Time zone, timestamp, and format converters. Browse our free conversion tools below — all calculators are instant, accurate, and require no sign-up.
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.
Daylight Saving Time Checker — Check DST rules by region and year. See when clocks spring forward and fall back, plus the current UTC offset for any Daylight Saving Time period.
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 time instantly.
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 instant 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.