support -ve values

README.md

@@ -22,6 +22,9 @@ ms("5 days, 4hours and 3 minutes."); //return 446580000
 ms("446580000", {short: true}); //return 5d 4h 3m
 ms(446580000, {extended: true}); //return 5 days 4 hours 3 minutes
 ms(446580000); //return { days: 5, hours: 4, minutes: 3, seconds: 0}
+ms("-86400000"); //return {days: -1, hours: -0, minutes: -0, seconds: -0}
+ms("- 1 day"); //return -86400000
+ms("-21 days and 24 hours"); //returns -1900800000
 ```
 
 #### It supports almost every time units like 
@@ -40,6 +43,8 @@ days, day, d etc.
 ###### For years:
  years, year, yrs, y etc.
 
+
+##### -ve values are also supported. As you see in above examples.
 ## Contributing
 Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
 

main.js

@@ -33,9 +33,12 @@ module.exports = (val, options = {}) => {
     return timeValue;
   } else {
     const array = val.match(
-      /[0-9]+ *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)/gi
+      /(-?[0-9]+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)/gi
     );
-    const result = array.reduce((a, b) => (isNaN(a) ? ms(a) : a) + ms(b), '0s');
+    const result = array.reduce((a, b,) => 
+    (isNaN(a) ? ms(a): a) +
+    ((isNaN(a) ? ms(a): a) < 0 ? -ms(b):ms(b))
+    , '0s');
     return result;
   }
 };

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@shreyash21/ms",
-  "version": "1.1.2",
+  "version": "1.2.0",
   "description": "A better time converter for your projects.",
   "main": "main.js",
   "scripts": {