The Ides of march

The definition is:

# Kalends (1st day of the month)
# Nones (the 7th day in March, May, July, and October; the 5th in the other months)
# Ides (the 15th day in March, May, July, and October; the 13th in the other months)

so, Be aware of kalends of March!!

March 1: Kalends;
March 2: VI Nones;
March 3: V Nones;
March 4: IV Nones;
March 5: III Nones;
March 6: Pridie Nones (Latin for "on the day before");
March 7: Nones;
March 15: Ides