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  2. Equation of time - Wikipedia

    en.wikipedia.org/wiki/Equation_of_time

    Here M D is the value of M at the chosen date and time. For the values given here, in radians, M D is that measured for the actual Sun at the epoch, 1 January 2000 at 12 noon UT1, and D is the number of days past that epoch. At periapsis M = 2π, so solving gives D = D p = 2.508 109.

  3. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    If the result is 7, 8, or 9, then subtract 7. If, instead, the result is negative, then add 7. If the result is still negative, then add 7 one more time. Utilizing this approach, we can avoid the worries of language specific differences in mod 7 evaluations. This also may enhance a mental math technique.

  4. Fan chart (time series) - Wikipedia

    en.wikipedia.org/wiki/Fan_chart_(time_series)

    In time series analysis, a fan chart is a chart that joins a simple line chart for observed past data, by showing ranges for possible values of future data together with a line showing a central estimate or most likely value for the future outcomes. As predictions become increasingly uncertain the further into the future one goes, these ...

  5. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    A time interval is the intervening time between two time points. The amount of intervening time is expressed by a duration (as described in the previous section). The two time points (start and end) are expressed by either a combined date and time representation or just a date representation. There are four ways to express a time interval:

  6. C date and time functions - Wikipedia

    en.wikipedia.org/wiki/C_date_and_time_functions

    computes the difference in seconds between two time_t values time: returns the current time of the system as a time_t value, number of seconds, (which is usually time since an epoch, typically the Unix epoch). The value of the epoch is operating system dependent; 1900 and 1970 are often used. See RFC 868. clock

  7. Talk:ISO week date - Wikipedia

    en.wikipedia.org/wiki/Talk:ISO_week_date

    Having seen the rubbishy code of two major software suppliers, and noting that the recent products of one have code which is not only bloated but wrong, I think that adding something on Algorithms would be justified. To convert a Gregorian date into an ISO 8601 Week Numbering date Y W D, all that is necessary is to :-

  8. Date and time notation - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation

    Date and time notation around the world varies.. An approach to harmonize the different notations is the ISO 8601 standard.. Since the Internet is a main enabler of communication between people with different date notation backgrounds, and software is used to facilitate the communication, RFC standards and a W3C tips and discussion paper were published.

  9. UTC offset - Wikipedia

    en.wikipedia.org/wiki/UTC_offset

    So if the time being described is two hours ahead of UTC (such as in Kigali, Rwanda [approximately 30° E]), the UTC offset would be "+02:00", "+0200", or simply "+02". By convention, every inhabited place in the world has a UTC offset that is a multiple of 15 minutes but the majority of offsets are stated in whole hours.