Minimal shiny app for investigating TZ issues

test-tz.R

#
# This is a Shiny web application. You can run the application by clicking
# the 'Run App' button above.
#
# Find out more about building applications with Shiny here:
#
#    http://shiny.rstudio.com/
#

library(shiny)
library(lubridate)

# Define UI for application that draws a histogram
ui <- fluidPage(

    # Application title
    titlePanel("Convert to Timezone"),

    # Sidebar with a slider input for number of bins
    sidebarLayout(
        sidebarPanel(
            selectInput("timezone",
                        "Timezone:",
                        choices = OlsonNames(),
                        selected = "Europe/Zurich")
        ),

        # Show a plot of the generated distribution
        mainPanel(
            textOutput("datetime")
        )
    )
)

# Define server logic required to draw a histogram
server <- function(input, output) {

    output$datetime <- renderText({
        format(dmy_hm("9 Feb 2023 9:00pm", tz = input$timezone), usetz = TRUE)
    })
}

# Run the application
shinyApp(ui = ui, server = server)