api: add options for controlling precision #114
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This PR introduces new options for controlling the precision
of fractional seconds when printing `Zoned`, `Timestamp`,
`civil::DateTime` or `civil::Time` values. This is principally exposed
via `jiff::fmt::temporal::DateTimePrinter::precision`, but it's also
available via the standard library's formatting machinery. For example,
if `zdt` is a `jiff::Zoned`, then `format!("{zdt:.6}")` will format
it into a string with microsecond precision, even if its fractional
component is zero.
This is useful when one wants a datetime to use a "fixed width" format.
Or at least, as close to one as possible. For `Zoned` in particular, a
fixed width format is somewhat difficult to accomplish because of the
variable length IANA time zone identifier. But if the time zone
identifier is the same for all `Zoned` values in a particular context,
then setting the precision will provide fixed width. (Unless the years
are negative.)
Closes #92
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This PR introduces new options for controlling the precision
of fractional seconds when printing
Zoned,Timestamp,civil::DateTimeorcivil::Timevalues. This is principally exposedvia
jiff::fmt::temporal::DateTimePrinter::precision, but it's alsoavailable via the standard library's formatting machinery. For example,
if
zdtis ajiff::Zoned, thenformat!("{zdt:.6}")will formatit into a string with microsecond precision, even if its fractional
component is zero.
This is useful when one wants a datetime to use a "fixed width" format.
Or at least, as close to one as possible. For
Zonedin particular, afixed width format is somewhat difficult to accomplish because of the
variable length IANA time zone identifier. But if the time zone
identifier is the same for all
Zonedvalues in a particular context,then setting the precision will provide fixed width. (Unless the years
are negative.)
Closes #92