What is week?
A week is a unit of time equal to 7 days. It is the standard cycle for work schedules, recurring events, sports seasons, and planning in most cultures worldwide.
Real-world uses
Weeks structure work schedules, school timetables, pregnancy tracking (40 weeks), and agile software development sprints. Pay periods are often weekly or biweekly, and epidemiologists report disease incidence in weekly intervals.
History
The seven-day week has ancient origins, adopted by the Babylonians and later by the Romans, who named days after celestial bodies. It became entrenched in Western culture through the Jewish Sabbath tradition and was formalized in the Roman calendar.
Common mistakes
Assuming a month is exactly 4 weeks—most months are 4 weeks plus 2 or 3 days. Also, different cultures start the week on different days (Sunday in the US, Monday in ISO 8601 and most of Europe).
What is century (100 yr)?
A century is a unit of time equal to 100 years. It is used in historical analysis, long-term demographic and climate projections, and describing spans of civilizational or geological time.
Real-world uses
Centuries are used in historical periodization (e.g., "the 19th century"), long-term climate modelling, geological timeframes, and demographic trend analysis. Architectural preservation classifies buildings by the century of their construction.
History
The word "century" comes from the Latin "centuria," meaning a group of one hundred, used by the Romans for military units of approximately 100 soldiers. Its application to 100-year periods became common in European historical writing.
Common mistakes
The most common error is off-by-one: the 21st century began on January 1, 2001, not 2000, because there was no year zero. Also, confusing centuries with millennia (1,000 years) in historical discussions.
When is this conversion used?
Converting week to century (100 yr) is useful in the time domain when comparing values across different measurement standards or applying formulas that require a specific unit.
Worked examples
1 week = 0.00019178 century (100 yr)
1 century (100 yr) = 3.153600e+09 second
How to convert week to century (100 yr)
To convert week to century (100 yr), multiply the value by 0.00019178.
To convert century (100 yr) back to week, multiply by 5,214.28571429.
Measurement standards
The SI second is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the caesium-133 atom, maintained by the BIPM and national metrology institutes worldwide.
Did you know?
Earth's rotation is gradually slowing due to tidal friction with the Moon. To keep atomic time aligned with solar time, "leap seconds" have been inserted 27 times since 1972 — though they are scheduled to be abolished by 2035.
Quick reference: week to century (100 yr)
| week | century (100 yr) |
|---|---|
| 0.1 | 0.00001918 |
| 0.5 | 0.00009589 |
| 1 | 0.00019178 |
| 2 | 0.00038356 |
| 5 | 0.0009589 |
| 10 | 0.00191781 |
| 25 | 0.00479452 |
| 50 | 0.00958904 |
| 100 | 0.01917808 |
| 250 | 0.04794521 |
| 500 | 0.09589041 |
| 1,000 | 0.19178082 |
Common values
| week | century (100 yr) | |
|---|---|---|
| Blink of an eye | 4.960317e-07 week | 9.512938e-11 century (100 yr) |
| Average pop song | 0.00034722 week | 6.659056e-08 century (100 yr) |
| Feature film | 0.01190476 week | 0.00000228 century (100 yr) |
| One work day (8 hrs) | 0.04761905 week | 0.00000913 century (100 yr) |
| One calendar year | 52.14285714 week | 0.01 century (100 yr) |
Available Time units
More week conversions
- Convert week to second
- Convert week to minute
- Convert week to hour
- Convert week to day
- Convert week to year (365 d)
- Convert week to millisecond
- Convert week to microsecond
- Convert week to nanosecond
- Convert week to century (100 yr)
Assumption: year is defined as 365 days and century values are approximate.