Function strptime

host/time/src/main/fmt.js:43–66

(s, fmt)

// Compile the format into a regex, capture fields, assemble a struct_time JSON.
const STRP = { Y: "(\\d{4})", y: "(\\d{2})", m: "(\\d{1,2})", d: "(\\d{1,2})", H: "(\\d{1,2})", M: "(\\d{1,2})", S: "(\\d{1,2})", j: "(\\d{1,3})", b: "([A-Za-z]+)", B: "([A-Za-z]+)", a: "([A-Za-z]+)", A: "([A-Za-z]+)" };
const strptime = (s, fmt) => {
    const fields = [];
    const src = fmt.replace(/[.*+?^${}()|[\]\\]/g, "\\$&").replace(/%(.)/g, (_, c) => {
        if (c === "%") return "%";
        if (!(c in STRP)) return "%" + c;
        fields.push(c);
        return STRP[c];
    });
    const m = new RegExp("^" + src + "$").exec(s);
    if (!m) throw new Error(`time data '${s}' does not match format '${fmt}'`);
    let Y = 1900, mo = 1, d = 1, H = 0, Mi = 0, S = 0;
    fields.forEach((f, i) => {
        const v = m[i + 1];
        if (f === "Y") Y = +v;
        else if (f === "y") Y = 2000 + +v;
        else if (f === "m") mo = +v;
        else if (f === "d") d = +v;
        else if (f === "H") H = +v;
        else if (f === "M") Mi = +v;
        else if (f === "S") S = +v;
        else if (f === "b" || f === "B") mo = monthIndex(v) + 1;
    });
    return toTuple(new Date(Date.UTC(Y, mo - 1, d, H, Mi, S)), true);
};

export default () => ({
    gmtime: (secs) => toTuple(new Date((secs ?? Date.now() / 1000) * 1000), true),