59 lines
1.9 KiB
TypeScript
59 lines
1.9 KiB
TypeScript
import { ReadonlyDate } from "readonly-date";
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const rfc3339Matcher = /^(\d{4})-(\d{2})-(\d{2})[T ](\d{2}):(\d{2}):(\d{2})(\.\d{1,9})?((?:[+-]\d{2}:\d{2})|Z)$/;
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function padded(integer: number, length = 2): string {
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const filled = "00000" + integer.toString();
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return filled.substring(filled.length - length);
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}
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export function fromRfc3339(str: string): ReadonlyDate {
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const matches = rfc3339Matcher.exec(str);
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if (!matches) {
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throw new Error("Date string is not in RFC3339 format");
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}
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const year = +matches[1];
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const month = +matches[2];
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const day = +matches[3];
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const hour = +matches[4];
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const minute = +matches[5];
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const second = +matches[6];
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// fractional seconds match either undefined or a string like ".1", ".123456789"
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const milliSeconds = matches[7] ? Math.floor(+matches[7] * 1000) : 0;
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let tzOffsetSign: number;
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let tzOffsetHours: number;
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let tzOffsetMinutes: number;
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// if timezone is undefined, it must be Z or nothing (otherwise the group would have captured).
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if (matches[8] === "Z") {
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tzOffsetSign = 1;
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tzOffsetHours = 0;
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tzOffsetMinutes = 0;
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} else {
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tzOffsetSign = matches[8].substring(0, 1) === "-" ? -1 : 1;
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tzOffsetHours = +matches[8].substring(1, 3);
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tzOffsetMinutes = +matches[8].substring(4, 6);
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}
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const tzOffset = tzOffsetSign * (tzOffsetHours * 60 + tzOffsetMinutes) * 60; // seconds
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return new ReadonlyDate(
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ReadonlyDate.UTC(year, month - 1, day, hour, minute, second, milliSeconds) - tzOffset * 1000,
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);
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}
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export function toRfc3339(date: Date | ReadonlyDate): string {
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const year = date.getUTCFullYear();
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const month = padded(date.getUTCMonth() + 1);
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const day = padded(date.getUTCDate());
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const hour = padded(date.getUTCHours());
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const minute = padded(date.getUTCMinutes());
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const second = padded(date.getUTCSeconds());
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const ms = padded(date.getUTCMilliseconds(), 3);
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return `${year}-${month}-${day}T${hour}:${minute}:${second}.${ms}Z`;
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}
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