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Time Calculator. You can add or subtract two time values with this calculator. If you are looking to add or subtract some time from a date, please use the date calculator. Please provide the values in the fields above the =.Then click the Calculate button to calculate.When entering, you can leave some fields blank. These fields will be taken as 0 by default.f you are looking to add or subtract some time from a date, please use the date calculator. Please provide the values in the fields above the =. Then click the Calculate button to calculate. When entering, you can leave some fields blank. These fields will be taken as 0 by default.
[ Skip to Calculator ]. The online Date Time Calculator on this page will quickly add or subtract spans of time to or from a date of your choosing! This free online date calculator will subtract or add days, weeks, months, years, hours, minutes, and seconds from or to the date and time you select.Note that if you would like to find the number of days between two dates, or the number of days left until a certain date, please visit the Date Difference Calculator.ext, select the optional starting time (hours, minutes, seconds) and then select Add or Subtract for the date math you would like performed. Finally, enter the number of date and time units you would like added or subtracted from the starting date, then click the Calculate Date and Time button.