date-time - Code of Matt

List of 2020 Leap Day Bugs

The following is a list of many bugs caught on or near leap day, February 29th, 2020. Each link below references the issue with supporting details where available.

date-time

On the Life Cycle of a Leap Year Bug

Back in 2016, I wrote about leap year bugs. Since another leap year is almost here, I figure it's time to revisit the subject. I've gathered quite a bit of knowledge in this area since then. Hunting down leap year bugs has actually been part of

date-time

Please don't call it Epoch Time

Every so often, I'll come across a StackOverflow question or other Internet posting that says something like: > How do I get the epoch time? Or maybe: > I have an epoch time and I want to get the next day's epoch time. Or even better:

talks

CodeMash 2017

Today, I had the pleasure of speaking at CodeMash 2017. The slides for my talk, entitled "How to Have the Best Dates Ever!" are available here [https://www.dropbox.com/s/78gcn84zubbcvgz/Best%20Dates%20Ever.pdf?dl=1]. I also recorded the presentation, and you can watch it

leap-year

List of 2016 Leap Day Bugs

The following is a list of all the bugs caught during leap day, February 29th, 2016. Each link below references the issue with supporting details where available. If you're looking for information of how to avoid leap year bugs, or examples of disastrous leap year bugs from previous

leap-year

Happy New LEAP Year!

If you haven't realized it yet, 2016 is a leap year. For most people, this may just be an interesting oddity. An extra day to work or play. But for developers, the leap year can cause significant pain. It's January 1st as I'm writing

talks

.NET Rocks!

"Well, Richard..." "Yeah Buddy," "Guess what time it is?" "... I ... Don't ... Know !!!" "It's time to... uh.. to.. Hey, what the hell time is it anyway?!! What's going on!" "I used to know, or

talks

Hanselminutes

I was recently interviewed by Scott Hanselman for his Hanselminutes podcast. If you're interested in time, especially with .NET, I hope you will listen! Check it out in show #485 [http://www.hanselminutes.com/485/the-problem-with-datetime-nodatime-with-matt-johnson] .

JavaScript

JavaScript Date Parsing Changes in ES6

Do you know the difference between these two lines? var d1 = new Date("2015/06/17"); var d2 = new Date("2015-06-17"); How about these? var d1 = new Date("2015/06/17 00:00:00"); var d2 = new Date("2015-06-17 00:00:00"

.NET

Beware the Edge (cases) of Time!

Ahh, time zones. There are so many wonderful traps to fall into. Consider this bit of code, from a recent blog post by Rick Strahl [http://weblog.west-wind.com/posts/2015/Feb/10/Back-to-Basics-UTC-and-TimeZones-in-NET-Web-Apps] : /// <summary> /// Converts a local machine time to the user's timezone time /// by

.NET

Five Common Daylight Saving Time Antipatterns of .NET Developers

It's 2015, and Daylight Saving Time is just around the corner. For most of North America, the clocks will "spring-forward" on Sunday, March 8th, stealing an hour of precious time from our daily routine. A few weeks later, the same thing will occur in much of

time-zone

What is a Time Zone?

Almost any time you call up a friend, relative, or business associate in another part of the world, you'll realize that your time isn't always the same as their time, and the reason is "time zones". You probably know a little about time zones

RavenDB

Working with Date and Time in RavenDB

The following is an article I wrote for the knowledge base on the RavenDB web site [http://ravendb.net/] back in August of 2013. Recently, the site was revamped and the knowledge base was removed. Since the information is still relevant, I thought it would be worth republishing here. Enjoy!

talks

Pluralsight - Date and Time Fundamentals

I'm happy to announce that the video course I've been working on for Pluralsight, "Date and Time Fundamentals" [http://pluralsight.com/training/Courses/TableOfContents/date-time-fundamentals] has finally been released! Here's one of my favorite slides: But seriously - There's a

date-time

Handling Birthdays, and Other Anniversaries

How old are you? Simple question, yes? Perhaps. But the answer could change depending on the granularity of the question, and on your perspective. To answer "how many minutes old are you?", we need a lot more information than might be readily available: * Your date and exact time

Azure

Windows Azure Scheduler [part 2]

Yesterday, I posted about time zone issues with the new Windows Azure Scheduler [https://codeofmatt.com/2013/11/04/windows-azure-scheduler/]. Shortly after, I noticed a couple of additional issues that aren't time zone related at all. There is a section of the documentation that describes recurrence patterns: "

Azure

Windows Azure Scheduler

Microsoft announced today a new managed service for Windows Azure: The Windows Azure Scheduler [http://www.windowsazure.com/en-us/services/scheduler/]. This is basically an enterprise job scheduler, such as Quartz.net [http://quartznet.sourceforge.net/], but operated as a simple managed web service. Basically, you can set up a

talks

Desert Code Camp 2013.2

I'll be speaking at Desert Code Camp [http://nov2013.desertcodecamp.com/] on Saturday, November 9th, in Chandler, Arizona. I'm doing an insane 5 session marathon. If you live in the area, or care to visit, please consider one of my sessions: Date and Time Fundamentals [http:

RavenDB

Working with Date and Time in RavenDB

I've just completed a long overdue article about Date and Time in RavenDB. You can find the full text here [http://www.codeofmatt.com/2015/01/25/date-and-time-in-ravendb/]. I'm also very excited to announce support for Noda Time [http://nodatime.org] via my RavenDB-NodaTime [https://github.

JavaScript

JavaScript Date type is horribly broken

JavaScript dates have always been a bit funny. As a .Net developer, there was a bit of a mind-shift for me, because they are inherently different than types like DateTime or DateTimeOffset. But I won't spend too much time on what they are not, lets just talk about

.NET

The case against DateTime.Now

One of the first things most .NET developers learn to do with DateTime is to get the current value from the system clock. DateTime now = DateTime.Now; This is probably the most horrible introduction to date and time that you could have. In my less-than-humble opinion, this is one method

temporal data

All Things in Time

Let's face it, we live in a world that is governed by time. We describe all kinds of things with time at different scales. At one end of the scale we might measure the creation of the universe in terms of billions or trillions of years. At the