import type { IActivityContext, IActivityHandler } from "../../IActivityHandler";
/** Defines inputs to the Format Date activity. */
export interface FormatDateInputs {
    date: string | number;
    format?: "LT" | "LTS" | "L" | "l" | "LL" | "ll" | "LLL" | "lll" | "LLLL" | "llll" | string;
}
/** Defines outputs to the Format Date activity. */
export interface FormatDateOutputs {
    /** @description The date formatted as per the `format` input. The current device (or browser) locale is used. */
    formatted: string;
    /** @description The date formatted in the ISO8601 standard. Example: `2013-02-04T22:44:30.652Z`. */
    iso: string;
    /** @description The date formatted as a standard english string in the local time zone. Example: `Mon Feb 04 2013 14:44:30 GMT-0800`. */
    local: string;
    /** @description The number of milliseconds since the Unix Epoch. Example: `1360017870652`. */
    unix: number;
    /** @description The date formatted as a standard english string using the UTC time zone. Example: `Mon, 04 Feb 2013 22:44:30 GMT`. */
    utc: string;
}
export declare class FormatDate implements IActivityHandler {
    static readonly action = "gcx:wf:core::FormatDate";
    static readonly suite = "gcx:wf:builtin";
    execute(inputs: FormatDateInputs, context: IActivityContext): FormatDateOutputs;
    private getFormattedDate;
    /**
     * This method inspects a multi-character Custom date and time format string.
     * These are all described on this page:
     *
     * https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings
     *
     * We use the `CUSTOM_FORMAT_CHARS` namespace to describe the supported characters.
     *
     * @param customFormatString The format string to be inspected.
     * @param locale The locale to be used for localized characters, like separators.
     * @returns Details about how to format a date from the specified format string.
     */
    private inspectCustomFormat;
    /**
     * This method inspects a single-character Custom date and time format string which is assumed to be
     * a Standard date and time format string. These are all described on this page:
     *
     * https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-date-and-time-format-strings
     *
     * We use the `STANDARD_FORMAT_STRINGS` namespace to describe each of the supported options.
     *
     * @param formatString A standard date and time format string
     * @param locale The current locale.
     * @returns Details to be used to format the date and time.
     */
    private inspectStandardFormatString;
    private renderCustom;
    /**
     * This is used for a subset of the standard date and time format strings
     * which do not relate to an explicit custom equivalent.
     * With these constraints in mind, we can make some assumptions to simplify the code.
     *   1. The "abbreviated month" is never present.
     *   2. The "abbreviated day" is never present.
     *   3. The "full day" is never present.
     * @param dateTimeFormatParts The results of formatting a test date (2000-05-01 14:00:00) to parts.
     * @returns Our own details of the parts, for formatting the date from the activity inputs.
     */
    private toCustomDateFormatParts;
}