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Julia Programming Projects

You're reading from   Julia Programming Projects Learn Julia 1.x by building apps for data analysis, visualization, machine learning, and the web

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Product type Paperback
Published in Dec 2018
Publisher Packt
ISBN-13 9781788292740
Length 500 pages
Edition 1st Edition
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Author (1):
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Adrian Salceanu Adrian Salceanu
Author Profile Icon Adrian Salceanu
Adrian Salceanu
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Table of Contents (13) Chapters Close

Preface 1. Getting Started with Julia Programming FREE CHAPTER 2. Creating Our First Julia App 3. Setting Up the Wiki Game 4. Building the Wiki Game Web Crawler 5. Adding a Web UI for the Wiki Game 6. Implementing Recommender Systems with Julia 7. Machine Learning for Recommender Systems 8. Leveraging Unsupervised Learning Techniques 9. Working with Dates, Times, and Time Series 10. Time Series Forecasting 11. Creating Julia Packages 12. Other Books You May Enjoy

Constructing dates and times


In order to construct new date/time objects representing the current date or time, Julia provides two helper functions, now and today. Let's look at some examples in the read-eval-print loop (REPL):

julia> using Dates 
 
julia> d = today() 
2018-11-08 

julia> typeof(d) 
Date 

julia> dt = now() 
2018-11-08T16:33:34.868 

julia> dt |> typeof 
DateTime  

julia> t = Dates.Time(now()) 
16:34:13.065 

julia> typeof(t) 
Time

The now function can also accept an additional argument to return the UTC time (without local adjustments for daylight savings):

julia> now(UTC) 
2018-11-08T15:35:08.776

Internally, all the types wrap an Int64 value that can be accessed through the instant field:

julia> dt.instant 
Dates.UTInstant{Millisecond}(63677378014868 milliseconds) 

julia> t.instant 
75147529000000 nanoseconds 

julia> d.instant 
Dates.UTInstant{Day}(737006 days)

The instant property of the objects reflects the precision level of each type...

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