Picoseconds to Days (ps to d)
1 picosecond equals 1.157407407×10⁻¹⁷ days (rounded).
How to convert picoseconds to days
To convert picoseconds to days, multiply the number of picoseconds by 1.157407407×10⁻¹⁷. The factor is rounded to 10 significant digits. To go the other way, multiply days by 8.64×10¹⁶.
days = picoseconds × 1.157407407×10⁻¹⁷
Example: 10 picoseconds = 1.157407407×10⁻¹⁶ days.
Months and years are not constant. This site uses the average Gregorian year of 365.2425 days, so one 'year' converts to 365.2425 days, not 365; use 'common year' for exactly 365 days.
About these units
Picosecond (ps)
One trillionth of a second. Used for very fast electronics.
Pico comes from SI prefix naming and stands for 10 to the power of minus 12, so a picosecond is one trillionth of a second. The BIPM and NIST prefix tables both list it with the symbol p, and the unit is written ps. It is an exact decimal fraction with no historical variation, which is why the factor used here carries no uncertainty.
Picoseconds matter where signals and molecules move too fast for milliseconds or nanoseconds to be useful. Light in a vacuum travels about 0.30 mm in one picosecond, so a millimetre takes roughly 3.3 ps. A 1 THz electromagnetic wave has a cycle time of 1.0 ps, the unit interval of a 10 Gbit/s serial link is 100 ps, and a 3.0 GHz processor cycle lasts about 330 ps. Streak cameras can resolve events on single-digit picosecond timescales, and Wikipedia lists the lifetime of a hydronium ion in water as about 1 ps. A picosecond is one thousandth of a nanosecond.
1 picosecond = 1×10⁻¹² seconds (exactly).
Sources: Wikipedia: Picosecond; BIPM: SI prefixes; NIST: Metric (SI) prefixes
Day (d)
24 hours or 86,400 seconds. The mean solar day; the actual rotation of the Earth is about 4 minutes shorter (see sidereal day).
Old English dæg is the root of our day, with close cousins in German Tag, Dutch dag and Icelandic dagur, all descending from Proto-Germanic dagaz. It is the oldest unit here, because the cycle of light and dark needs no instrument. Yet the day we count is a constructed average: the actual interval from one noon to the next varies through the year by up to about 7.9 seconds, because Earth's orbit is elliptical and its axis is tilted.
Astronomers smooth this out with a fictitious mean Sun, giving the mean solar day, and the day in the SI sense is fixed at exactly 86,400 seconds. Reality has drifted slightly: the mean solar day has recently averaged about 86,400.002 seconds, and tidal drag from the Moon is lengthening it by about 2 milliseconds per century. That is why 27 leap seconds were added to UTC between 1972 and 2022. One rotation measured against the distant stars is shorter, about 23 hours 56 minutes 4.09 seconds, and a year contains one more of these sidereal days than solar days.
1 day = 86,400 seconds (exactly).
Sources: Wikipedia: Day; BIPM: SI Brochure, 9th edition
Related conversions
- Days to picoseconds (reverse)
- Picoseconds to seconds
- Picoseconds to minutes
- Picoseconds to hours
- Picoseconds to weeks
- Picoseconds to months
- Picoseconds to years
- Seconds to days
- Minutes to days
- Hours to days
- Weeks to days
- Months to days
- Years to days
- Milliseconds to days
- Microseconds to days
- Nanoseconds to days
- Decades to days
- Centuries to days
- Millennia to days
See all time units.