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CalcHive

Date & Time

Convert timestamps, calculate date differences, parse cron expressions, and more.

8 free tools available

Date and time operations are a notoriously tricky part of software development. Time zones, daylight saving transitions, Unix timestamps, and format differences between systems can all lead to subtle bugs. Our free date and time tools help you convert timestamps, calculate date differences, format dates, and work with time zones accurately and effortlessly.

Developers, database administrators, and system engineers frequently need to convert between Unix timestamps and human-readable dates, compare dates across time zones, or parse date strings from API responses and log files. These tools provide instant, accurate results right in your browser. Stop guessing and start computing. Convert a Unix epoch to a readable date, find the exact duration between two timestamps, or explore how the same moment appears in different time zones around the world.

Unix Timestamp Converter
Popular
Convert Unix timestamps to dates
Date Difference Calculator
Calculate the difference between two dates
Age Calculator
Calculate exact age from birthdate
Cron Expression Parser
Popular
Parse cron expressions to plain English
Crontab Generator
New
Build cron expressions with a visual UI
Timezone Converter
Convert times between timezones
ISO Date Formatter
Format and parse ISO 8601 dates
Hours Calculator
Popular
Calculate hours between times

Frequently Asked Questions

What is a Unix timestamp?▾
A Unix timestamp (also called Epoch time or POSIX time) represents the number of seconds that have elapsed since January 1, 1970, at 00:00:00 UTC. It is a widely used standard in programming for storing and transmitting date/time values because it is timezone-independent and easy to work with mathematically. For example, the timestamp 1700000000 corresponds to November 14, 2023.
How do time zones affect date and time calculations?▾
Time zones determine the local offset from Coordinated Universal Time (UTC). When converting between timestamps and human-readable dates, the time zone determines which local date and time are displayed. Our tools let you specify the time zone for conversions, and many default to your browser's local time zone for convenience. Always store timestamps in UTC and convert to local time only for display purposes.
What date formats are supported by these tools?▾
Our date and time tools support a variety of commonly used formats including ISO 8601 (2024-01-15T10:30:00Z), Unix timestamps (seconds and milliseconds), RFC 2822, and human-readable formats. You can convert between these formats freely, making it easy to work with dates from different systems and APIs.
Can I calculate the difference between two dates?▾
Yes. Our date difference calculator lets you find the exact duration between any two dates and times. Results are shown in multiple units including years, months, days, hours, minutes, and seconds. This is useful for calculating project durations, time elapsed since an event, age computations, and deadline tracking.
Why do developers prefer Unix timestamps over formatted dates?▾
Unix timestamps are preferred in many programming contexts because they are timezone-neutral, easy to compare and sort numerically, compact to store, and avoid the ambiguity of different date format conventions (such as MM/DD/YYYY vs. DD/MM/YYYY). They also simplify date arithmetic since you can add or subtract seconds directly.