From 4574b93443a22bcf31e9bdc266c4da86a9c47281 Mon Sep 17 00:00:00 2001
From: lucianm05 <lucianmg05@gmail.com>
Date: Wed, 25 Jan 2023 11:44:10 +0200
Subject: [PATCH] fix: add/subtract business days infinite loop

---
 src/index.ts | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/index.ts b/src/index.ts
index ac36bc7..a4992fd 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -88,11 +88,18 @@ const businessTime = (
   ) {
     let daysToIterate = numberOfDays;
     let day = date.clone();
+    let internalAction = action;
+
+    if (numberOfDays < 0) {
+      if (action === 'add') internalAction = 'subtract';
+      if (action === 'subtract') internalAction = 'add';
+    }
 
     while (daysToIterate) {
-      day = day[action](1, 'day');
+      day = day[internalAction](1, 'day');
       if (day.isBusinessDay()) {
-        daysToIterate = daysToIterate - 1;
+        if (daysToIterate < 0) daysToIterate = daysToIterate + 1;
+        else daysToIterate = daysToIterate - 1;
       }
     }
 
@@ -374,7 +381,7 @@ const businessTime = (
           break;
         } else if (from.isSameOrAfter(start) && from.isSameOrBefore(end)) {
           diff += end.diff(from, 'minutes');
-        } 
+        }
       }
 
       return diff ? diff * multiplier : 0;