Getting Date & Time From NTP Server With ESP8266 NodeMCU ----------------------------------------------------------------------------------- Email: elafe1888@gmail.com linkden: www.linkedin.com/in/elaf-a-saeed-97bbb6150 facebook: https://www.facebook.com/profile.php?id=100004305557442 twitter: https://twitter.com/ElafASaeed1 github: https://github.com/ElafAhmedSaeed youtube: https://youtube.com/channel/UCE_RiXkyqREUdLAiZcbBqSg slideshare: https://www.slideshare.net/ElafASaeed Slideplayer: https://slideplayer.com/search/?q=Elaf+A.Saeed Google Scholar: https://scholar.google.com/citations?user=VIpVZKkAAAAJ&hl=ar&gmla=AJsN-F7PIgAjWJ44Hzb18fwPqJaaUmG0XzbLdzx09

1. Internet ofThings
Getting Date & Time From NTP Server
With ESP8266 NodeMCU
Eng. Elaf A.Saeed

2. The Contents
• NTP Server With ESP8266 NodeMCU.
• Getting Day & Time From NTP Server With ESP8266 NodeMCU.
• Getting Current Day and Time from NTP Server.
• Getting Current Date and Time from NTP Server.

3. Getting Day & Time & date From NTP
Server With ESP8266 NodeMCU

4. NTP Server With ESP8266 NodeMCU

5. NTP Server With ESP8266 NodeMCU
(cont.)
• NTP stands for Network Time Protocol and it is a networking protocol for clock
synchronization between computer systems. In other words, it is used to synchronize
computer clock times in a network.
• The protocol can be used to synchronize all networked devices to Coordinated
Universal Time (UTC) within a few milliseconds ( 50 milliseconds over the public
Internet and under 5 milliseconds in a LAN environment).
• Coordinated Universal Time (UTC) is a world-wide time standard, closely related to
GMT (Greenwich Mean Time). UTC does not vary, it is the same world wide.

6. NTP Server With ESP8266 NodeMCU
(cont.)
❑NTPArchitecture
• NTP uses a hierarchical architecture. Each level in the
hierarchy is known as a stratum.
• At the very top are high-precision timekeeping devices,
such as atomic clocks, GPS or radio clocks, known as
stratum 0 hardware clocks.
• Stratum 1 servers have a direct connection to a stratum 0
hardware clock and therefore have the most accurate time.
• Each stratum in the hierarchy synchronizes to the stratum
above and act as servers for lower stratum computers.

7. NTP Server With ESP8266 NodeMCU
(cont.)
❑How NTP Works?
• NTP can operate in a number of ways. The most common configuration
is to operate in client-server mode. The basic working principle is as
follows:
1. The client device such as ESP8266 connects to the server using the
User Datagram Protocol (UDP) on port 123.
2. A client then transmits a request packet to a NTP server.
3. In response to this request the NTP server sends a time stamp packet.
4. A time stamp packet contains multiple information like UNIX
timestamp, accuracy, delay or time zone.
5. A client can then parse out current date & time values.

8. NTP Server With ESP8266 NodeMCU
(cont.)
❑Installing the NTPClient Library
• We’ll use the NTPClient library to get time. In your Arduino IDE, go to
Sketch > Library > Manage Libraries. The Library Manager should open.
• Search for NTPClient and install the library by Fabrice Weinber as shown in
the following image.

9. Getting Day & Time From NTP Server
With ESP8266 NodeMCU

10. Getting Day & Time From NTP Server
With ESP8266 NodeMCU
❑NTPClient Library Time Functions
• getDay() – returns an int number that corresponds to the the week day (0 to 6)
starting on Sunday;
• getHours() – returns an int number with the current hour (0 to 23) in 24 hour format;
• getMinutes() – returns an int number with the current minutes (0 to 59);
• getSeconds() – returns an int number with the current second;
• getEpochTime() – returns an unsigned long with the epoch time (number of seconds
that have elapsed since January 1, 1970 (midnight GMT);
• getFormattedTime() – returns a String with the time formatted like HH:MM:SS;

11. Getting Day & Time From NTP Server
With ESP8266 NodeMCU (cont.)

12. Getting Current Day and Time from
NTP Server (cont.)

13. Getting Current Day and Time from
NTP Server (cont.)

14. Getting Current Date and Time from
NTP Server
❑Function that is used in Code
1. year()➔ Set or read the RTC year value.
Syntax
year(unsigned long year)
2. month() ➔ Set or read the RTC month value.
Syntax
month(unsigned long month)
3. day() ➔ Set or read the RTC day value.
Syntax
day(unsigned long day)

15. Getting Current Date and Time from
NTP Server (cont.)
❑Function that is used in Code
4. minute() ➔ Set or read the RTC minute value.
Syntax: minute(unsigned long minute)
5. second() ➔ Set or read the RTC second value.
Syntax: second(unsigned long second) .

16. Getting Current Date and Time from
NTP Server (cont.)

17. Getting Current Date and Time from
NTP Server (cont.)

18. Getting Current Date and Time from
NTP Server (cont.)

19. Getting Current Date and Time from
NTP Server (cont.)

20. Thanks