Back-End Programming Exam > Back-End Programming Videos > Perl Building Blocks: An Introduction to Perl > Perl Tutorial - 42: Working with Date & Time Values
Perl Tutorial - 42: Working with Date & Time Values Video Lecture | Perl Building Blocks: An Introduction to Perl - Back-End Programming
FAQs on Perl Tutorial - 42: Working with Date & Time Values Video Lecture - Perl Building Blocks: An Introduction to Perl - Back-End Programming
| 1. How can I get the current date and time in Perl? |  |
Ans. In Perl, you can use the built-in function `localtime()` to get the current date and time. It returns a list of values representing the current time, including the seconds, minutes, hours, day of the month, month, year, and more.
| 2. How can I format a date and time value in Perl? | |
Ans. To format a date and time value in Perl, you can use the `strftime()` function from the `POSIX` module. This function allows you to specify a format string that defines how the date and time should be formatted. For example, `%Y-%m-%d %H:%M:%S` represents the format "YYYY-MM-DD HH:MM:SS".
| 3. How can I convert a Unix timestamp to a readable date and time in Perl? | |
Ans. To convert a Unix timestamp (number of seconds since January 1, 1970) to a readable date and time in Perl, you can use the `localtime()` function in conjunction with the `strftime()` function. First, pass the Unix timestamp to `localtime()` to get the individual date and time components, and then use `strftime()` to format them as desired.
| 4. How can I add or subtract a specific duration from a date and time value in Perl? | |
Ans. In Perl, you can use the `DateTime` module to perform date and time calculations. This module provides various methods to add or subtract a specific duration from a date and time value. For example, you can use the `add()` method to add a duration, or the `subtract()` method to subtract a duration from a `DateTime` object.
| 5. How can I compare two date and time values in Perl? | |
Ans. To compare two date and time values in Perl, you can use the overloaded comparison operators (`<`, `<=`, `>`, `>=`, `==`, `!=`) with `DateTime` objects. These operators compare the date and time values based on their chronological order. Additionally, the `DateTime` module provides other comparison methods such as `compare()`, which returns -1, 0, or 1 based on the comparison result.
Text Transcript from Video
hello guys welcome to my channel this is
the 40 second tutorial in this course
and in this tutorial we'll be talking
about the local time function in Perl
and basically this is at all about date
and time values and you know how we can
retrieve the current time and displayed
in a way that is easy to understand so
as you can see I have a script opened up
here it's called date underscore time
and in this script on line number three
I have created the list variable in a
rebel called months and it has the short
forms for month names so Jan Feb March
April right up till December and then on
line number four I have created another
list variable called week and this has
the short names four days a week so I
have Sunday Monday Tuesday up till
Saturday and then on line number five I
have made a call to the local time
function over here and you call it by
just typing local time and a set of
parentheses and I have saved the output
from that function in another list
variable called my underscore date time
and then on line number six I have used
a print statement to just see the
contents of my underscore date time and
if I would run the script the way it is
right now let me press f5 so we see that
we get a string of numbers and then we
see the current time in the condit but
we haven't really gotten to that part of
the script yet so I'm not going to talk
about that output we're gonna run this
program again and check out the output
and then talk about in more detail but
for the time being you ought know that
the local time function converts you
know the time that is specified by expr
in a list context and it returns a nine
element array and you know if you have
nine element array then basically you
have subscripts from 0 till 8 and the
subscript 0 is 4 seconds you know the
one the first subscript is 4 minutes the
second subscript is four R's 3 is 4
you know day of the month the fourth is
four month fifties four year sixties day
of the week seventh is day of the earth
and eight is I don't know what the 8th
subscript is for I've forgotten but
anyway we're not gonna get to that part
so to retrieve the individual values I
have feared variables and I've stored
those values in the variables thus
created so to store the seconds I have
created a variable called seconds and as
I said the second value is stored at the
zero subscript so you make a call to the
list variable which is minus court date
time and square brackets you pass zero
so the second value would be stored in
the seconds variable
similarly minutes value would be stored
in the minutes variable and then ours
are stored at position two so minder
scored eight times square brackets two
that's going to get you the arse and
then day of the month at three the month
value is at subscript 4 and then the
year value is actually you know 1900 is
considered as a base so the ear value
that you get is you know whatever value
is there after 1900 so if you were to
