1
00:00:01,440 --> 00:00:04,630
Welcome back to Learn to Code and JavaScript in this lecture.

2
00:00:04,650 --> 00:00:06,000
We're going to start talking about dates.

3
00:00:06,990 --> 00:00:13,110
First thing I want to say about dates before we get into too far is that most people don't use the JavaScript

4
00:00:13,110 --> 00:00:13,590
dates.

5
00:00:13,920 --> 00:00:14,700
For the most part.

6
00:00:15,060 --> 00:00:21,840
They'll generally use a library such as Moment Jass, which provides a lot more solid date and time

7
00:00:21,840 --> 00:00:22,710
manipulation.

8
00:00:23,490 --> 00:00:28,770
But we'll take a look here and we will explain what the JavaScript dates are.

9
00:00:29,790 --> 00:00:39,720
So JavaScript data is stored as a number and it's milliseconds since January 1st, 1970 in UTC, which

10
00:00:39,720 --> 00:00:42,840
is the universal time coordinated or Greenwich Mean Time.

11
00:00:43,900 --> 00:00:47,950
So it's a number of milliseconds and before that, time is a negative number.

12
00:00:49,230 --> 00:00:52,590
So, again, most people use the moment, such as library.

13
00:00:52,680 --> 00:00:54,200
So what are the reasons for this?

14
00:00:54,990 --> 00:01:01,390
So in my experience, you can end up with dates that are numbers or objects or strings and with moments.

15
00:01:01,390 --> 00:01:05,460
Yes, it's just nice to have them be a moment object.

16
00:01:07,730 --> 00:01:09,290
So there's two common ways to create a date.

17
00:01:10,250 --> 00:01:16,370
One is to use the new date, which is a constructor, which will talk about more later.

18
00:01:16,880 --> 00:01:23,510
But the new date, you can just specify a string or other formats such as year, month, day, are minutes,

19
00:01:23,510 --> 00:01:24,690
seconds, milliseconds.

20
00:01:25,130 --> 00:01:26,390
You don't have to specify all those.

21
00:01:26,390 --> 00:01:29,210
You just say 20, 21, five, 12.

22
00:01:30,290 --> 00:01:31,490
And that creates a new date.

23
00:01:31,490 --> 00:01:32,540
Both those create a new date.

24
00:01:33,320 --> 00:01:35,120
Now, there's one issue.

25
00:01:35,210 --> 00:01:42,470
There's another issue why people don't like the JavaScript date, which is that the five is not May.

26
00:01:43,410 --> 00:01:50,070
It's June because the JavaScript months start with zero, so January is zero, so it's another thing

27
00:01:50,070 --> 00:01:51,050
called data.

28
00:01:51,090 --> 00:01:53,030
Now, it doesn't really create a date.

29
00:01:53,040 --> 00:01:56,740
It just returns the number of milliseconds since January 1st, 1970.

30
00:01:57,060 --> 00:02:01,650
And so all these are little reasons why people don't like the JavaScript date very much.

31
00:02:01,930 --> 00:02:05,790
So once you have a date, their instance methods, kind of like with strings.

32
00:02:07,530 --> 00:02:09,020
So here are some selected methods.

33
00:02:10,630 --> 00:02:16,990
So when you have a date such as my date, you say get a date, which gets the day of the month, one

34
00:02:16,990 --> 00:02:17,740
three 31.

35
00:02:18,740 --> 00:02:21,380
You say get full year, which gets the four digit year.

36
00:02:22,530 --> 00:02:28,450
And there's a bunch of other guests, as you can see here, get ours, 033, get milliseconds, zero

37
00:02:28,500 --> 00:02:36,210
nine nine nine minutes, get month, you get month is zero to 11, which is kind of confusing.

38
00:02:36,570 --> 00:02:40,500
Get second zero to fifty nine UTC hours.

39
00:02:41,340 --> 00:02:43,910
So get the hours and the UTC time zone.

40
00:02:44,190 --> 00:02:49,560
Let's say it's five o'clock in the Eastern Time zone, it might be ten o'clock at UTC.

41
00:02:50,040 --> 00:02:52,260
And then there's a bunch of set methods as well.

42
00:02:52,260 --> 00:02:55,110
Set month, set minute and so on.

43
00:02:55,830 --> 00:02:58,440
So let's look at some date examples in TVs code.