Learn Farsi: روزگار شما خجسته باد!

bâd is the historical optative form (expressing a wish or hope) of the verb budan (to be). It literally translates to "may it be" and is invariant, meaning it does not change to take personal endings like standard verbs. Today, you will mostly encounter it in fixed blessings, poetic phrases, or formal wishes like this one.

Why use ruzgâr instead of the plural of ruz (days) to say "your days"?

While ruz means a literal day, ruzgâr is a broader concept meaning "times," "era," or someone's overall fortune and circumstances in life. Translating it as "your days" in English captures the poetic intent of wishing someone a good life or a blessed period of time rather than just a sequence of 24-hour periods.

Is khojaste a common word for "happy" in everyday conversational Farsi?

No, khojaste is quite formal and literary, meaning "auspicious" or "blessed." In everyday casual speech, you would hear words like khosh or shâd, but khojaste perfectly matches the elevated, poetic tone required when using the classical verb form bâd.

Where does the Ezafe fall in this sentence?

It links the noun to its possessor right at the beginning: ruzgâr-e shomâ (your times / your days). Even in a formal or poetic sentence like this, the Ezafe remains unwritten but essential for pronunciation.