4713 bc

Astronomy has a type of consecutive days of Confucianism (JD), which begins with the GMT noon of January 1, 4713 BC on 0th. There is also a simplified Confucianism Day (MJD): MJD = JD-2400000.5 MJD's 0th day started from GMT on November 17, 1858 AD.

Recently imported data in PostgreSQL, encountering time problems, combing the time in the database:1. Basic Concepts1.1 Date: That is the commonly said year, month, and day, the following is a list of valid date formats: Example

Welcome to the Oracle community forum and interact with 2 million technical staff to enter 1rowcreated. SQLselect * fromtest_zone; TIMESTAMP_DTZONE_DTLOCAL_ZONE_DT Login --------------------------------------------------------------------------------

Unsolved. In the study   Solution: Data Type problems: Table 8-4. Character Type Name Description Character varying (N), Varchar (N) Variable Length with length restrictions Character (N), Char (N) Fixed Length, insufficient fill blank Text Variable

The data type specifies what type of data to store in the table field. When you create a table, you must use the data type for each column.There are three main types of data types in Potgresql. In addition, users can CREATE TYPE create their own

Julian Date DefinitionJulian Date: The valid date range is from January 1, 4713 BC to December 31, 9999. Julian Date is the number of days elapsed since 12 o'clock noon January 1, 4713.Using it Julian date allows us to calculate how many days

1. nsuserdefaults I personally think the IOS method is a bit similarProperties. settings. Default in C #, Nsuserdefaults only supports: nsstring, nsnumber, nsdate, nsarray, nsdictionary. There are multiple methods for creating a user ults, which is

Meaning of time strings in NSDateFormatter, nsdateformatter A: AM/PM (morning/afternoon) A: 0 ~ 86399999 (the second microsecond Of A day) C/cc: 1 ~ 7 (the first day of the week, the day of the week is 1) Ccc: Sun/Mon/Tue/Wed/Thu/Fri/Sat

NSDateFormatter date format, nsdateformatter Statement of metadata: G: AD   An example of the year: Yy: two digits behind the year Yyyy: indicates the complete year.  

My life, my little drops. #pragma mark.NSDate Creation (example class method only, instance method)Returns the current time (gmt,0 time Zone, GMT)+ (ID) date;Returns based on the current time and then secs seconds+ (ID)