Daylight Saving Time Checker
Check DST rules by region and year. See when clocks spring forward and fall back, plus the UTC offset used during each daylight saving period.
Free Conversion Calculators
7 toolsTime zone, timestamp, and format converters. Browse our free conversion tools below — no sign-up required.
Download Time Calculator
Estimate how long a file download will take based on file size and connection speed. Supports all common file size and speed units.
ISO 8601 Date Formatter
Format any date and time as an ISO 8601 string. Enter year, month, day, hour, minute, second and get the properly formatted ISO date string.
Time Zone Converter
Convert time between any two time zones using UTC offsets. Enter a time and source/target UTC offsets to see the equivalent local time.
Timezone Offset Calculator
Calculate the time difference between two UTC offsets. Enter two timezone offsets and find the hour and minute difference between them.
Unix Epoch Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Enter a timestamp or date components to get bidirectional conversion.
World Clock Meeting Time Finder
Find the best meeting time across multiple time zones. Enter UTC offsets and business hours to discover overlapping availability windows.