Function component_of 

pub fn component_of(ms: i64, which: u8) -> i64

Extract one calendar component from epoch milliseconds, using Chrono’s field order: 0 year, 1 month, 2 day, 3 hour, 4 minute, 5 second, 6 millisecond, 7 microsecond, 8 nanosecond.

Returns 0 for unknown component indices.