Getting date and time from ntp server with esp8266 node mcu

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

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.

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

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.

(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.

(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.

(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.

Getting Day & Time From NTP Server

❑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;

With ESP8266 NodeMCU (cont.)

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

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)

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) .

NTP Server (cont.)

Getting date and time from ntp server with esp8266 node mcu

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