So I'm lucky enough to use Java 8 and the new time APi but I don't see any rounding functions...
Basically if the time is...
2014-08-28T10:01.00.000 ----> 2014-08-28T10:02.00.000 2014-08-28T10:01.10.123 ----> 2014-08-28T10:02.00.000 2014-08-28T10:01.25.123 ----> 2014-08-28T10:02.00.000 2014-08-28T10:01.49.123 ----> 2014-08-28T10:02.00.000 2014-08-28T10:01.59.999 ----> 2014-08-28T10:02.00.000
This seems to be ok, but is it right?
LocalDateTime now = LocalDateTime.now(Clock.systemUTC()); LocalDateTime newTime = now.plusMinutes(1); System.out.println(newTime.toString()); System.out.println(newTime.format(DateTimeFormatter.ofPattern("yyyy-dd-MM'T'HH:mm:00.000")));
The java.time
API does not support rounding to ceiling, however it does support rounding to floor (truncation) which enables the desired behaviour (which isn't exactly rounding to ceiling):
LocalDateTime now = LocalDateTime.now(); LocalDateTime roundFloor = now.truncatedTo(ChronoUnit.MINUTES); LocalDateTime roundCeiling = now.truncatedTo(ChronoUnit.MINUTES).plusMinutes(1);
In addition, there is a facility to obtain a clock that only ticks once a minute, which may be of interest:
Clock minuteTickingClock = Clock.tickMinutes(ZoneId.systemDefault()); LocalDateTime now = LocalDateTime.now(minuteTickingClock); LocalDateTime roundCeiling = now.plusMinutes(1);
This clock will automatically truncate minutes to floor (although it is specified such that it may return a delayed cached value). Note that a Clock
may be stored in a static variable if desired.
Finally, if this is a common operation that you want to use in multiple places, it is possible to write a library TemporalAdjuster
function to perform the rounding. (Adjusters can be written once, tested, and made available as a static variable or method).
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