Rmd knits to html instead of PDF - latex

Question

I have compiled an Rmd file that should knit to PDF, whereof the code is derived from another model which does knit to pdf. However, with the exact same yaml header parameters, the knitting defaults to HTML instead of pdf for the first model (When clicking 'knit to pdf'. I am using R version 3.6.1.
---
title: "Title"
subtitle: "Subtitle"
author:
- Piet en Henk
date: "`r format(Sys.time(), '%B %d, %Y')`"
abstract: "This document provides the description of the used R code for ...."
geometry: "left=1in, right=1in, top=1in, bottom=1in, headsep=0.4in"
output:
pdf_document:
highlight: zenburn
number_sections: true
toc: true
toc_depth: 2
header-includes:
- \usepackage{eso-pic}
- \usepackage{graphicx}
- \usepackage{transparent}
- \usepackage{fancyhdr}
- \usepackage{datetime}
- \usepackage{hyperref}
- \usepackage{float}
- \usepackage{amsmath}
- \usepackage{courier}
- \usepackage{placeins}
- \pagestyle{fancy}
- \numberwithin{figure}{section}
- \newdateformat{mydate}{\monthname[\THEMONTH] \THEYEAR}
- \renewcommand{\headrulewidth}{1pt}
- \renewcommand{\footrulewidth}{0.5pt}
- \fancyhead[L]{\includegraphics{Company.png}}
- \fancyfoot[RO]{Company}
- \fancyfoot[L]{Version 1.0}
---
```{=latex}
% Trigger ToC creation in LaTeX
\renewcommand{\baselinestretch}{0.7}\normalsize
\renewcommand{\baselinestretch}{1.2}\normalsize
\tableofcontents
```
\pagebreak
And the loggings from the Rmarkdown pane:
processing file: index.Rmd
|......................................................................| 100%
inline R code fragments
output file: index.knit.md
"C:/Program Files/RStudio/bin/pandoc/pandoc" +RTS -K512m -RTS index.knit.md --to html4 --from markdown+autolink_bare_uris+tex_math_single_backslash --output index.html --lua-filter "C:\PROGRA~1\R\R-36~1.1\library\bookdown\RMARKD~1\lua\CUSTOM~1.LUA" --lua-filter "C:\PROGRA~1\R\R-36~1.1\library\RMARKD~1\RMARKD~1\lua\PAGEBR~1.LUA" --lua-filter "C:\PROGRA~1\R\R-36~1.1\library\RMARKD~1\RMARKD~1\lua\LATEX-~1.LUA" --metadata-file "C:\Users\mpruijs\AppData\Local\Temp\2\RtmpER5E5P\file2bec2a1279b1" --wrap preserve --standalone --section-divs --table-of-contents --toc-depth 3 --template "C:\PROGRA~1\R\R-36~1.1\library\bookdown\TEMPLA~1\GITBOO~1.HTM" --highlight-style pygments --number-sections --css style.css --include-in-header "C:\Users\mpruijs\AppData\Local\Temp\2\RtmpER5E5P\rmarkdown-str2bec4d551488.html" --mathjax
Output created: index.html
Warning message:
In as.POSIXlt.POSIXct(x, tz) : unable to identify current timezone 'C':
please set environment variable 'TZ'