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Local Date Time leaving = Local Date Time.of(2013, Month.
Since noon is neither before noon nor after noon, a designation of either a.m. It is fair to say, however, that the shortest measurable duration after noon should be designated as p.m. To illustrate this, consider that "a.m." and "p.m." are abbreviations for "ante meridiem" and "post meridiem," which mean "before noon" and "after noon," respectively. Also, midnight is both twelve hours before noon and twelve hours after noon.Hours of operation for a business or other references to a block of time should also follow this designation rule. When someone refers to "midnight tonight" or "midnight last night" the reference of time is obvious.For example, a business might be open on Saturdays from 8 a.m. However, if a date/time is referred to as "at midnight on Friday, October 20th" the intention could be either midnight the beginning of the day or midnight at the end of the day.To avoid ambiguity, specification of an event as occurring on a particular day at p.m. is a good idea, especially legal documents such as contracts and insurance policies.
Nautical twilight is the period when the Sun is between 12° and 6° below the horizon, and civil twilight is the period when the Sun is between 6° below the horizon until sunrise.