09 Date and Time in JS

Learned about Date and Time in Javascript and some methods related to Dates (Converting it into more readable format), declaring specific date, time stamps, converting from millisec to sec e.t.c.

Author: aayushyadavz

01_Basics/08_nums_and_maths.js

@@ -16,7 +16,7 @@ const newBalance = new Number(400)
 // Some Methods,
 // console.log(newBalance.toString()); // Output: 400 
 // Note: When we will check it's typeof the we will see that it is changed into strings.
-// console.log(newBalance.toString().length); // Output: 3 (cause 100 has 3 chracters.)
+// console.log(newBalance.toString().length); // Output: 3 (cause 400 has 3 chracters.)
 
 // console.log(newBalance.toFixed(2)); // Output: 400.00
 
@@ -33,7 +33,7 @@ const hundreds = 1000000
 
 (ii) Maths, */
 console.log(Math); /* Output: Object [Math] {} 
-Note: When we run this console.log(Math) in browser's console we will get value under object. */
+Note: When we run this console.log(Math) in browser's console we will get many value inside object. */
 
 console.log(Math.abs(-4)); // Output: 4 (Changes only minus values in plus)
 
@@ -47,7 +47,7 @@ Note: There is also "max". */
 
 console.log(Math.random()); // Output: 0.36675387800250636 (Gives random numbers between 0 & 1)
 console.log((Math.random()*10) + 1); // Now numbers will range from 1 to 9
-console.log(Math.floor(Math.random()*10) + 1); // Round offs at Random numbers at lowest value.
+console.log(Math.floor(Math.random()*10) + 1); // Round offs the Random numbers at lowest value.
 
 const min = 10
 const max = 20

01_Basics/09_datesIn.js

@@ -0,0 +1,61 @@
+/* 9. Dates
+
+Note: Our declared Dates has been calculated from 1 January 1970.
+Note: Dates has been calculated usually in Milliseconds. */
+
+let myDate = new Date();
+console.log(myDate); /* Output: 2024-04-24T08:15:11.671Z
+
+--------------------------------------------------------------------------------------
+
+Conversion of Dates in readable form,
+Some Methods, */
+console.log(myDate.toString()); // Output: Wed Apr 24 2024 13:47:36 GMT+0530 (India Standard Time)
+console.log(myDate.toDateString()); // Output: Wed Apr 24 2024
+console.log(myDate.toLocaleString()); // Output: 24/4/2024, 1:49:14 pm
+console.log(myDate.toJSON()); // Output: 2024-04-24T08:20:04.530Z
+console.log(myDate.toISOString()); // Output: 2024-04-24T08:21:49.915Z
+console.log(myDate.toLocaleDateString()); /* Output: 24/4/2024
+
+--------------------------------------------------------------------------------------
+
+Typeof Date, */
+console.log(typeof myDate); /* Output: Object
+
+--------------------------------------------------------------------------------------
+
+Declaring a new or a specific date, */
+// let myCreatedDate = new Date(2002, 10, 24) // Months starts with 0 in JS.
+// console.log(myCreatedDate.toDateString()); // Output: Sun Nov 24 2002
+// let myCreatedDate = new Date(2002, 10, 24, 5, 3)
+// console.log(myCreatedDate.toLocaleString()); // Output: 24/11/2002, 5:03:00 am
+let myCreatedDate = new Date("11-24-2002")
+console.log(myCreatedDate.toLocaleString()); /* Output: 24/11/2002, 5:30:00 am
+
+-------------------------------------------------------------------------------------- */
+
+let myTimeStamp = Date.now()
+console.log(myTimeStamp); // Output: 1713948664801 (Millisecond value from 1 Jan 1970 to current)
+console.log(myCreatedDate.getTime()); /* Output: 1038076200000 
+So now we can easily compare 1713948664801 and 1038076200000.
+
+Converting it into seconds, */
+console.log(Math.floor(Date.now()/1000)); // Output: 1713950199
+
+let myDates = new Date()
+console.log(myDates);
+console.log(myDates.getDay()); // Output: 3
+console.log(myDates.getMonth() + 1); /* Output: 4
+
+----------------------------------------------------------------------------------------
+
+Some other syntax, */
+`${myDates.getDay()} and the time is`
+// We can completely define what we want,
+myDates.toLocaleString('default', {
+    weekday: "long"
+})
+
+
+
+