Date and time formulas are useful for managing features that are time or date dependent. Two data types are used for working with dates and time in MobiDB: these are** Date** and **Time** types. You can use operations like addition or subtraction on **Date** and **Time **values to calculate either a future date or elapsed time between two dates.

The date value acquired from the**Date** type field holds only date as such, but during the calculation, if you add a **Time** type value to a **Date** type value it is possible to get a combined **Date/Time** value.

The following properties are available when working with**Date** type:

**day **– returns the day of the month of a given date (21.01.2015 12:01 -> 21)

**month** – returns the month of given date (21.01.2015 12:01 -> 1)

**year **– returns the year of a given date (21.01.2015 12:01 -> 2015)

**date** – returns the date, that does not have a time shift (21.01.2015 12:01 -> 21.01.2015)

**time** – returns the time shift from 0:00 date (21.01.2015 12:01 -> 12:01)

The values of** Date **type do not have any methods.

The available operations include:

addition to time – results in a date, shifted forward for a given time

subtraction of time from date – results in a date, shifted backward for a given time

subtraction of date from date – results in a time, elapsed from the subtracted date

The following comparison operators are supported: <, >, <=, >=

**Time** type in general is represented by a time interval. When getting the time value from the **Time** type field the value can fall within 00:00:00 to 23:59:59, but during the expression calculation the result may be more than one day.

The following properties are available when working with** Time** type:

**days** – returns a number of days in a given time interval (1d 12:02:15 -> 1)

**hours** – returns a number of hours in a given time interval (1d 12:02:15 -> 12)

**minutes **– returns a number of minutes in a given time interval (1d 12:02:15 -> 2)

**seconds** – returns a number of seconds in a given time interval (1d 12:02:15 -> 15)

**totalhours **– returns a total number of hours of a given time interval (1d 12:01:15 -> 36)

**totalminutes** – returns a total number of minutes of a given time interval (1d 12:01:15 -> 2161)

**totalseconds** – returns a total number of seconds of a given time interval (1d 12:01:15 -> 129675)

The values of the**Time** type do not have any methods.

The available operations for**Time** type include:

unary -, addition to another time interval, subtraction from time interval.

**Task. To calculate worktime hours by subtracting date and time values.**

In this scenario we originally have the following fields in our database:

**Start date** (‘date1’ field) of Date type

**Start time **(‘time1’ field) of Time type

**End date** (‘date2’ field) of Date type

**End time** (‘time2’ field) of Time type

To calculate working hours (subtract**Start date** **and time** from **End date and time**) the following approach can be used:

1.Use** days **property to get the number of days and multiply the result by 24 to get the number of hours

2.Subtract**Start time** from **End time** and use **hours **property to get the number of hours

3.Add the results from step 1 and 2 to get the total working hours value

**(date2-date1).days*24+(time2-time1).hours**

The date value acquired from the

The following properties are available when working with

The values of

The available operations include:

addition to time – results in a date, shifted forward for a given time

subtraction of time from date – results in a date, shifted backward for a given time

subtraction of date from date – results in a time, elapsed from the subtracted date

The following comparison operators are supported: <, >, <=, >=

The following properties are available when working with

The values of the

The available operations for

unary -, addition to another time interval, subtraction from time interval.

Let’s have a look at the sample for better perception.

In this scenario we originally have the following fields in our database:

To calculate working hours (subtract

1.Use

2.Subtract

3.Add the results from step 1 and 2 to get the total working hours value

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