Number of months between two dates, based on 30 days calendar day or not?

Why are you concerned about months vs dates, what context are the time frames relevant? If you are talking about whether a 3-year bar applies...

H1B to F1 visa

You may still get approved for a change of status (COS) to F-1 if you apply soon. Normally a person has to be in status for CIS to approve a COS....

What is required to be submitted for temporary working at additional out of state place of work ?

The answer depends on whether you are considered a 'roving" worker or not. The requirements are too complicated for a quick answer here, so the...

Can I apply for a green card, my status is H4B and my wife is H1B?

if you meet all other requirements for permanent residence (PR) and have a basis for filing (employer or family relationship usually) then you can...

L1A to L2 without leaving USA?

if your wife is eligible for L-1A status, her employer can file a change of status (COS) to L-1A for her and a COS to L-2 for you at the same time....

Could someone working on a h1b visa in a job related to his field of study also work part time as a real estate agent?

Probably not. The second employer would need to have H-1B status approved also (it is possible to have 2 H-1Bs at the same time) but it is unlikely...

Is it possible to have a h1b visa from a F1 visa without having an opt?

Yes. There is no requirement to be on OPT when applying to change to H-1B status. www.martinvisalaw.com

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My mom received a green card in april. the 6 months rule is on a calendar year or starting when the green card arrived ?

I don't recommend that your mother stay outside the US for over 6 consecutive months without getting a reentry permit. It doesn't matter in what...

If a person's visa has expired can the still get an extention

There is a difference between "visa" and "status" (see link below) and it depends on which ahs expired. if the visa has expired but the status has...

How many additional opportunities to apply for H1B from Apr. to Sept. if it is denied?

The employer can reapply for your H-1B if it feels that it can overcome the reasons for the denial. If it was denied because there are no H-1B...