## Calendar

- Create monthly and yearly calendars.## Date Calculator

- Add to or subtract from a date.## First Day of Spring

- Find the first day of spring.## First Day of Summer

- Find the first day of summer.## Shortest Day of the Year

- Find the shortest day of the year.## First Day of Winter

- Find the first day of winter.## Longest Day of the Year

- Find the longest day of the year.## Next Leap Year

- Calculate when is the next leap year.## Is it Christmas?

- Check if today is Christmas.## Day of the Week Calculator

- Calculate day of the week for a date.## First Day of Autumn

- Find the first day of autumn (fall).## Leap Years List

- List all leap years between two years.## Time Between Two Dates

- Calculate time duration between two dates with time.## Days Between Two Dates

- Calculate the number of days between two dates.## When is Leap Year?

- Find out when is the last and next leap year.## Day of the Year Calculator

- Calculate day number of the year and days remaining.## Day of Year Calendar

- Create day of year calendar.## Days in Month

- Calculate days in month of a year.## Vernal Equinox Day

- Find the date of vernal equinox.## Autumnal Equinox Day

- Find the date of autumnal equinox.## Winter Solstice Day

- Find the date of winter solstice.## Summer Solstice Day

- Find the date of summer solstice.## Time to Decimal Converter

- Convert hours, minutes and seconds time to decimal.## Is it Leap Year?

- Check if a year is a leap year.## Decimal to Time Converter

- Convert decimal time to hours, minutes and seconds.## Is it April Fool's Day?

- Check if today is April fool's day.## Birth Day of the Week Calculator

- Calculate what day of the week you were born.

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