also: こんばんにちわ
interjection
good day and good evening; hello (humorous blend)
A jocular blend of こんにちは (good day) and こんばんは (good evening), used playfully when the time of day is ambiguous or as a lighthearted greeting.
夕方の微妙な時間に「こんばんにちは!」と挨拶した。
I greeted them with 'konban-nichiwa!' at that ambiguous evening hour.