see the current year then you would have
to basically add 1900 to it because
that's the base and then you know for
sure day of the week it returns a
numeric value and if you want to see you
know a value like Sunday Monday Tuesday
and so forth then you would have to
basically use an array variable like the
one that I have created here and I have
done that for months as well actually
because you know you get the value as a
numeric index and if you have an array
variable like this and you could just
use the value as a subscript for this
array and you would get the
corresponding month value and then
finally you know after creating all
these variables I am using two print
statements one on line number 15 the
other one on line number 16 I'll run the
script and this is the output that we
get this is the raw string that's
returned by
xpr and then this is the current time
1:11 and this is the current date so you
know it's Friday March 11 2016 we see
all the values that we have fetched so
that's it for this tutorial I hope you
guys had fun watching this one you may
subscribe to my channel if you haven't
already I'm gonna see you in the next
video till then take care
the 40 second tutorial in this course
and in this tutorial we'll be talking
about the local time function in Perl
and basically this is at all about date
and time values and you know how we can
retrieve the current time and displayed
in a way that is easy to understand so
as you can see I have a script opened up
here it's called date underscore time
and in this script on line number three
I have created the list variable in a
rebel called months and it has the short
forms for month names so Jan Feb March
April right up till December and then on
line number four I have created another
list variable called week and this has
the short names four days a week so I
have Sunday Monday Tuesday up till
Saturday and then on line number five I
have made a call to the local time
function over here and you call it by
just typing local time and a set of
parentheses and I have saved the output
from that function in another list
variable called my underscore date time
and then on line number six I have used
a print statement to just see the
contents of my underscore date time and
if I would run the script the way it is
right now let me press f5 so we see that
we get a string of numbers and then we
see the current time in the condit but
we haven't really gotten to that part of
the script yet so I'm not going to talk
about that output we're gonna run this
program again and check out the output
and then talk about in more detail but
for the time being you ought know that
the local time function converts you
know the time that is specified by expr
in a list context and it returns a nine
element array and you know if you have
nine element array then basically you
have subscripts from 0 till 8 and the
subscript 0 is 4 seconds you know the
one the first subscript is 4 minutes the
second subscript is four R's 3 is 4
you know day of the month the fourth is
four month fifties four year sixties day
of the week seventh is day of the earth
and eight is I don't know what the 8th
subscript is for I've forgotten but
anyway we're not gonna get to that part
so to retrieve the individual values I
have feared variables and I've stored
those values in the variables thus
created so to store the seconds I have
created a variable called seconds and as
I said the second value is stored at the
zero subscript so you make a call to the
list variable which is minus court date
time and square brackets you pass zero
so the second value would be stored in
the seconds variable
similarly minutes value would be stored
in the minutes variable and then ours
are stored at position two so minder
scored eight times square brackets two
that's going to get you the arse and
then day of the month at three the month
value is at subscript 4 and then the
year value is actually you know 1900 is
considered as a base so the ear value
that you get is you know whatever value
is there after 1900 so if you were to
see the current year then you would have
to basically add 1900 to it because
that's the base and then you know for
sure day of the week it returns a
numeric value and if you want to see you
know a value like Sunday Monday Tuesday
and so forth then you would have to
basically use an array variable like the
one that I have created here and I have
done that for months as well actually
because you know you get the value as a
numeric index and if you have an array
variable like this and you could just
use the value as a subscript for this
array and you would get the
corresponding month value and then
finally you know after creating all
these variables I am using two print
statements one on line number 15 the
other one on line number 16 I'll run the
script and this is the output that we
get this is the raw string that's
returned by
xpr and then this is the current time
1:11 and this is the current date so you
know it's Friday March 11 2016 we see
all the values that we have fetched so
that's it for this tutorial I hope you
guys had fun watching this one you may
subscribe to my channel if you haven't
already I'm gonna see you in the next
video till then take care
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Nov 22, 2024 Last updated |
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