![]() Received time: Saturday, 25-Aug-18 14:36:53.525 UTC (internal clock was 1 ms slow) Received time: Saturday, 25-Aug-18 14:35:53.480 UTC (internal clock was 1 ms slow) Received time: Saturday, 25-Aug-18 14:34:53.410 UTC (internal clock was 1 ms fast) (a complete sketch to show how simple it is) Have a look at some of these examples to see how easy it is to use. ![]() Various #define options let you leave parts of the library out if you want to make it smaller: you can even leave out the networking altogether if you have a different time source.Įasy to use: Don't believe it until you see it. Small enough: Works with all features and full debugging information on an old Arduino Uno with an Ethernet Shield, leaving 2/3 of RAM and even some of the flash for you to work with. Multilingual: Can display names of days and months in different languages. Prevent display-flicker with minuteChanged() and secondChanged() functions without storing any values to compare. Print things like "8:20 PM" or "Saturday the 23rd of August 2018" with ease. Time-saving: No more time spent on writing code to print date or time in some nicer way. Informative: No need to guess while you're working on something, ezTime can print messages to the serial port at your desired level of detail, telling you about the timezone's daylight savings info it receives or when it gets an NTP update and by how much your internal clock was off, for instance. Robust: It doesn't fail if the timezone api goes away: it can use cached data, which ezTime can store in EEPROM (AVR Arduinos) or NVS (e.g. But you can also set and express time referring to multiple timezones, all very easy and intuitive.Įventful: You can set events to have ezTime execute your own functions at a given time, and delete the events again if you change your mind. You can set which timezone the sketch should be in, or have it be in UTC which is the default. ezTime reads the fractional seconds and tries to account for network latency to give you precise time.īackwards compatible: Anything written for the existing Arduino time library will still work. An NTP request to only takes 40ms round-trip on home DSL these days, so adding sub-second precision to a time library makes sense. Precise: Unlike other libraries, ezTime does not throw away or mangle the fractional second information from the NTP server. (And even networking can be disabled completely if you have another source for time.) Self-contained: It only depends on other libraries to get online, but then it doesn't need other libraries for NTP and timezone data lookups. This is how ezTime - the project that was only going to take a few days - came to be. Some way in which all this work would benefit more people. Overlooking the battlefield after implementing some part of this, it seemed like there had to be a better way. Wouldn't it be nice to have some function to print formatted time like many programming languages offer? ![]() Then I wanted 12 or 24 hour time displayed, and thought about various formats for date and time. I figured I would simply get this data from the internet and parse it. But it needs the timezone's rules, like "DST goes into effect on the last Sunday in March at 02:00 local time" told to it. So I could get Jack Christensen's Timezone library. It's 2018, my clock should know about timezone rules. Then I remembered how annoyed I always am when daylight savings time comes or goes, as I have to manually set some of my clocks such as the microwave oven, the clock in the car dashboard, etc etc. And then I wanted it to show the local time, so I would need some way for the user to set an offset between UTC and local time. Then I needed to sync that to an NTP server, so I figured I would use NTPclient, one of the existing NTP client libraries. I figured I would use Time, Michael Margolis' and Paul Stoffregen's library to do time things on Arduino. The status bar of M5ez needed to display the time. I was working on M5ez, an interface library to easily make cool-looking programs for the " M5Stack" ESP32 hardware. Jump to: Table of Contents - Function Reference - dateTime function ezTime, an Arduino library for all of time *ĮzTime - pronounced "Easy Time" - is a very easy to use Arduino time and date library that provides NTP network time lookups, extensive timezone support, formatted time and date strings, user events, millisecond precision and more.
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