Milliseconds to Seconds
Compare a fixed elapsed interval in practical time units. Choose a supported direction before entering the interval. A day is a fixed elapsed day here; calendar scheduling can differ. Milliseconds are available only as milliseconds to seconds, so reversing that direction is unavailable.
Scope and assumptions
Elapsed scalar duration only. Minute=60s, hour=3600s, day=86400s, week=604800s; ms=0.001s where its existing explicit direction exists. No calendar dates, months, years, daylight-saving or leap-second inference. Available milliseconds conversion is ms→s only. Seconds→milliseconds and milliseconds with minutes/hours/days/weeks are unavailable. Show these limitations before amount entry; do not imply a reverse or complete six-unit matrix.
Only the directions listed below are supported. Switching units retains your entered amount and validates it against the new direction.
Unavailable directions: s→ms, ms→min, min→ms, ms→h, h→ms, ms→days, days→ms, ms→weeks, weeks→ms.
Seconds = Milliseconds × (1/1000).
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Worked example
For example, 1 ms is 0.001 s. Choose the units your own measurement uses.