Time and Date
- - Create monthly and yearly calendars.
- - Add to or subtract from a date.
- - Find the first day of spring.
- - Find the first day of summer.
- - Find the shortest day of the year.
- - Find the first day of winter.
- - Find the longest day of the year.
- - Calculate when is the next leap year.
- - Check if today is Christmas.
- - Calculate day of the week for a date.
- - Find the first day of autumn (fall).
- - List all leap years between two years.
- - Calculate time duration between two dates with time.
- - Calculate the number of days between two dates.
- - Find out when is the last and next leap year.
- - Calculate day number of the year and days remaining.
- - Create day of year calendar.
- - Calculate days in month of a year.
- - Find the date of vernal equinox.
- - Find the date of autumnal equinox.
- - Find the date of winter solstice.
- - Find the date of summer solstice.
- - Convert hours, minutes and seconds time to decimal.
- - Check if a year is a leap year.
- - Convert decimal time to hours, minutes and seconds.
- - Check if today is April fool's day.
- - Calculate what day of the week you were born.
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