![]() When dealing with timestamps, using ecpoch time makes many things easier. This can be very important when using timestamps as the timestamps are then universal and independent of local timezone. ![]() This way the actual time/epoch remains based on UTC. If you want or need to play with Timezones to get local times then again the best way to handle that is to also use an epoch based time and use the local time offset the time only when converting & printing it in local time format. Jack's DS3231 library is meant to work hand in hand with the Time library.Ä«oth libraries are designed to work with epoch based time and can convert to a human wall clock local time if necessary. The online unix time conversion tool has feature to convert human readable time with timezone to milli-second and seconds timestamps. I know that there exists std::chrono::systemclock::fromtimet, but a timet does not have a fractional part. timepoint should only know Epoch, every clock should produce timepoints with a certain epoch. I have a fractional epoch timestamp, represented as double, that I would like to convert to an appropriate std::chrono::timepoint.The epoch is the usual UNIX epoch since. The Time library has examples for how to sync with NTP. Convert a time expressed in seconds since the epoch to a structtime in UTC in which the dst flag is always zero. Why not just have an Epoch concept in the standard library timepoint should not need to know about any clock, it shouldnt need to be aware of how more timepoints can be created. Then I'd recommend using the Time library and this DS3231/32 library: GitHub - JChristensen/DS3232RTC: Arduino Library for Maxim Integrated DS3232 and DS3231 Real-Time Clocks ![]() It is much more accurate and they are really cheap. If you need an RTC, I would ditch the DS1307 and and get a DS3231 module. That is what NTP uses and that is what libraries like Time use. Local time is very painful way to track time especially for timestamps. Therefore, if the epoch time was provided in milliseconds since 1-1-1970 from UNIX, then we want to divide by the number of milliseconds in a year and add Excels representation of 1-1-1970 to provide the human readable UTC time. The above program ports to C++20 by dropping include 'date/tz.h' and using namespace date. The master already transmits the time to all slaves once every 10 seconds in the form of 6 bytes (YMD HMS, for the year only the last 2 digits are transmitted)Äon't track time that way. Excel expresses days as whole values and times as fractional values. For C++11/14 the template parameter for zonedtime needs to be specified: zonedtime.
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