Time Units

Time is a part of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change such as the motions of objects. The temporal position of events with respect to the transitory present is continually changing; future events become present, then pass further and further into the past. Time has been a major subject of religion, philosophy, and science, but defining it in a non-controversial manner applicable to all fields of study has consistently eluded the greatest scholars.

Unit	Size	Notes
Yoctosecond	10−24 second
Zeptosecond	10−21 second
Attosecond	10−18 second	shortest time now measurable
Femtosecond	10−15 second	pulse time on fastest lasers
Picosecond	10−12 second
Nanosecond	10−9 second	time for molecules to fluoresce
Microsecond	10−6 second
Millisecond	10−3 second	0.001 Second
Second	10−0 second	SI base unit
Minute	60 seconds
Hour	60 minutes
Day	24 hours
Week	7 days	Also called sennight
Fortnight	14 days	2 weeks
Lunar Month	27.2–29.5 days	Various definitions of lunar month exist.
Month	28–31 days
Quarter	3 months
Year	12 months
Common Year	365 days	52 weeks + 1 day
Leap Year	366 days	52 weeks + 2 days
Tropical Year	365.24219 days	average
Gregorian Year	365.2425 days	average
Olympiad	4 year cycle
Lustrum	5 years	Also called pentad
Decade	10 years
Indiction	15 year cycle
Generation	17–35 years	approximate
Jubilee (Biblical)	50 years
Century	100 years
Millennium	1,000 years

Exasecond (10⁺¹⁸ seconds)          

Roughly 32 billion years, more than twice the age of the universe on current estimates.

Cosmological Decade (Varies)  

1 times the length of the previous cosmological decade, with CÐ 1 beginning either 1 seconds or 1 years after the Big Bang, depending on the definition.

Standard Time Format = Hours : Minutes : Seconds (24 Hours > 00:00:00 to 23:60:59 | 12 Hours > 12:00 AM to 11:59 PM)

Standard Date Format = Day - Month -Year