EPOCHREALTIME to days, hours, minutes, seconds

[hancooper]

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Friday, August 20, 2021 12:29 PM, Alex fxmbsw7 Ratchev <fxmbsw7@gmail.com> 
wrote:

> and if u re looking to benchmark, you cannot use the seconds var cause one 
> second plus minus is no good benchmark
> at least for fast exact stuff
>
> On Fri, Aug 20, 2021, 14:27 Alex fxmbsw7 Ratchev <fxmbsw7@gmail.com> wrote:
>
>> EPOCHSECONDS doesnt have . dot ... EPOCHREALTIME has
>>
>> On Fri, Aug 20, 2021, 14:22 hancooper <hancooper@protonmail.com> wrote:
>>
>>> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
>>> On Friday, August 20, 2021 7:52 AM, Andreas Kusalananda Kähäri 
>>> <andreas.kahari@abc.se> wrote:
>>>
>>>> On Fri, Aug 20, 2021 at 10:04:27AM +0300, Tapani Tarvainen wrote:
>>>>
>>>> > On Thu, Aug 19, 2021 at 06:38:12PM +0000, hancooper via 
>>>> > (help-bash@gnu.org) wrote:
>>>> >
>>>> > > Is there a neat way to convert from decimal seconds (result from
>>>> > > EPOCHREALTIME) to days, hours, minutes, seconds?
>>>> >
>>>> > If you are treating it as a date (rather than a time difference),
>>>> > you can do simply
>>>> > A=$EPOCHREALTIME
>>>> > date -d @$A +'%d %H:%M:%S'
>>>> > Adjust format to taste.
>>>> > If it's a time difference but less than a year, and you want days,
>>>> > hours, minutes and seconds in variables, you can do it like this:
>>>> > eval $(date -d @$A +'days=%j hours=%H minutes=%M seconds=%S.%N')
>>>>
>>>> Quoting would be nice.
>>>>
>>>> > days=$((days-1))
>>>> > If you want to discard extra zeroes:
>>>> > seconds=${seconds%000}
>>>> > seconds=${seconds#0}
>>>> > hours=${hours#0}
>>>> > minutes=${minutes#0}
>>>>
>>>> If you're using bash but don't have other GNU tools installed, and only
>>>> want second granularity, then use printf instead:
>>>>
>>>> now=$EPOCHSECONDS
>>>> printf -v seconds '%(%S)T' "$now"
>>>> printf -v minutes '%(%M)T' "$now"
>>>> printf -v hours '%(%H)T' "$now"
>>>
>>> How can I deal with seconds that includes fractional part ?
>>>
>>> This produces error
>>>
>>> Elapsed Time bash: printf: 13.506899: invalid number
>>> bash: printf: 13.506899: invalid number
>>> bash: printf: 13.506899: invalid number
>>> bash: printf: 13.506899: invalid number
>>>
>>> now=$EPOCHSECONDS
>>> printf -v seconds '%(%S)T' "$t"

You are correct, I was referring to EPOCHREALTIME, but my rapid typing got 
EPOCHSECONDS out instead.