"Hello, what are you doing today?"
or
"Hello, what are you going to do today?"
"Und was machst du heute noch?" means "And what are you doing today?"
"Hallo, wie haben seit du?" is an ungrammatical sentence without any discernable meaning. Hallo - Hello wie - how haben - to have (infinitive) seit - since du - you
To say it ackwardly:Formal: Haben Sie Pläne diesen Abend?Informal: Hast du Pläne diesen Abend?But 'plan' in that case is a formal 'plan'. To mean 'Are you doing anything tonight'Formal: Was machen Sie heute Abend?informal: Was machst du heute Abend?
If you mean "heute" (German) this means either "now" or "today"
"Today is Tuesday" is the translation for Heute ist Dienstag
If you meant "heute", the meaning is "today"
heute geb' ich alles = today I give all
Du machst mich so glücklich. Ich liebe dich. -> You make me so happy. I love you.
Hey, what's up?
"Today is Thursday". Hope that helped.
Today is a good day.
There is too little information in the question to attempt a sensible translation. Schvn is not a German word.