Input

How to Use

Enter a time value

Type "now" for current time, a Unix timestamp (e.g. 1700000000), or a date string (e.g. 2024-01-15).

Click Convert

Press the Convert button to parse your input into multiple date formats.

Read the output

See the result as Unix seconds, ISO 8601, RFC 2822, local string, and UTC string.

About Time Calculator

Time arithmetic is deceptively fiddly — durations crossing midnight, totals across multiple legs, and unit conversions all invite mistakes. ILikePdf Time Calculator computes durations between times, adds and subtracts intervals, and converts between seconds, minutes, hours, and days with correct handling of day boundaries. It is built for shift sheets, travel planning, and billing. Everything runs in your browser, instantly and offline.

How to calculate time Time Calculator

Step 1: Enter start and end times to find a duration.

Step 2: Add or subtract time intervals (hours, minutes, seconds).

Step 3: Convert between time units — seconds, minutes, hours, days.

Step 4: Review the results and copy them.

Common use cases for Time Calculator

Calculate shift lengths and time sheets.
Add travel times across multiple legs.
Convert durations between units for billing.
Plan schedules with precise intervals.
Total screen time across multiple project sessions for reporting.

Pro tips

Durations spanning midnight are handled correctly.
Unit conversion supports large values easily.
Everything runs in your browser.
Times are entered as hh:mm:ss — seconds are optional.
The result copies cleanly into spreadsheets and timesheets.
Duration math is exact — no rounding surprises for billing or planning.

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Time Calculator