invalid date: wrong diff calculation for some units

[JuliaMV]

Describe the bug
create a dayjs value from null and compare it with current dayjs value:

const currentDate = dayjs();
const expiresOn = dayjs(null);

Check difference for available units:

const diffDays = expiresOn.diff(currentDate, "days");  // NaN
const diffInWeeks = expiresOn.diff(currentDate, "week"); // NaN
const diffMonths = expiresOn.diff(currentDate, "month"); // 0
const diffInQuaters = expiresOn.diff(currentDate, "quarter");  // 0
const diffInYears = expiresOn.diff(currentDate, "year");  // 0
const diffInHours = expiresOn.diff(currentDate, "hour");  // NaN
const diffInMinutes = expiresOn.diff(currentDate, "minute");  // NaN
const diffInSeconds = expiresOn.diff(currentDate, "second");  // NaN

Expected behavior
return value should be NaN for all units

Information

• Day.js Version: 1.11,13
• OS: any
• Browser: any
• Time zone: any