Q
Problem solve Get help with specific problems with your technologies, process and projects.

# Coding for unique calendar year, part 2

What to do if the calendar starts from April 21 as the first day of the first month, and each month has 30 days? (Assuming there are only 360 (= 12 x 30) days in a year.)

Continued from part 1.

### Code for M30-Gregorian Conversion Functions

``` CREATE OR REPLACE FUNCTION from_m30 ( in_text CHAR ) RETURN DATE -- ********************* -- ** f r o m _ 3 0 ** -- ********************* -- from_m30 returns the DATE corresponding to the m30 date passed -- in in_text ('YYYY-MM-DD' format). IS greg_year_val PLS_INTEGER; m30_day_val PLS_INTEGER := TO_NUMBER ( SUBSTR (in_text, 9, 2), '99' ); m30_month_val PLS_INTEGER := TO_NUMBER ( SUBSTR (in_text, 6, 2), '99' ); m30_new_year_dt DATE; m30_year_val PLS_INTEGER := TO_NUMBER ( SUBSTR (in_text, 1, 4), '9999' ); year_offset_val PLS_INTEGER := 78; -- Gregorian year of M30 year 0 BEGIN greg_year_val := m30_year_val + year_offset_val; RETURN TO_DATE ( TRIM ( TO_CHAR ( greg_year_val, '0000' ) ) || '0420', 'YYYYMMDD' ) + (30 * (m30_month_val - 1)) + m30_day_val; END from_m30; / CREATE OR REPLACE FUNCTION to_m30 ( in_date DATE ) RETURN CHAR -- ******************* -- ** t o _ m 3 0 ** -- ******************* -- to_m30 returns a string representing an M30 date in -- 'YYYY-MM-DD' format (the same format from_m30 uses). IS m30_day_val PLS_INTEGER; m30_new_year_date DATE; m30_month_val PLS_INTEGER := 1; m30_year_val PLS_INTEGER; year_begin_text CHAR (4); year_offset_val PLS_INTEGER := 78; -- Gregorian year of M30 year 0 BEGIN m30_year_val := TO_NUMBER ( TO_CHAR ( in_date, 'YYYY' ), '9999' ) - year_offset_val; IF TO_CHAR (in_date, 'MMDD') > '0420' THEN -- New year was in same Gregorian year year_begin_text := TO_CHAR ( in_date, 'YYYY' ); ELSE -- New Year was in previous Gregorian year year_begin_text := TO_CHAR ( ADD_MONTHS (in_date, -12), 'YYYY' ); m30_year_val := m30_year_val - 1; END IF; m30_new_year_date := TO_DATE ( year_begin_text || '-04-21', 'YYYY-MM-DD' ); m30_year_val := TO_NUMBER (year_begin_text, '9999') - year_offset_val; m30_month_val := 1; -- Assumed: may be changed in loop below m30_day_val := (in_date - m30_new_year_date) + 1; WHILE m30_day_val > 30 LOOP m30_day_val := m30_day_val - 30; m30_month_val := m30_month_val + 1; END LOOP; RETURN TRIM (TO_CHAR (m30_year_val, '0000')) || '-' || TRIM (TO_CHAR (m30_month_val, '00')) || '-' || TRIM (TO_CHAR (m30_day_val, '00')); END to_m30; /
```

#### Have a question for an expert?

Get answers from a TechTarget expert on whatever's puzzling you.

You will be able to add details on the next page.

#### Start the conversation

Send me notifications when other members comment.

## SearchDataManagement

• ### Amazon cloud database and data analytics expand

AWS expands its Redshift data warehouse capabilities including managed storage and query acceleration at the re:Invent 2019 ...

• ### Vendors move away from open source database software licensing

While open source is a key to success for many database vendors, it can also potentially lead to a competitive threat from a ...

• ### Oracle looks to grow multi-model database features

Decade after decade, Oracle continues to be relevant in the database market as it pivots to include an expanding list of ...

• ### Sisense analytics platform update features AI, data prep tool

Augmented intelligence features and an in-warehouse data prep tool highlight Sisense's latest update, its second since acquiring ...

• ### Operation Fistula uses data to treat childbirth injuries

Aided by an analytics stack developed by Exasol, nonprofit Operation Fistula is working to end obstetric fistula in targeted ...

• ### Automated tools broaden the future scope of data science

Automated data science tools may make their way into the data science process, but are unlikely to ever be able to do everything ...

## SearchSAP

• ### Partners need to target SAP SMB market for cloud transition

In this Q&A, SAP executive Claus Gruenewald discusses how SAP partners are instrumental in servicing the SMB market and how they ...

• ### S/4HANA Cloud integrates Qualtrics for continuous improvement

The latest version of SAP S/4HANA Cloud embeds Qualtrics XM capabilities that provide a way for users to give direct feedback ...

• ### SAP Data Warehouse Cloud may democratize data analytics

SAP's new SAP Data Warehouse Cloud promises to make data analytics more accessible to the business. It's a needed addition to ...

## SearchSQLServer

• ### SQL Server database design best practices and tips for DBAs

Good database design is a must to meet processing needs in SQL Server systems. In a webinar, consultant Koen Verbeeck offered ...

• ### SQL Server in Azure database choices and what they offer users

SQL Server databases can be moved to the Azure cloud in several different ways. Here's what you'll get from each of the options ...

• ### Using a LEFT OUTER JOIN vs. RIGHT OUTER JOIN in SQL

In this book excerpt, you'll learn LEFT OUTER JOIN vs. RIGHT OUTER JOIN techniques and find various examples for creating SQL ...

## TheServerSide.com

• ### Public API strategy considerations for enterprise adoption

As organizations look for more cost-effective ways to manage data, an evolving landscape with APIs has made the technology more ...

• ### Ideas on how to hold a successful code hackathon

Want to host a hackathon? Here are some ideas on what a company can do to host an event that solves problems and reenergizes the ...

• ### A Jenkins tutorial for beginners with examples

If you're ready to try Jenkins, this quick start tutorial lays out the specific steps you'll need to take to download and install...

## SearchDataCenter

• ### Top 4 open source automation tools for admins

Open source offerings are an easy way to bring automation into your organization. When selecting software, evaluate the user ...

• ### U.S. facility may have best data center PUE

The data center energy efficiency metric, power usage effectiveness, or PUE, is not improving. But one supercomputer data center ...

• ### Increase efficiency with data center temperature monitoring

Data centers must track multiple temperature components. Organizations can use ASHRAE standards and on-premises hardware for ...

## SearchContentManagement

• ### New capabilities added to Alfresco Governance Services

The updates are intended to secure electronically stored information residing across different locations in light of recent ...

• ### Top 5 Office 365 skills for SharePoint administrators

Microsoft SharePoint administrators need to branch out in their Office 365 skill set to support products tightly integrating with...

• ### Box cloud content management helps simplify digital work

Box currently has three main areas of focus: integration with enterprise applications, content security and collaboration. The ...

## SearchHRSoftware

• ### IT's technology experience problem gets HR tool

Technology deployments have been blamed for loss of productivity and even employee resignations. A new tool from Qualtrics could ...

• ### 3 keys to employee engagement measurement

Far too many organizations and their HR departments conduct employee engagement measurement in a way that does more harm than ...

• ### Cornell researchers call for AI transparency in automated hiring

Researchers at Cornell University want vendors to disclose how automated hiring systems are making hiring recommendations. They ...

Close