noun
Tuesday
A1
Dienstag (der) means Tuesday. Main translation: 'Tuesday'. Gender masculine (der). Singular genitive often des Dienstags (-s ending), plural can be Dienstage. Used capitalized as a noun. Note: when talking about recurring days, German often uses singular with article or adverbs, but plural Dienstage exists for multiple Tuesdays.
Examples
Am Dienstag reiste das Team zur Konferenz, obwohl am Morgen starker Regen fiel.
On Tuesday the team traveled to the conference, although heavy rain fell in the morning.
Am Dienstag habe ich einen wichtigen Termin.
On Tuesday I have an important appointment.
Am Dienstag habe ich einen Termin beim Arzt.
I have an appointment with the doctor on Tuesday.
Details
Mnemonics
Picture a calendar with the letter 'D' on the second weekday box.
Sounds like 'dense tag' — imagine a dense (busy) day: Tuesday.
der — think 'der Day' (both start with D) to remember masculine.
Notes
Weekdays are masculine in German when used as nouns (der Dienstag). In colloquial speech you may also hear 'dienstags' to mean 'on Tuesdays' (every Tuesday).