The main function

impl UTCDatetime{
    fn new(year:u16,month:u8,day:u8,hour:u8,minute:u8,second:u8)->Result<UTCDatetime, IllegalTimeError>;
    fn get_timestamp(&self)->Result<u32,IllegalTimeError>;
    fn day_of_the_week(&self)->u8;
    fn from_string(time_str:&str)->Result<UTCDatetime, IllegalTimeError>;
}

The UTCDatetime structure derives PartialEq and PartialOrd, you can directly use <,>, ==, <=,>=,!= for comparison.

Attention!

This library does not consider the time zone,Please convert local time to UTC time by yourself