Začíname už za

Synchronizácia času

Created by Miroslav Biňas / mirek

## What's the Time?

## RTC > A real-time clock (RTC) is a computer clock (most often in the form of an integrated circuit) that keeps track of the current time. > ([Wikipedia](https://en.wikipedia.org/wiki/Real-time_clock))

[](https://www.alza.sk/asus-prime-h310m-r-r2-0-d5535927.htm)


 * notes: * https://en.wikipedia.org/wiki/ESP32

## Time Epoch Unix port uses standard for POSIX systems epoch of `1970-01-01 00:00:00 UTC`. However, embedded ports use epoch of `2000-01-01 00:00:00 UTC`.

## Notable Epoch Dates | epoch | usages | | ---------- | ------------------------------------------------ | | 0.jan.1 BC | MATLAB | | 0.jan.1900 | MS Excel, IBM Lotus Notes 1, 2, 3 | | 6.jan.1980 | GPS | | 1.jan.2000 | microcontrollers, *PostgreSQL*, *ZigBee UTCTime* |

## [`utime`](http://docs.micropython.org/en/latest/library/utime.html) > The time module provides functions for getting the current time and date, measuring time intervals, and for delays.

## [`gmtime([secs])`](https://docs.micropython.org/en/latest/library/time.html#time.gmtime) * in module `time`/`utime` * convert the time `secs` expressed in seconds since the *Epoch* into an 8-tuple * if `secs` is not provided or `None`, then the current time from the RTC is used

## [`time([secs])`](https://docs.micropython.org/en/latest/library/time.html#time.time) * in module `time`/`utime` * returns the number of seconds, as an integer, since the *Epoch*

## NTP > The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. > ([Wikipedia](https://en.wikipedia.org/wiki/Network_Time_Protocol))


## [chrony](https://chrony.tuxfamily.org)

## [www.ntppool.org](https://www.ntppool.org)

## `ntptime`

## UTC Coordinated Universal Time

 notes: * https://www.space.fm/astronomy/earthmoonsun/primemeridian.html

[](https://www.rmg.co.uk/royal-observatory/attractions/stand-on-prime-meridian-line)



## Named Time Zones | short | name | UTC | | ----- | --------------------- | ------ | | CET | Central European Time | +01:00 | | PST | Pacific Standard Time | -08:00 | | MSK | Moscow Standard Time | +03:00 |

## Fun Facts

## Timezones Support in MicroPython?

[](https://imgs.xkcd.com/comics/iso_8601.png)

`2022-03-20T12:34:56Z`

`2022-03-20T12:34:56+01:00`

## Questions?