In my upcoming MVC4 application that will have a global audience, one of the features involves recording the date and time when a transaction is added or modified.
Since I am storing the transaction datetime in UTC format, what would be the most effective way to display the date as per user expectation on the client side?
Should I implement a JavaScript function for this purpose or handle it within the view itself?
When dealing with JavaScript date objects, it's important to note that they internally store time as the number of milliseconds since the epoch UTC (1970-01-01T00:00:00Z). To transfer time effectively, you can use this numerical representation:
// Representing 2012-09-16T10:30:00.000Z
var ms = 1347791400000;
// Creating a new date object using UTC milliseconds
var d = new Date(ms);
alert(d); // Displays equivalent local time, e.g. 2012-09-16T20:30:00GMT+1000
Another approach is passing a UTC timestamp, breaking it into components, and converting it to a date object using Date.UTC. Remember to adjust months by subtracting one from the calendar month number.
To obtain the UTC millisecond value for a given local time, utilize Date.prototype.getTime. For instance, in the example mentioned above:
alert(d.getTime()); // 1347791400000
When it comes to handling time zones, the approach you take really depends on your personal preferences. One option is to utilize the DateTimeOffset if you have the user's time zone stored in the database on the server side.
For example, you can refer to this article on Stack Overflow: Creating a DateTime in a specific Time Zone in c# fx 3.5.
Another method is to make use of the JavaScript getTimezoneOffset() Method, where you can set a cookie and retrieve it on the server. Additionally, there are various client libraries that can be helpful, especially if you're working with client templating.
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