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I want to know if there is a way to convert java.time.OffsetDateTime to Milliseconds, I found this way, but I don't know if it is the best one:
book.getInteractionDuration().getStartTimeStamp().toEpochSecond()*1000
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OffsetDateTime is an immutable representation of a date-time with an offset. This class stores all date and time fields, to a precision of nanoseconds, as well as the offset from UTC/Greenwich. For example, the value "2nd October 2007 at 13:45.30. 123456789 +02:00" can be stored in an OffsetDateTime .
A simple solution is to get the timedelta object by finding the difference of the given datetime with Epoch time, i.e., midnight 1 January 1970. To obtain time in milliseconds, you can use the timedelta. total_seconds() * 1000 .
Converting Date to OffsetDateTimeDate date = new Date(); OffsetDateTime offsetDateTime = date. toInstant() . atOffset(ZoneOffset. UTC);
I would just convert the OffsetDateTime to an Instant and then use toEpochMilli:
long millis = book.getInteractionDuration().getStartTimeStamp().toInstant().toEpochMilli();
Unlike toEpochSecond(), this approach won't lose any more precision than is inherent in wanting milliseconds rather than nanoseconds.
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