Twitter search and earliest possible date

Can anyone familiar with the Twitter Search API tell me what the earliest possible Search date in (YYYY-MM-DD) format is?

Also, whe开发者_JAVA百科n using this date, is it necessary to omit any date limited query string parameters?

And does the order of query string parameters matter?

Due to the way Twitter stores and serves Tweets in their search API, the minimum date won't really matter. This is because only the last 1,500 results for a given search are stored and served. There's also some sort of time limit, where if you're using lesser-used search term or hash tag, Tweets will expire after 7 days.

ETA: In practice, it seems Tweets are stored/served longer than 7 days.

If I remember correctly search is limited to the previous 7 days, so it's right now - 7 days.