'Convert milliseconds to Time without losing precision

Time.current gives me precision beyond seconds:

> Time.current
Fri, 11 Feb 2022 23:00:18.253185000 UTC +00:00
> Time.current.to_f
1644620430.942064

But Time.at loses the precision :(

> Time.at(1644620430.942064).utc
2022-02-11 23:00:30 UTC

The whole .942064 got truncated. This is messing with some tests that compare dates, because timestamps seem to save with the milliseconds, but I don't know how to create a Time that includes milliseconds

How can I cast a variable of milliseconds into a Time?

ruby-on-railsruby


Solution 1:[1]

I think you're just seeing a formatting problem. Consider:

Time.at(1644620430.942064).strftime('%Y-%m-%dT%H:%M:%S.%N')
# 2022-02-11T15:00:30.942064046

However, if you call to_s:

Time.at(1644620430.942064).to_s
# "2022-02-11 15:00:30 -0800" 
Time.at(1644620430.942064).utc.to_s
# "2022-02-11 23:00:30 UTC"

you only get results with one second resolution.

The full precision time is there but you need to be careful to ask for it when you format your time.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 mu is too short

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