Blake Matthes
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45 lines
1.1 KiB
TypeScript
45 lines
1.1 KiB
TypeScript
import { getJsDateFromExcel } from "excel-date-to-js";
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export const excelDateStuff = (
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serial: number,
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defaultTime = 800,
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time?: number,
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) => {
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if (typeof serial !== "number" || serial <= 0) {
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return "invalid Date";
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}
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// Get base date from Excel serial (this gives you UTC midnight)
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const excelTime = excelSerialToTime(serial);
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const finalTime = time ?? excelTime ?? defaultTime;
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const date = getJsDateFromExcel(Math.floor(serial));
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const localOffset = new Date().getTimezoneOffset() / 60;
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const hours = Math.floor(finalTime / 100);
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const minutes = finalTime % 100;
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// Set the time in UTC
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date.setUTCHours(hours + localOffset);
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date.setUTCMinutes(minutes);
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date.setUTCSeconds(0);
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date.setUTCMilliseconds(0);
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//console.log(date.toISOString(), serial, time);
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return date.toISOString();
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};
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const excelSerialToTime = (serial: number): number | null => {
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const fraction = serial % 1;
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if (fraction <= 0) {
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return null;
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}
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const totalMinutes = Math.round(fraction * 24 * 60);
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const hours = Math.floor(totalMinutes / 60);
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const minutes = totalMinutes % 60;
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return hours * 100 + minutes;
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};
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