If you need better precision, you don't go converting to/from civil time, because people think on quanta of ~1 second and better precision is not defined there.
Instead, I'll put my rule here: It's perfectly reasonable to drop your time precision to ~1 second when converting it into "people time", and you should never expect better precision from a back conversion.
That's not saying you don't need TAI. It's just not reasonable to mix it and UTC et. al. If you need TAI, you live in TAI.
Comments
If you need better precision, you don't go converting to/from civil time, because people think on quanta of ~1 second and better precision is not defined there.
Instead, I'll put my rule here: It's perfectly reasonable to drop your time precision to ~1 second when converting it into "people time", and you should never expect better precision from a back conversion.
That's not saying you don't need TAI. It's just not reasonable to mix it and UTC et. al. If you need TAI, you live in TAI.