How to create a date-time variable or interval

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# Project Name - How to create a date-time variable or interval

# Recipe URL - https://app.lingk.io/a/10932/tf/18342

# Description -  This recipe demonstrates how to generate a date-time value relative to the current date-time. 
               # For example, if a recipe needs a date-time that is 15 days prior to the current date-time, this can be accomplished programattically in your statement section using SQL Functions.

# Systems - 
# Connectors - JSON
# Data Flows - Single Direction
# Connection Type - Static Data

# Add Recipe notes / Change log information here!

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# CONNECTORS specify what data will be pulled into the in-memory database during processing

connectors:

# Configure JSON connector in your Environment before running this recipe
  # JSON Setup - https://help.lingk.io/en/articles/74-json-connector-reference

# This JSON contains static values that are used as the source data to be processed
# For this particular example, the dateTime field is the value required
-
    name: students
    type: json
    properties:
      jsonObject: {"students":{"id":"1","names":[{"firstName":"John","lastName":"Thomas","fullname":"John Thomas"}],"dateTime":"2019-03-15","email":"jthomas@gmail.com","credentials":[{"password":"AEIOU8901"},{"password":"pass123!"},{"password":"ABC123"}]}}

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# STATEMENTS specify how the data should be processed while in memory 
statements:

# Read the source data stored in the JSON
  - statement: (getStudent) => select * from students
  - statement: print getStudent

# Extract the data from the dateTime field using a specific format that includes timestamp
  - statement: |
      (studentDateTime) => 
        select 
               date_format(students.dateTime, "yyyy-MM-dd'T'HH:mm:ss'Z'")     student_dateTime
        from getStudent students

- statement: print studentDateTime

# This statement is commonly used when the date and timestamp given is not the value expected as the final result and needs to increase or reduce X amount of minutes, days, months, etc
  - statement: (timeInterval) => SELECT  date_format(student_dateTime - INTERVAL 30 minute, "yyyy-MM-dd'T'HH:mm:ss'Z'") `dateTime` from studentDateTime
  - statement: print timeInterval

# Add more statements to convert, join, aggregrate, transform, and integrate your data