feat: adding JS documentation

index.js

@@ -1,11 +1,28 @@
 const GMT = require('node-gmt')
-const gmtHours = 'GMT-05:00'
 
+/**
+ * Retrieve a 0 before the first digit when the number is less than 10
+* @param {number} number
+* @returns {String} string
+*/
 const addCero = (num) => {
   return num < 10 ? `0${num}` : num
 }
 
-const getDateNow = (dateGetThem) => {
+/**
+ * Retrieve the date as format yyyy/mm/dd hh:mm:ss
+* @param {timestamp} date
+* @param {gmt hours} string
+* @returns {String} string
+*/
+module.exports = (dateGetThem, gmtHours) => {
+  if (dateGetThem !== undefined || dateGetThem) {
+    if (typeof dateGetThem === 'number') return -1
+    const valid = (new Date(dateGetThem)).getTime() > 0;
+    if (!valid) return -1
+  }
+  
+  gmtHours = !gmtHours ? 'GMT-00:00' : gmtHours
   const gmt = new GMT(gmtHours)
   let currentDate = (!dateGetThem) ? new Date() : new Date(dateGetThem)
   currentDate = gmt.relativeDate(currentDate)
@@ -19,8 +36,3 @@ const getDateNow = (dateGetThem) => {
   const yearMonthDay = `${year}/${addCero(month + 1)}/${addCero(date)} ${addCero(hour)}:${addCero(minutes)}:${addCero(seconds)}`
   return yearMonthDay
 }
-
-console.log(getDateNow())
-module.exports = {
-  getDateNow
-}