Struct DateTimeUtil 

pub struct DateTimeUtil;

日期时间工具，提供全面的日期时间操作

Implementations

impl DateTimeUtil

pub fn now() -> String

获取当前时间，格式化为 “YYYY-MM-DD HH:MM:SS.mmm”

pub fn timestamp() -> i64

获取当前时间戳（毫秒）

pub fn date() -> String

获取当前日期，格式化为 “YYYY-MM-DD”

pub fn time() -> String

获取当前时间，格式化为 “HH:MM:SS”

pub fn format_now(fmt: &str) -> String

自定义格式化当前时间

pub fn from_timestamp(timestamp: i64, fmt: &str) -> String

将时间戳转换为日期时间字符串

pub fn parse(datetime_str: &str, fmt: &str) -> Option<NaiveDateTime>

将字符串解析为 NaiveDateTime

pub fn is_same_day(dt1: &NaiveDateTime, dt2: &NaiveDateTime) -> bool

检查是否为同一天

pub fn add_days(dt: &NaiveDateTime, days: i64) -> NaiveDateTime

添加天数

pub fn add_hours(dt: &NaiveDateTime, hours: i64) -> NaiveDateTime

添加小时

pub fn add_minutes(dt: &NaiveDateTime, minutes: i64) -> NaiveDateTime

添加分钟

pub fn days_between(dt1: &NaiveDateTime, dt2: &NaiveDateTime) -> i64

计算两个日期之间的天数差

pub fn first_day_of_month(year: i32, month: u32) -> Option<NaiveDate>

获取当月第一天

pub fn last_day_of_month(year: i32, month: u32) -> Option<NaiveDate>

获取当月最后一天

pub fn is_weekday(dt: &NaiveDateTime) -> bool

检查是否为工作日（非周末）

pub fn is_weekend(dt: &NaiveDateTime) -> bool

检查是否为周末

pub fn to_utc(dt: DateTime<Local>) -> DateTime<Utc>

转换为 UTC 时间

pub fn change_timezone(dt: &DateTime<Utc>, hours: i32) -> DateTime<FixedOffset>

转换时区

pub fn get_quarter(dt: &NaiveDateTime) -> u32

获取季度

pub fn calculate_age(birth_date: &NaiveDate) -> u32

年龄计算