51 lines
1.4 KiB
Markdown
51 lines
1.4 KiB
Markdown
# NTPClient
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[](https://travis-ci.org/arduino-libraries/NTPClient)
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Connect to a NTP server, here is how:
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```cpp
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#include <NTPClient.h>
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// change next line to use with another board/shield
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#include <ESP8266WiFi.h>
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//#include <WiFi.h> // for WiFi shield
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//#include <WiFi101.h> // for WiFi 101 shield or MKR1000
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#include <WiFiUdp.h>
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const char *ssid = "<SSID>";
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const char *password = "<PASSWORD>";
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WiFiUDP ntpUDP;
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// By default 'pool.ntp.org' is used with 60 seconds update interval and
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// no offset
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NTPClient timeClient(ntpUDP);
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// You can specify the time server pool and the offset, (in seconds)
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// additionaly you can specify the update interval (in milliseconds).
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// NTPClient timeClient(ntpUDP, "europe.pool.ntp.org", 3600, 60000);
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void setup(){
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Serial.begin(115200);
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WiFi.begin(ssid, password);
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while ( WiFi.status() != WL_CONNECTED ) {
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delay ( 500 );
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Serial.print ( "." );
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}
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timeClient.begin();
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}
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void loop() {
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timeClient.update();
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Serial.println(timeClient.getFormattedTime());
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delay(1000);
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}
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```
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## Function documentation
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`getEpochTime` returns the unix epoch, which are the seconds elapsed since 00:00:00 UTC on 1 January 1970 (leap seconds are ignored, every day is treated as having 86400 seconds). **Attention**: If you have set a time offset this time offset will be added to your epoch timestamp.
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