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PrismKit

Alarm Clock

Local

Set browser alarms for a date and time, chosen weekdays or a cron schedule in any time zone, with sound and notifications while the page is open.

Calendar Converter

Convert a date between the Gregorian, Islamic, Hebrew, Persian, Chinese and other calendars, Julian Day, Unix time and Excel serial numbers.

Tip Calculator

Work out the tip and total on a bill, and split it evenly between any number of people.