Advanced Date Time Calculator is a full-featured date time calculator that contains 5 main functions:

• Calculates the result date time by adding/subtracting some years, months, weeks, days, hours, minutes and/or seconds to/from a base time, for instance: get the result time by adding 3.29 years, 1.8 weeks and 982 seconds to current time.
• Calculates the differences (years, months, weeks, days, hours, minutes, seconds and integrated difference) between two times, it is usually used to get the years/months/weeks/days/hours/minutes counts for the past/future events based on current date time, such as birth, marriage and anniversary. So, it has initialized the start and end date time as current date time for you, just change one date time to count the number of years/months/weeks/days/hours/minutes/seconds of your past/future events based on current time, for instance: you can quickly get "How many seconds/days you live".
• Counts the days of week, weekdays, weekends between two dates, e.g. easily get the days of week between Jan 29, 1819 and Oct 14, 1981.
• Gets the conversion between various date time elements (days, years, months, weeks, minutes, seconds, hours), with this tool, you can easily and quickly know the answers of some time conversion questions, such as "how many seconds in a year".
• Calculate the exact date that indicated by a large days/seconds number that passed from UNIX base date (Jan 01, 1970), or get the corresponding UNIX/Linux days/seconds number by specifying a general date, e.g. 15,551 days indicates Jul 30, 2012.

All above results are instantly shown after changed any conditions (base time, algorithm (+/-), values of date time elements, begin/end date time, UNIX days/seconds number, UNIX date), do not need to click any button such as , .

Also, it supports thousands separator and decimal in all numeric fields (years, months, weeks, days, hours, minutes, seconds, days of week, weekdays and weekends).