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DateTime+
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About
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Past
Timely Revolutions
Present
Leap Seconds
Monotonic Clocks
Financial Calendars
ISO 8601:2019
Conformance
Cardinal vs Ordinal
Future
12 x 120 Clock
12 x 122 calendar
12×60 clock and calendar
2 leaps per 8 years
24 x 61 Calendar
6 x 61 Calendar
7 x 7 x 7 Calendar
Day Zones
Duodecimal
Simpler Roman Calendars
Bi-Monthly calendar alignment
Interesting calendars
Humour
Past
History of Date & Time