From ca8dec754c841fb15389c919d14b91938fc58bb0 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Thu, 15 Sep 2016 12:40:32 +1200
Subject: Raise error on downtime ending before it starts

---
 nagios-downtime | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/nagios-downtime b/nagios-downtime
index 6493dcf..46de12e 100755
--- a/nagios-downtime
+++ b/nagios-downtime
@@ -108,6 +108,13 @@ if ((dtn > dtb)) ; then
     exit 1
 fi
 
+# If the end time is less than the start time, this is definitely a mistake
+if ((dta > dtb)) ; then
+    printf '%s: Refusing to schedule downtime that ends (%s) before it starts (%s)\n' \
+        "$self" "$(date -d @"$dtb" +%c)" "$(date -d @"$dta" +%c)"
+    exit 1
+fi
+
 # Quietly replace semicolons in comment with commas
 comment=${comment//;/,}
 
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