My passport valid date have only 6 months 15 days...

If the passport is valid for 6 months, you do not need to renew it, but we advise you to renew it so that it does not end and you are outside the country
you can renew the passport, through going to your country embassy and apply for renewing the passport and attach the following:
1- The expired passport
2- Residence
3- ID card
4 - personal pictures according to the specifications that requested by the embassy