Expiring soon calculation assumes static quarter length

[asakusuma]

supported/lib/util.js

Line 10 in 8d93669

// 91 days in a quarter, 24hrs per day, 60 minutes per hour, 60 seconds per hour, 1000 milliseconds per sec

Not all quarters are the exact same length. Quarters with two 31 day months will be longer than quarters with one 31 day month. This results in some calculations being off by a day. Will be worse with the quarter with February.