jiff::civil::date

Function month_add_one

Source 
fn month_add_one(
    year: impl RInto<ri16<-9999, 9999>>,
    month: impl RInto<ri8<1, 12>>,
    sign: impl RInto<ri8<-1, 1>>,
) -> Result<(ri16<-9999, 9999>, ri8<1, 12>), Error>
Expand description

Adds or subtracts sign from the given year/month.

If month overflows in either direction, then the year returned is adjusted as appropriate.