From 今晩は, “as for this evening,” with the rest of the greeting omitted. The final は is pronounced wa.
From 今晩は, “as for this evening,” with the rest of the greeting omitted. The final は is pronounced wa.
When do you say こんばんは?
When meeting someone in the evening, especially after it gets dark.
Is it the same as good night?
No. おやすみなさい is said when going to bed or parting for the night.
Why does it end in は?
The final は is a topic particle left from a longer greeting, pronounced wa.
Can you use it with strangers?
Yes, it is a normal greeting when meeting someone in the evening.
Is こんばんわ standard?
No. The standard spelling is こんばんは.