Converting seconds to Hours:Minutes:Seconds has been answered a number of ways for Python here.
How would one do this in Julia?
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There are sooooo many ways to do this. This [_Introducing Julia_](https://en.wikibooks.org/wiki/Introducing_Julia/Working_with_dates_and_times) WikiBook shows some nice tools for the job. – rickhg12hs Sep 17 '18 at 06:07
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See also https://discourse.julialang.org/t/how-to-convert-period-in-milisecond-to-minutes-seconds-hour-etc/2423 – carstenbauer Sep 17 '18 at 06:45
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I'm surprised how there's no built-in formatting provided for time deltas. – niczky12 Sep 17 '18 at 10:32
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@rickhg12hs Thanks for the link. – Julia Learner Sep 17 '18 at 14:09
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@crstnbr Thanks for the link. – Julia Learner Sep 17 '18 at 14:10
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@niczky12 Would crstnbr's answer below be built-in formatting for time deltas in your opinion? – Julia Learner Sep 17 '18 at 14:16
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Canonicalize is a good option, but you can't format it as far as I know. I would expect to be able to do something like: `format(my_time_delta, "h m s")` or something similar. – niczky12 Sep 18 '18 at 07:04
2 Answers
2
Method 1:
This code follows Brandon Rhodes answer in Python at the link in the original question. It answers the original question.
Advantage: Simplicity.
Disadvantage: For long simulation runs the output will not be formatted as nicely as the method given after this one.
using Printf
start = time()
sleep(65.129) # 65.129 seconds
elapsed = time() - start
(minutes, seconds) = fldmod(elapsed, 60)
(hours, minutes) = fldmod(minutes, 60)
@printf("%02d:%02d:%0.2f", hours, minutes, seconds)
"""========== The expected output is ==========
00:01:5.16
"""
Method 2:
@crstnbr solves a similar problem with the canonacalize function. I do not see it in the Julia 1.0.0 documentation, but I found it in the Julia source as linked here.
It has the neat property of gracefully handling both short and long elapsed time periods.
Advantage: Provides a useful format for long elapsed times.
Disadvantage: Does not seem to be in the current Julia 1.0.0 documentation, may be hard to remember.
julia> start = now(); sleep(1.23); elapsed = now() - start;
julia> canonicalize(Dates.CompoundPeriod(elapsed))
1 second, 246 milliseconds
julia> canonicalize(Dates.CompoundPeriod(elapsed*1000000))
2 weeks, 10 hours, 6 minutes, 40 seconds
If you are doing long simulations, that might be helpful.
Julia Learner
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Not really what you asked for, but maybe still useful:
julia> using Dates
julia> start = now(); sleep(1.23); elapsed = now() - start;
julia> canonicalize(Dates.CompoundPeriod(elapsed))
1 second, 231 milliseconds
See https://discourse.julialang.org/t/conversion-and-formatting-of-dates-timeperiod/15063.
carstenbauer
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Is using `now()` considered more "Julian" than `time()`, or is it just a matter of preference? – Julia Learner Sep 17 '18 at 14:39
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`now()` returns a `Dates.DateTime` and is only avaible after `using Dates`. `time()` returns an integer (microseconds). In that sense `time()` is more simple/low-level. – carstenbauer Sep 17 '18 at 14:43
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