आज है (Aaj hai)
Pronunciation:
* Aaj (pronounced like "ahj")
* hai (pronounced like "hy")
You can then follow this with the specific day or event you're referring to. For example:
* आज सोमवार है। (Aaj somvaar hai.) - Today is Monday.
* आज मेरा जन्मदिन है। (Aaj mera janm din hai.) - Today is my birthday.