Use 7-Seg LED, 1602 LCD, 12864 display, LED Dot Matrix and ESP8266 NodeMCU to make a network clock
Demo: https://www.bilibili.com/video/av50338779
https://www.bilibili.com/video/BV1Cy4y177h9

Arduino Time Library: https://github.com/PaulStoffregen/Time
Arduino Timezone Library: https://github.com/JChristensen/Timezone