How to Calculate Duration in Hours Using Google Data Studio

Question

I\'m trying to get the duration in hours using data stored in Google sheets using the following fields and display the data in Google Data Studio.

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Answer 1

0) Summary

The below looks at 2 questions:

1. Updated Question (DATETIME_DIFF): Find the difference between the two time fields, NewStartTime and NewEndTime and also incorporate a Date field;
2. Original Question (TIME_DIFF): Looks for the difference between 2 Time fields, StatTime and EndTime.

1) Update (17 Sep 2020 Dates & Time Update)

Updated the Answer with the solution using the Updated Date Time Functions which incorporates the PARSE_DATETIME and DATETIME_DIFF functions:

1.1) Upgrade the Date Field

Upgrade the Date field to the newer Date field type and ensure that the NewStartTime and NewEndTime fields are set to Text.

Added a GIF to elaborate:

1.2) DATETIME_DIFF

Copy-paste the Calculated Field below to create a value in seconds that shows the difference between the two fields:

DATETIME_DIFF(PARSE_DATETIME("%Y/%m/%d%I:%M:%S %p",CONCAT(Date,NewEndTime)), PARSE_DATETIME("%Y/%m/%d%I:%M:%S %p",CONCAT(Date,NewStartTime)), SECOND)

1.3) Type (DATETIME_DIFF)

Number > Duration (Sec.)

Added a New Page to the Report and a GIF to demonstrate:

2) Original Post

It can be achieved using the 3 steps below:

2.1) Type (HH:MM Fields)

By default, the fields should be detected as Text fields, if not ensure that they are set to Text fields at the Data Source, such that it looks like:

2.2) Time_DIFF

Copy-paste the Calculated Field below to create a value in seconds that shows the difference between the two fields:

((CAST(REGEXP_EXTRACT(EndTime,"^(\\d+):")AS NUMBER)*60*60) + (CAST(REGEXP_EXTRACT(EndTime,"^\\d+:(\\d+)")AS NUMBER)*60) + NARY_MAX(CAST(REGEXP_REPLACE(EndTime,".*(PM)$","43200")AS NUMBER),0)) -
((CAST(REGEXP_EXTRACT(StatTime,"^(\\d+):")AS NUMBER)*60*60) + (CAST(REGEXP_EXTRACT(StatTime,"^\\d+:(\\d+)")AS NUMBER)*60) + NARY_MAX(CAST(REGEXP_REPLACE(StatTime,".*(PM)$","43200")AS NUMBER),0))

2.3) Type (Time_DIFF)

Numeric > Duration (Sec.)

Google Data Studio Report and a GIF to elaborate: