Time Tools – Small Tools. Big Help.
Welcome to SmallToolsOnline.com — your go-to toolkit for working with time, dates, and clocks quickly and efficiently. Our collection of smart browser-based time tools helps you convert, calculate, track, and format time instantly — all without installing any software or sending your data anywhere.
From simple timestamp converters and timezone calculators to advanced date difference finders, stopwatches, and countdown timers, every tool runs directly in your browser using fast JavaScript processing.
Whether you're a developer working with timestamps, a student learning time math, or a planner managing schedules — Small Tools Online helps you do it faster, smarter, and safer.
All Time Tools
Convert a clock time (HH:MM:SS) into total seconds.
Convert a number of seconds into clock time format.
Turn 24-hour formatted times into 12-hour format with AM/PM.
Turn 12-hour formatted times (AM/PM) into 24-hour format.
Calculate how many seconds have passed since midnight today.
Calculate how many seconds remain until midnight.
Find the difference between two clock times or timer values.
Calculate the average of a list of clock times or timer values.
Sort a list of clock or timer values ascending/descending.
Generate ascending or descending sequences of times with custom intervals.
Create a list of random clock/timer values in a given range.
List years with 355 days in a given range.
Render a customizable analog clock image for any time.
Render a customizable digital clock showing specified time.
Generate an image of a monthly calendar for any month/year.
Add a time interval to a clock value.
Subtract a time interval from a clock value.
Check if a clock time string is valid (HH:MM:SS, AM/PM etc.).
Round a clock time to nearest hour/minute/second.
Chop off smaller units of time (seconds/minutes) from a clock time.
Increase a given time by a certain number of seconds.
Decrease a time by a certain number of seconds.
Convert Unix timestamp into readable date and time format.
Turn a date/time value into a Unix timestamp.
Display the current Unix time in seconds and milliseconds.
Convert milliseconds into hours, minutes, and seconds.
Create a simple countdown timer directly in your browser.
Use a browser-based stopwatch to measure elapsed time.
Convert a time from one timezone to another instantly.
Display all world timezones with their UTC offsets.
Display the current Coordinated Universal Time (UTC).
Display the current time in your local timezone.
Find the weekday name for a given date.
Find which week number of the year a date belongs to.
Find the day count of a given date within the year.
List all leap years in a selected range of years.
Convert any date to ISO 8601 standard format.
Format a date into a custom date/time string pattern.
Add a number of days to any specific date.
Remove a number of days from a date to find the previous date.
Add a specified number of months to any date.
Subtract months from a date to find an earlier month.
Advance any date by a given number of years.
Go back a number of years from a given date.
Calculate the number of days between two dates.
Find the total number of full weeks between two dates.
Find how many months separate two calendar dates.
Compute the difference in years between two dates.
Determine age in years, months, and days from a birth date.
Convert time difference in milliseconds into a readable duration.