PostgreSQL 9.6.9 Documentation
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# B.2. Date/Time Key Words

Table B-1 shows the tokens that are recognized as names of months.

Table B-1. Month Names

Month | Abbreviations
--- | ---
January | Jan
February | Feb
March | Mar
April | Apr
May |
June | Jun
July | Jul
August | Aug
September | Sep, Sept
October | Oct
November | Nov
December | Dec

Table B-2 shows the tokens that are recognized as names of days of the week.

Table B-2. Day of the Week Names

Day | Abbreviations
--- | ---
Sunday | Sun
Monday | Mon
Tuesday | Tue, Tues
Wednesday | Wed, Weds
Thursday | Thu, Thur, Thurs
Friday | Fri
Saturday | Sat

Table B-3 shows the tokens that serve various modifier purposes.

Table B-3. Date/Time Field Modifiers

Identifier | Description
--- | ---
`AM` | Time is before 12:00
`AT` | Ignored
`JULIAN`, `JD`, `J` | Next field is Julian Date
`ON` | Ignored
`PM` | Time is on or after 12:00
`T` | Next field is time

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