I can't translate it into Chinese exactly, but the time being referred to is the time the month started to the present time - before the month has ended. So far in the month, the speaker has seen many old friends. There is an implied statement that this will continue for the rest of the month, but it is not certain. If the time was in the past, the sentence would be: "This turned out to be the month for seeing old friends"

没上下文吗？单这个句子不好翻译，很让人费解。