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What is Date-time functions in Apache Pig ?
- Date-time functions are used to transform the values and convert them into date and time values.
- Date-time functions are used in the load script and in the chart expressions.
- Date -time functions which are done based on a date-time serial number which equals the number of days used in Date-time functions.
- The Date-time functions are a group of functions which is done for implementing date and time manipulation operations.
- We can use the date-time functions to perform various operations on dates and times in the Apache pig.
- The table which is given below is the syntax, functions and the description of Date-time Functions which is done in Apache pig
| S.No. | Syntax | Functions & Description |
|---|---|---|
| 1 | ToDate(milliseconds) | ToDate(milliseconds)
This function returns a date-time object according to the given parameters. The other alternative for this function are ToDate(iosstring), ToDate(userstring, format), ToDate(userstring, format, timezone) |
| 2 | CurrentTime() | CurrentTime() returns the date-time object of the current time |
| 3 | GetDay(datetime) | GetDay(datetime)
Returns the day of a month from the date-time object. |
| 4 | GetHour(datetime) | GetHour(datetime)
Returns the hour of a day from the date-time object. |
| 5 | GetMilliSecond(datetime) | GetMilliSecond
(datetime) Returns the millisecond of a second from the date-time object. |
| 6 | GetMinute(datetime) | GetMinute(datetime)
Returns the minute of an hour from the date-time object. |
| 7 | GetMonth(datetime) | GetMonth(datetime)
Returns the month of a year from the date-time object. |
| 8 | GetSecond(datetime) | GetSecond(datetime)
Returns the second of a minute from the date-time object. |
| 9 | GetWeek(datetime) | GetWeek(datetime)
Returns the week of a year from the date-time object. |
| 10 | GetWeekYear(datetime) | GetYear(datetime)
Returns the week year from the date-time object. |
| 11 | GetYear(datetime) | GetYear(datetime)
Returns the year from the date-time object. |
| 12 | AddDuration(datetime, duration) | AddDuration(datetime, duration)
Returns the result of a date-time object along with the duration object. |
| 13 | SubtractDuration(datetime, duration) | SubtractDuration(datetime, duration)
Subtracts the Duration object from the Date-Time object and returns the result. |
| 14 | DaysBetween(datetime1, datetime2) | DaysBetween(datetime1, datetime2)
Returns the number of days between the two date-time objects. |
| 15 | HoursBetween(datetime1, datetime2) | HoursBetween(datetime1, datetime2)
Returns the number of hours between two date-time objects. |
| 16 | MilliSecondsBetween(datetime1, datetime2) | MilliSecondsBetween(datetime1, datetime2) Returns the number of milliseconds between two date-time objects. |
| 17 | MinutesBetween(datetime1, datetime2) | MinutesBetween(datetime1, datetime2)
Returns the number of minutes between two date-time objects. |
| 18 | MonthsBetween(datetime1, datetime2) | MonthsBetween(datetime1, datetime2) |
| 19 | SecondsBetween(datetime1, datetime2) | SecondsBetween(datetime1, datetime2)
Returns the number of seconds between two date-time objects. |
| 20 | WeeksBetween(datetime1, datetime2) | WeeksBetween(datetime1, datetime2)
Returns the number of weeks between two date-time objects. |
| 21 | YearsBetween(datetime1, datetime2) | YearsBetween(datetime1, datetime2)
Returns the number of years between two date-time objects. |