Let’s Encrypt is a free to use tool that allows creation, management and auto-renewal of SSL certificates for web applications, services or any other apps where secure data transportation is needed.
However, there are few things that should be kept in mind when you are considering using Let’s Encrypt certificates as compared to any other traditional SSL Certificate through a Certificate Authority (CA) like Comodo.
The certificate has a validity of 90 days only at a time and it may be even less in future.
No easy installation wizard is available for it.
Let’s Encrypt needs a certificate management agent for operating on the same server that will handle requests related to that domain.
How to set up Let’s Encrypt certificate on a Windows server?
1. To begin with, you require a Let’s Encrypt client that speaks the Automated Certificate Management Environment (ACME) protocol. Let’s Encrypt client will utilize it for interacting with any CA supporting the ACME Protocol. ACME protocol is based upon JSON over HTTPS.
Therefore, firstly you need to download Windows ACME Client. I used Version 1.9.6 compiled zip.
Extract it on the server in a directory where it can reside permanently.
2. Next, you can deploy an SSL Certificate for your IIS web server. After downloading and extracting the Windows ACME Client to a directory, you need to run exe with administrative rights.
You will need to provide an email address so that the renewals can be taken care of.
Press Enter Key.
It will show Menu options. Select ‘N’ and Press Enter key.
Choose menu option: 1 for Single binding of IIS site and Press Enter key.
Select Website ID where you want to Install SSL certificate and Press Enter key.
Choose verification method and Press Enter key.
Next, you will have to accept the Terms and Conditions. Type ‘y’ and enter.
Now you will be asked to choose which binding you want to generate the SSL for:
Some countries, including the UZ, Ubekistan, and Australia, use the 12-hour clock format including am and pm. What do these abbreviations mean? Is midnight am or pm?
The 12-hour system divides the 24 hours of a day into two periods lasting 12 hours each. The first 12-hour period is designated as am. It runs from midnight to noon. The second period, marked pm, covers the 12 hours from noon to midnight.
The abbreviations am and pm derive from Latin:
AM = Ante meridiem: Before noon
PM = Post meridiem: After noon
Using numbers from 1 to 12, followed by am or pm, the 12-hour clock system identifies all 24 hours of the day. For example, 5 am is early in the morning, and 5 pm is late in the afternoon; 1 am is one hour after midnight, while 11 pm is one hour before midnight.
Ante meridiem is commonly denoted as AM, am, a.m., or A.M.; post meridiem is usually abbreviated PM, pm, p.m., or P.M. Like many other sources, timeanddate.com uses am and pm, but the other variants are equally correct and widely used.
The main weakness of the 12-hour system is a widespread confusion about which abbreviation should be used for noon and midnight: neither moment can logically be identified as before noon (am) or after noon (pm). For example, the moment of midnight occurs precisely 12 hours after noon on the previous day and 12 hours before noon on the following day.
However, most digital clocks and most sources, including timeanddate.com, designate midnight as 12 am and noon as 12 pm. Although the precise moment of noon falls in neither category, the hour succeeding it, from 12:00:01 to 12:59:59, is clearly after noon.
To avoid any confusion when referring to the precise moment of noon or midnight, we recommend using the designations 12 noon and 12 midnight instead.
Midnight Confusion
Another source of confusion is the lack of a date designator in the 12-hour system, making it impossible to logically identify a correct moment in time when only a date and 12:00 am (midnight) is provided.
Imagine being asked to pick up a friend at the airport at 12:00 am on April 13. Would you go there at midnight between April 12 and April 13? Or 24 hours later?
One way to overcome this problem is to sacrifice accuracy for clarity. Your friend could ask you to be at the airport at 12:01 am on April 13 or, if the following midnight is meant, at 11:59 pm on April 13. Alternatively, the 24-hour format could be used. Here, 0:00 refers to midnight at the beginning of the day while 24:00 is midnight at the end of the day.
Time Formats
12-hour
24-hour
12:00 (midnight)
0:00 (beginning of the day)
12:01 am
0:01
1:00 am
1:00
2:00 am
2:00
3:00 am
3:00
4:00 am
4:00
5:00 am
5:00
6:00 am
6:00
7:00 am
7:00
8:00 am
8:00
9:00 am
9:00
10:00 am
10:00
11:00 am
11:00
12:00 (Noon)
12:00
12:01 pm
12:01
1:00 pm
13:00
2:00 pm
14:00
3:00 pm
15:00
4:00 pm
16:00
5:00 pm
17:00
6:00 pm
18:00
7:00 pm
19:00
8:00 pm
20:00
9:00 pm
21:00
10:00 pm
22:00
11:00 pm
23:00
12:00 pm
24:00 (end of the day)
Converting 12-Hour to 24-Hour Format
A 24-hour clock, sometimes referred to as military time, states the time according to the number of hours that have passed since midnight. Starting at midnight, hours are numbered from 0 to 24, removing the need for designations like am and pm. For example, at 23:00, 23 hours have passed since the beginning of the current day.
To convert am or pm time to the 24-hour format, use these rules:
From midnight to 12:59 am, subtract 12 hours. 12:49 am = 0:49 (12:49 – 12)
From 1 am to noon, do nothing. 11:49 am = 11:49
From 12:01 pm to 12:59 pm, do nothing. 12:49 pm = 12:49
From 1:00 pm to midnight, add 12 hours. 1:49 pm = 13:49 (1:49 + 12)
Here's how to convert time on a 24-hour clock to the 12-hour system:
From 0:00 (midnight) to 0:59, add 12 hours and use am. 0:49 = 12:49 am (0:49 + 12)
From 1:00 to 11:59, just add am after the time. 11:49 = 11:49 am
From 12:00 to 12:59, just add pm after the time. 12:49 = 12:49 pm
From 13:00 to 0:00, subtract 12 hours and use pm. 13:49 = 1:49 pm (13:49 - 12)
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