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/*** Since the unixtime that can be handled by the `Date` is in milliseconds, this method output downscaled to 1/1000.* @param date date object for any datetime, if blank output the current datetime.* @return unixtime in seconds.*/export function unixtimeEncode(date?:Date){    return Math.floor((date ?? new Date()).getTime() / 1000);}
/*** Since the unixtime that can be handled by the `Date` is in milliseconds, the argument of this method is internally multiplied by x1000.* @param time unixtime in seconds.* @return date object specified by `time`.*/export function unixtimeDecode(time:number){    return new Date(time * 1000);}
/*** Convert formatted datetime string such as ISO8601 to unixtime.* @param dt formatted datetime string.* @return unixtime in seconds.*/export function unixtimeParse(dt:string){    const [y, mo, d, h, mi, s] = dt.split(/[/ :TZ_.-]/i).map(s => Number(s));
    return unixtimeEncode(new Date(y, (mo ?? 1) - 1, d ?? 1, h ?? 0, mi ?? 0, s ?? 0));}