Business & IT Date Calculator

Business & IT date/time calculator: SLA, proration, lease, and epoch tools

DeltaCalc: The Business & IT Date Calculator for Professionals

DeltaCalc helps you solve complex date and time calculations instantly. This is the essential **Business & IT Date Calculator** for professionals who need precision tools for lease terms, proration, SLA nines, and technical conversions like Epoch time.

Built around a powerful set of **date and time calculators**, DeltaCalc helps you capture photos, videos, audio, and notes with evidence-quality metadata so you can find, trust, and share what happened later. Built around Daily Tasks and Projects, it gives you a date-centered view of your life and work with timelines, transcripts, fields, and exports.


— FREE CALCULATORS —

• Between Dates/Times: Compute the exact difference between two dates/times (years, months, days, hours, minutes, seconds) with optional times and “now.”


• Epoch Converter: Convert between human-readable date/time and Unix **epoch seconds/milliseconds**, in local or UTC.


• Add/Subtract: Start from now or a custom base and add or subtract years, months, weeks, days, hours, or minutes.

• Lease Term: Break a lease or contract length into years, months, days, hours, and seconds.


• Notice Window: Compute the last safe notice date and grace-end date given a contract end date.


• Proration: Prorate a full-period billing amount over a partial usage window (days used vs. total days).


• Installments: Generate a schedule of recurring due dates from a first due date, interval, and count/end.

• TTL & Cache: Convert TTL values into precise cache-expiry times in local and UTC.


• SLA Nines: Translate **SLA uptime targets** (e.g., 99.9%) into allowed downtime per period and show breakdowns.


• Maintenance: Plan maintenance windows across local time, UTC, and selected additional zones.


• Log Timestamps: Normalize log timestamps from various formats/zones into consistent local/UTC times.

• Shifts & OT: Summarize total hours and per-day overtime from one or more shifts, using an OT threshold.


• Rounding: Apply configurable rounding rules to raw clock-in/clock‑out times (timesheet rounding).


• Sprints: Plan sprint and release dates from a project start date, sprint length, and count.


• Age & Tenure: Compute age or tenure from a start date, including workdays/weeks.