Compare date according to client's timezone

[junjiah]

Currently when checking whether a tracking catalog is done for that day, timestamp is converted as Heroku's timezone (UTC). Needs to take client time zone into consideration.

now := time.Now()
y1, m1, d1 := now.Date()
y2, m2, d2 := markedAt.Date()
if y1 == y2 && m1 == m2 && d1 == d2 {
    // Already finished for today.
    catalog.Done = true
    catalog.Value = value
}