diff --git a/content/posts/adventofctf/challenge_19.md b/content/posts/adventofctf/challenge_19.md
index 9001d2f..d71ec67 100644
--- a/content/posts/adventofctf/challenge_19.md
+++ b/content/posts/adventofctf/challenge_19.md
@@ -1,7 +1,7 @@
 +++
 author = "Maik de Kruif"
 title = "Challenge 19 - AdventOfCTF"
-date = 2021-02-25T23:18:28+23:00
+date = 2021-02-25T23:18:28+01:00
 description = "A writeup for challenge 19 of AdventOfCTF."
 cover = "img/adventofctf/d80f13d1ab714f7864c2a9ef56c5f767.png"
 tags = [
diff --git a/content/posts/adventofctf/challenge_20.md b/content/posts/adventofctf/challenge_20.md
index 6baa975..5aa27e0 100644
--- a/content/posts/adventofctf/challenge_20.md
+++ b/content/posts/adventofctf/challenge_20.md
@@ -1,7 +1,7 @@
 +++
 author = "Maik de Kruif"
 title = "Challenge 20 - AdventOfCTF"
-date = 2021-02-26T00:11:35+23:00
+date = 2021-02-26T00:11:35+01:00
 description = "A writeup for challenge 20 of AdventOfCTF."
 cover = "img/adventofctf/c1f93b6ee2e1cd25ea02f9a78c364b12.png"
 tags = [
diff --git a/content/posts/adventofctf/challenge_21.md b/content/posts/adventofctf/challenge_21.md
index 2ea5e73..6119cf2 100644
--- a/content/posts/adventofctf/challenge_21.md
+++ b/content/posts/adventofctf/challenge_21.md
@@ -1,7 +1,7 @@
 +++
 author = "Maik de Kruif"
 title = "Challenge 21 - AdventOfCTF"
-date = 2021-02-26T11:45:53+23:00
+date = 2021-02-26T11:45:53+01:00
 description = "A writeup for challenge 21 of AdventOfCTF."
 cover = "img/adventofctf/a4afd1fffb0b662d849a6907767f0625.png"
 tags = [