Fortnight

Imperial (British)Traditional unit (still used in some regions)

Fourteen days; short for 'fourteen nights'. Common in British English.

1 fortnight = 1,209,600 seconds (exactly).

1 fortnight = 1,209,600 seconds

About the fortnight

English inherited fortnight from Old English feowertyne niht, fourteen nights, a reminder that early Germanic peoples reckoned time by nights rather than days. It means exactly two weeks, or 14 days, which is 1,209,600 seconds. Many languages lack a single word for the span, so speakers say two weeks or fourteen days instead.

Other languages tend to count inclusively, as in Welsh pythefnos, meaning fifteen nights, matching wythnos for a week, or Spanish quincena and French quinzaine, which all point to fifteen. The Hindu calendar uses paksa for a half of a lunar month. In astronomy a lunar fortnight is half a synodic month, about 14.77 days, which is slightly longer than the calendar fortnight. Neighbouring units are the week, at half a fortnight, and the month, which holds roughly two of them.

Sources: Wikipedia: Fortnight

Fortnight conversion chart

1 fortnight expressed in every other time unit:

Unit1 fortnight
Seconds1,209,600
Minutes20,160
Hours336
Days14
Weeks2
Months0.4599683772
Years0.0383306981
Milliseconds1,209,600,000
Microseconds1,209,600,000,000
Nanoseconds1.2096×10¹⁵
Decades0.00383306981
Centuries0.000383306981
Millennia0.0000383306981
Picoseconds1.2096×10¹⁸
Common Years0.03835616438
Leap Years0.03825136612
Julian Years0.03832991102
Tropical Years0.03833073063
Sidereal Years0.03832924329
Synodic Months0.4740846695
Sidereal Days14.03833074
Aeons3.83306981×10⁻¹¹
Shakes120,960,000,000,000
Score0.001916534905
Lustra0.00766613962
Olympiads0.009582674524
Indictions0.002555379873
Jubilees0.000766613962
Ghati840
Muhurtas420
Prahar112
Shichen168
Moments13,440
Ship's Watches84
Kin (Maya)14
Winals0.7
Tun (Maya)0.03888888889
Katuns0.001944444444
Baktuns0.00009722222222

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