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Time Unit Reference
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The second (s) is the SI base unit of time, defined by the frequency of cesium-133 atomic transitions. A Julian year is exactly 365.25 days (31,557,600 seconds). An average Gregorian month is approximately 30.4375 days. A fortnight (14 days = 2 weeks) is common in British English and some payroll systems.
A Unix timestamp is the number of seconds since January 1, 1970, 00:00:00 UTC (the "Unix epoch"). It's the most common way computers store dates and times. The current Unix timestamp is continuously increasing. On January 19, 2038, 32-bit systems will hit overflow (the "Year 2038 problem") at 2,147,483,647 seconds.
A Julian year is exactly 365.25 days (31,557,600 seconds). It's the average length of a year in the Julian calendar, which adds a leap day every 4 years. The actual tropical year (Earth's orbit) is 365.24219 days — 11 minutes shorter than Julian, causing the Gregorian calendar to omit century leap years (except centuries divisible by 400).