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What is the 312 deadline if March 1 falls on a weekend?

Under EPCRA §312, Tier II information for any calendar year must be submitted to the State Emergency Response Commission (SERC), Local Emergency Planning Committee (LEPC), and local fire department by March 1st of the following year.  What if the March 1st reporting deadline falls on a Saturday or Sunday?

Tier II forms need to be submitted to the SERC, LEPC, and local fire department on or before March 1st even if the reporting deadline falls on a Saturday or Sunday.  In order to be considered submitted, Tier II forms must be postmarked by March 1st.