Business Hours Calculator —
P3
/
P4
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P3
: Mon–Fri 08:00–18:00 (excl. bank holidays) — SLA:
24 business hours
P4
: Mon–Fri 08:00–18:00 (excl. bank holidays) — SLA:
70 business hours
Upload CSV file (optional)
CSV format expected (no header required):
P3,INC123456789,10/11/2025 09:00,11/11/2025 10:30
Columns: priority, incident, impact_start, impact_end
Manual entry (used when no CSV is uploaded)
Priority
P3 (24 business hours)
P4 (70 business hours)
Incident (optional)
Impact start (manual)
Impact end (manual)
Work hours are fixed to 08:00–18:00 for P3/P4.
Server hard-coded UK bank holidays (for reference)
2026
2026-01-01
— New Year's Day
2026-04-03
— Good Friday
2026-04-06
— Easter Monday
2026-05-04
— Early May bank holiday
2026-05-25
— Spring bank holiday
2026-08-31
— Summer bank holiday
2026-12-25
— Christmas Day
2026-12-26
— Boxing Day
2026-12-28
— Boxing Day (substitute observed day)
2027
2027-01-01
— New Year's Day
2027-03-26
— Good Friday
2027-03-29
— Easter Monday
2027-05-03
— Early May bank holiday
2027-05-31
— Spring bank holiday
2027-08-30
— Summer bank holiday
2027-12-25
— Christmas Day
2027-12-26
— Boxing Day
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