Here are few SFDC link, which I have found to be useful.

Salesforce Developers

Home, Developer Documentation, Force.com SOQL and SOSL Reference

• https://developer.salesforce.com/docs/atlas.en-us.soql_sosl.meta/soql_sosl/sforce_api_calls_soql_select_date_functions.htm

IBM Knowledge Center

InfoSphere Information Server, InfoSphere Information Server 11.5.0, Connecting to data sources, Enterprise applications, IBM InfoSphere Information Server Pack for Salesforce.com

• https://www.ibm.com/support/knowledgecenter/en/SSZJPZ_11.5.0/com.ibm.swg.im.iis.ds.entpak.salesf.doc/topics/SalesforcePackOverview.html

Salesforce Developers

Home, Technical Library, Workbench

• https://developer.salesforce.com/page/Workbench

Salesforce Developers

Home, Technical Library, Force.com Tools and Toolkits

• https://developer.salesforce.com/page/Tools

Related References

• What does CRM Mean?
• SFDC – Using a date literal in a where clause
• SFDC Salesforce Connector – Column Returns Null values, when SOQL Returns Data in Workbench