % 24 > 0 THEN CAST(DATE…

Pass multiple complex objects to Web API action

Working with ASP.NET Web API, the most unexpected thing is the limited support of POST data values to simple ApiController methods.

When a parameter has [FromBody], Web API uses the Content-Type header to select a formatter. At most one parameter is allowed to read from the message body. The reason for this rule is that the request body might be stored in a non-buffered stream that can only be read once.

A simple principle, you can send any content in HTTP request, it only need to be serializable into a string. So, it could be multiple JSON object. In this example, the content type is "application/json" and the request body is a raw JSON string (not a JSON object).

Here I found a workaround to pass multiple complex objects (using the above principle) from jquery to a WEB API using JObject, and then cast back to your required specific object type in api controller. This objects provides a concrete type specifically designed for working with JSON.

var customer = { "Name&q…