Time Functions
This section describes functions and operators for examining and manipulating TIME values.
Time Operators
The table below shows the available mathematical operators for TIME types.
| Operator | Description | Example | Result |
|---|---|---|---|
+ |
addition of an INTERVAL |
TIME '01:02:03' + INTERVAL 5 HOUR |
06:02:03 |
- |
subtraction of an INTERVAL |
TIME '06:02:03' - INTERVAL 5 HOUR |
01:02:03 |
Time Functions
The table below shows the available scalar functions for TIME types.
| Name | Description |
|---|---|
date_diff(part, starttime, endtime) |
The number of part boundaries between starttime and endtime, inclusive of the larger time and exclusive of the smaller time. |
date_part(part, time) |
Get subfield (equivalent to extract). |
date_sub(part, starttime, endtime) |
The signed length of the interval between starttime and endtime, truncated to whole multiples of part. |
extract(part FROM time) |
Get subfield from a time. |
get_current_time() |
Current time (start of current transaction). |
make_time(bigint, bigint, double) |
The time for the given parts. |
The only date parts that are defined for times are epoch, hours, minutes, seconds, milliseconds and microseconds.
date_diff(part, starttime, endtime)
| Description | The number of part boundaries between starttime and endtime, inclusive of the larger time and exclusive of the smaller time. |
| Example | date_diff('hour', TIME '01:02:03', TIME '06:01:03') |
| Result | 5 |
| Alias | datediff |
date_part(part, time)
| Description | Get subfield (equivalent to extract). |
| Example | date_part('minute', TIME '14:21:13') |
| Result | 21 |
| Alias | datepart |
date_sub(part, starttime, endtime)
| Description | The signed length of the interval between starttime and endtime, truncated to whole multiples of part. |
| Example | date_sub('hour', TIME '01:02:03', TIME '06:01:03') |
| Result | 4 |
| Alias | datesub |
extract(part FROM time)
| Description | Get subfield from a time. |
| Example | extract('hour' FROM TIME '14:21:13') |
| Result | 14 |
get_current_time()
| Description | Current time (start of current transaction) in the local time zone as TIMETZ. |
| Example | get_current_time() |
| Result | 06:09:59.988+2 |
| Alias | current_time (no parentheses necessary) |
make_time(bigint, bigint, double)
| Description | The time for the given parts. |
| Example | make_time(13, 34, 27.123456) |
| Result | 13:34:27.123456 |