Date & Time Tools

Date arithmetic and timezone conversions are notoriously tricky. These tools handle the heavy lifting — calculate working days, convert timezones, find date differences, and parse ISO strings.

• Timezone ConverterConvert times between any two world timezones.
• ISO Date ConverterConvert dates to and from ISO 8601 format.
• Date DifferenceCalculate the exact difference between two dates.
• Working Days CalculatorWorking days calculator — count working (business) days between two dates online. Exclude weekends and custom holidays. Also called business days calculator or weekday counter. Free, instant, browser-based.
• Date Format Code GeneratorGenerate date formatting code in JavaScript (dayjs, moment, native), Python, Java, PHP, MySQL, PostgreSQL, SQL Server, C#, and Go from a visual format builder. Supports date arithmetic, Unix timestamps, and preset formats. Free, instant, browser-based.