In order to find the time of year, we can use lubridate::year and lubridate::quarter, which return the number of years and quarters between two dates, respectively. library(lubridate) toy_df$years <- as.numeric(as.period(interval(start = birthdate, end = givendate))$year) toy_df$quarters <- quarter(as.period(interval(start = birthdate, end = givendate))) # Print the resulting data frame toy_df birthdate givendate years quarters 1 1978-12-30 2015-12-31 37 4 2 1978-12-31 2015-12-31 36 4 3 1979-01-01 2015-12-31 36 1 4 1962-12-30 2015-12-31 53 4 5 1962-12-31 2015-12-31 52 4 6 1963-01-01 2015-12-31 52 1 7 2000-06-16 2050-06-17 50 2 8 2000-06-17 2050-06-17 49 2 9 2000-06-18 2050-06-17 49 2 10 2007-03-18 2008-03-19 1 1 11 2007-03-19 2008-03-19 1 1 12 2007-03-20 2008-03-19 0 1 13 1968-02-29 2015-02-28 47 4 14 1968-02-29 2015-03-01 47 1 15 1968-02-29 2015-03-02 47 2 We can also calculate the quarter of the year using lubridate::quarter which returns a value between 1 and 4, where:

Aligning a Bottom Constraint of One View to Another View in SwiftUI Introduction SwiftUI is a powerful framework for building iOS, macOS, watchOS, and tvOS apps. It provides a simple and expressive API for creating user interfaces, but sometimes it can be challenging to align views correctly. In this article, we will explore how to align a bottom constraint of one view to another view in SwiftUI. Understanding Constraints In SwiftUI, constraints are used to position and size views within their parent views.

Understanding and Optimizing Complex Joins in SQL Queries As a developer, working with complex joins can be a challenging task. When dealing with multiple tables and joins, it’s essential to understand the underlying mechanics of how these operations work and how to optimize them for better performance. In this article, we’ll explore how to modify a multi-join query that has issues when trying to add a new field without significantly impacting the number of records returned.

iOS Audio Playback Issues Introduction In this article, we’ll explore the challenges of playing audio files in an iOS app. We’ll examine the provided Stack Overflow question and offer a solution to help developers overcome common issues when working with audio playback. Understanding the Problem The provided code snippet attempts to play an MP3 file retrieved from a server using AVAudioPlayer. However, the playback fails, resulting in no sound being emitted, and an error message is logged.

Querying from Many-to-Many Relationship in Laravel Laravel is a popular PHP framework known for its simplicity, flexibility, and ease of use. One common issue developers face when working with many-to-many relationships is querying the data efficiently. In this article, we’ll explore how to query from many-to-many relationship tables using Laravel’s Eloquent ORM. Introduction to Many-to-Many Relationships In a many-to-many relationship, two models (in our case, Classes and Subjects) have a third model (often referred to as the pivot table) that acts as an intermediary between them.

Capturing Values Above and Below a Specific Row in Pandas DataFrames In this article, we’ll explore the concept of capturing values above and below a specific row in a Pandas DataFrame. We’ll delve into the world of data manipulation and discuss various techniques for achieving this goal. Introduction When working with data, it’s common to encounter scenarios where you need to access values above or below a specific row. This can be particularly challenging when dealing with large datasets or complex data structures.

Understanding Playback Time in iPhone Apps In this article, we will explore how to record the video played duration in an iPhone app using MPMoviePlayerViewController. We will delve into the technical details of playback time, discuss the limitations and alternatives of MPMoviePlayerViewController, and provide a step-by-step guide on how to achieve our goal. Introduction MPMoviePlayerViewController is a powerful tool for playing media files in iOS apps. It provides a user-friendly interface for playing videos and supports various features like playback control, progress tracking, and more.

Understanding Mail Icon Count Number on iOS Devices Introduction When developing for iOS devices, developers often face challenges in creating custom notifications and displaying them alongside native system elements. In this article, we’ll delve into the world of iOS notifications and explore how to display a mail icon count number on an iPad or iPhone using Swift. What is the Mail Icon Count Number? The mail icon count number refers to the small number displayed next to the Mail app icon on iOS devices.

Understanding Pandas DataFrames and Modifying Values Pandas is a powerful data analysis library in Python that provides high-performance, easy-to-use data structures and data analysis tools. One of the key data structures in pandas is the DataFrame, which is a two-dimensional table of data with rows and columns. In this article, we’ll explore how to add subsequent values to specific columns in a Pandas DataFrame. Introduction to Pandas DataFrames A Pandas DataFrame is a tabular data structure that stores data in a tabular format, similar to an Excel spreadsheet or a SQL table.

Understanding Background Gradients in iOS: A Step-by-Step Guide =========================================================== In this article, we’ll explore how to create a black gradient background for a view programmatically using iOS. We’ll delve into the technical details of creating gradients and discuss the best practices for implementing them in your apps. Overview of Gradient Creation A gradient is an image made up of two or more colors that gradate (or blend) smoothly into one another.