Online Time Calculator

Calculate date intervals and time differences, with support for adding and subtracting time, calculating workdays, and batch processing.

Bug report

Browser execution mode: Your data is processed in your browser and is not uploaded to the server.

Speed and Stability: Processing speed depends on your device and browser. For large batch work, the desktop version may be more stable.

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If the online tool fails to load or run, try the desktop tool.https://tools.yikeaigc.com/

Instructions

Software Usage Instructions

Select a calculation mode: Choose date interval, time addition/subtraction, countdown, time zone conversion, age calculation, or batch calculation as needed.
Set parameters: First enter the date, time, time zone, or batch data, then click the corresponding calculation button to process.
Date interval: Enter the start time and end time. You can choose to include the end date, count workdays, and enter custom dates to exclude.
Time addition/subtraction and date projection: After setting a base time, enter the increase or decrease values for years, months, weeks, days, hours, minutes, and seconds; you can also use common date projection functions.
Countdown and age: For countdowns, you can set an event name, repeat cycle, and milestones; age calculation can output age in full years, nominal age, days elapsed, and next birthday.
Time zone conversion: Select the source time zone and target time zone, and the tool will output times in multiple locations, UTC offsets, and timestamps.
Batch calculation: Enter one set of data per line. The interface previews the first 20 entries, while copy and CSV download include all results.
Save and reuse: Click “Save Settings” to keep commonly used options, and click calculation history to refill parameters.

FAQ

A: When both the start and end times are whole dates, selecting this option counts the end date in the total number of days; if specific hours, minutes, and seconds are entered, the calculation is based on the actual time difference.

A: By default, workdays are counted from Monday to Friday, excluding Saturday and Sunday. You can also enter additional dates to exclude in the custom excluded dates field.

A: Yes. Positive numbers calculate forward, while negative numbers calculate backward. For example, entering -3 for months calculates the date three months ago.

A: Formats such as YYYY-MM-DD, YYYY/MM/DD, YYYY年M月D日, and YYYYMMDD are supported, as well as additional HH:MM or HH:MM:SS times.

A: The interface only previews the first 20 entries to avoid making the page too long; copied results and downloaded CSV files will include all successfully calculated data.

A: Yes. Time zone conversion is based on the system's built-in time zone rules and will display the corresponding UTC offset according to the selected date.