import { type Maybe, type MaybeNot } from '../value/maybe.type';
/**
 * This value is in seconds since the Epoch.
 *
 * Use UnixDateTimeMillisecondsNumber instead if you need milliseconds.
 */
export type UnixDateTimeSecondsNumber = number;
/**
 * This value is in seconds since the Epoch.
 *
 * Use DateOrUnixDateTimeMillisecondsNumber instead if you need milliseconds.
 */
export type DateOrUnixDateTimeSecondsNumber = Date | UnixDateTimeSecondsNumber;
/**
 * Converts a Date object or unix timestamp number to a unix timestamp number.
 *
 * @param input - Date object or unix timestamp number to convert
 * @returns Unix timestamp number if input is valid, null/undefined if input is null/undefined
 */
export declare function unixDateTimeSecondsNumberFromDateOrTimeNumber(input: Maybe<DateOrUnixDateTimeSecondsNumber>): Maybe<UnixDateTimeSecondsNumber>;
/**
 * Gets the current time as a unix timestamp number.
 *
 * @returns Current time as unix timestamp number
 */
export declare function unixDateTimeSecondsNumberForNow(): UnixDateTimeSecondsNumber;
/**
 * Converts a Date object to a unix timestamp number.
 *
 * @param date - Date object to convert
 * @returns Unix timestamp number if date is valid, null/undefined if date is null/undefined
 */
export declare function unixDateTimeSecondsNumberFromDate(date: Date): UnixDateTimeSecondsNumber;
export declare function unixDateTimeSecondsNumberFromDate(date: MaybeNot): MaybeNot;
/**
 * Converts a Date object or unix timestamp number to a Date object.
 *
 * @param input - Date object or unix timestamp number to convert
 * @returns Date object if input is valid. Returns null/undefined if input is null/undefined
 */
export declare function dateFromDateOrTimeSecondsNumber(input: DateOrUnixDateTimeSecondsNumber): Date;
export declare function dateFromDateOrTimeSecondsNumber(input: MaybeNot): MaybeNot;
export declare function dateFromDateOrTimeSecondsNumber(input: Maybe<DateOrUnixDateTimeSecondsNumber>): Maybe<Date>;
/**
 * Converts a unix timestamp number to a Date object.
 *
 * @param dateTimeNumber - Unix timestamp number to convert
 * @returns Date object if timestamp is valid, null/undefined if timestamp is null/undefined
 */
export declare function unixDateTimeSecondsNumberToDate(dateTimeNumber: Maybe<UnixDateTimeSecondsNumber>): Maybe<Date>;