- Dates And DateFormatter In Swift – LearnAppMaking
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- Swift Date Timezone
- Swift Date From String
Swift Date Time Formatting Overview Swift is a programming language for macOS, iOS, watchOS and tvOS. Chances are if you are developing a mobile app for iphones, ipads or iwatches, you’ll need to learn swift. Date Time Formatting in Swift is based off of the DateFormatter class which can be used to manipulate dates and. Mar 16, 2020 That’s the ISO 8601 date/time format, represented with the ISO8601DateFormatter class in Swift (and use UTC/GMT). Here’s how you can print the current date/time: let now = Date let formatter = ISO8601DateFormatter let datetime = formatter.string(from: now) print (datetime) // Output: 2020-03-13T14:29:52Z. Now that we know a bit about Date and DateComponents, let’s actually get a readable date in our Swift app, shall we? This is the job of DateFormatter. DateFormatter is a class that can take a Date, and output a String describing that time/date as its format instructions dictate.
Date And Time Formatting Resources
Welcome to the Date Time Formatting Resources site! We have found that when working with any sort of code, the question of how to format dates and times usually comes up. We created this site as a knowledge base for date and time formatting in any language. We will be constantly updating the site as the list of coding languages is ever growing. For now, here are all the languages we have resources available for:
How To Format Date Time In Kotlin
Kotlin Date Time Formatting Overview Kotlin is a programming language that allows you to write Android apps and program “happier”. Chances are if you are developing a mobile app for Android-based phones, tablets and watch you’ll need to learn Kotlin. Date Time Formatting in Kotlin is based on the SimpleDateFormat class and also the DateTimeFormatter class which […]
How To Format Date Time In C#
Nova ide. C# Date Time Formatting Overview C# is a programming language that is owned and developed by Microsoft that allows you to build applications on the .net framework. Date Time Formatting in C# is based off of the ToString function that supports various patterns to display the date and time as desired. More Documentation for C# date […]
How To Format Date Time In Swift
Swift Date Time Formatting Overview Swift is a programming language for macOS, iOS, watchOS and tvOS. Chances are if you are developing a mobile app for iphones, ipads or iwatches, you’ll need to learn swift. Date Time Formatting in Swift is based off of the DateFormatter class which can be used to manipulate dates and […]
Dates And DateFormatter In Swift – LearnAppMaking
Date Time Javascript Libraries
Formatting Date Time With Javascript Libraries Moment JS Moment.js is a Date Time Javascript Library that can parse, validate, manipulate, and display dates and times in JavaScript. To download Moment.js, please visit the Moment.js website for the latest version. Installation To add Moment.js to your site, either download the latest version and upload it to your […]
How To Format Date Time In Javascript
Javascript Date Time Formatting Documentation In Javascript, you can represent a single moment in time by instantiating a Date object. Javascript will use the browsers date and time by default when choosing what moment in time to use. Although many people choose to use Javascript to format dates, there are plenty of Javascript Libraries that […]
How To Format Date Time In WordPress
Formatting Date and Time in WordPress Overview In WordPress, displaying the date and time is often done via using the the_date() and the_time() functions in your PHP code. These functions accept a format string parameter that allows you to determine how the date is going to be displayed. To change how the date and time is […]
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How to Format Date Time In Java 8
Swift Date Timezone
Java 8 Date Time Formatting Overview Java 8 no longer uses the SimpleDateFormat Class that was used in Java SE 7. Java SE 8 implements a class called DateTimeFormatter that allows you to print and parse date time objects. If you are looking to format datetime in Android or Kotlin, please check out our page dedicated to […]
How to Format Date Time In Java 7
Java 7 Date Time Formatting Overview Java 7 SimpleDateFormat allows you to define patterns for date and time formatting to manipulate the display of the data. If you are looking to format datetime in Android or Kotlin, please check out our page dedicated to Kotlin Date Time Formatting. Further documentation for the SimpleDateFormat Java […]
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Date Time Formatter Resources
Date And Time Formatting Resources Welcome to the Date Time Formatting Resources site! We have found that when working with any sort of code, the question of how to format dates and times usually comes up. We created this site as a knowledge base for date and time formatting in any language. We will be […]
With daylight savings time being a few days old now for 2019 I thought I would put together a small tutorial on how to convert dates by timezone in Swift. There are two approaches that I generally use when converting dates, the first is to use a Foundation's DateFormatter, and the second is to perform an Epoch calculation based upon your current timezone offset. The advantage of using the DateFormatter approach is that dates can easily be displayed or evaluated with other like dates, just keep in mind that the timezone offset will be displayed at the end of the date with a + or - and then the hour offset to GMT. For example, my timezone offset is -0500 for America/Chicago at the time of writing this tutorial. This means I am minus 5 hours from GMT. The DateFormatter approach is also inline with how you will see most code written out in the macOS / iOS ecosystem, so there is consistency there in using this approach. The advantage of using the Epoch calculation approach is for performing a lot of date calculations that are all at 0-GMT, or zero GMT. An example of this might be dates coming in from the server. To avoid timezone confusion dates from the server are often set to 0-GMT and can be computed this way against other Epoch dates in your program. Once the data has been computed it can be converted to local datetimes for display purposes. Just remember, that unlike the DateFormatter approach, Epoch calculation dates are computed at +0000, or zero GMT. More on this in a bit, let's dive into the two approaches with some code!
Standard Approach, using a DateFormatter() ?
As mentioned, the DateFormatter approach set's up the timezone, set's up the string format for the date, and then uses the formatter to provide the string from Foundation's date object! Looking at this a bit more in-depth, notice that the timeZone on the formatter is set to the .current timeZone. This will be set to .current by default, but it is important to note in case you need to set anything other that the current timeZone that you exist in. Also notice that the date format being set has the 'T' and Z characters in it. This tells the DateFormatter to include timeZone offset in hours. So, in the case of this post, the Z will represent -0500 at the end of the date format.
Alternative Approach using Epoch Calculation. ?
The Epoch calculation approach subtracts the total timezone offset in seconds from the Date() object given by Foundation. This calculation will result in an Epoch date that can be converted to a Date object using the timeIntervalSince1970 API. The key difference between the DateFormatter version and the Epoch calculation is that the Epoch calculation provides the date format as +0000 instead of -0500. Which means nothing for display purposes, but for evaluation purposes, it's a key difference because this means you local date is at 0-GMT.
In Summary ⌛️
Swift Date From String
I hoped you have learned more about performing date calculations in your application using Swift. If you are new to this topic I would absolutely use the DateFormatter approach first and then try out the Epoch calculation approach, only if needed. Just remember that when dates are calculated, it is crucial to always pay attention to the +0000 or -0500 at the end of the date. This will tell you the timeZone offset and let you know why you are seeing something you may not be expecting when you compare or evaluate two dates. I hope you enjoyed reading this, please leave a comment if you have any questions, comments, or concerns.