Today is the day to file unless they file a Form 12b-25 today or tomorrow to receive the extra five days.
From the linked website:
• If a filing due date falls on a weekend or SEC holiday, the filing is due on the following business day.
• The EDGAR system hours of operation for submitting files are 6:00 a.m. to 10:00 p.m. Eastern Time, weekdays, excluding Federal Holidays. Files submitted after 5:30 p.m. Eastern (with the exception of Section 16 filings) will receive the next business day's filing date.
• Companies may request a filing extension for their Form 10-Q's and 10-K's by submitting Form 12b-25 via the EDGAR system. By filing this form, a filer may gain up to 5 additional days to file Form 10-Q or 15 days to file Form 10-K. Companies have up to 24 hours after the original filing deadline to file Form 12b-25.
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