05-23-2019
It is always best to always get in the habit of converting time text string (formatted time) to a unix timestamp (a number).
Then, format the timestamp(s) math results as needed.
It's always best in programming to separate the time functions and processing of time from the formatting of strings, because it is trivial to convert strings to timestamps and timestamps to formatted strings.
FYI, Just about every date stored in our database here at unix.com is a unix timestamp. We generally don't store formatted date strings in DB tables (unless of course the date is part of some text in a post).
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LEARN ABOUT PHP
date_sunrise
DATE_SUNRISE(3) 1 DATE_SUNRISE(3)
date_sunrise - Returns time of sunrise for a given day and location
SYNOPSIS
mixed date_sunrise (int $timestamp, [int $format = SUNFUNCS_RET_STRING], [float $latitude = ini_get("date.default_latitude")], [float
$longitude = ini_get("date.default_longitude")], [float $zenith = ini_get("date.sunrise_zenith")], [float $gmt_offset])
DESCRIPTION
date_sunrise(3) returns the sunrise time for a given day (specified as a $timestamp) and location.
PARAMETERS
o $timestamp
- The $timestamp of the day from which the sunrise time is taken.
o $format
-
$format constants
+-----------------------+-------------------------------------------+
| constant | |
| | |
| | description |
| | |
| | example |
| | |
+-----------------------+-------------------------------------------+
| SUNFUNCS_RET_STRING | |
| | |
| | returns the result as string |
| | |
| | 16:46 |
| | |
| SUNFUNCS_RET_DOUBLE | |
| | |
| | returns the result as float |
| | |
| | 16.78243132 |
| | |
|SUNFUNCS_RET_TIMESTAMP | |
| | |
| | returns the result as integer (timestamp) |
| | |
| | 1095034606 |
| | |
+-----------------------+-------------------------------------------+
o $latitude
- Defaults to North, pass in a negative value for South. See also: date.default_latitude
o $longitude
- Defaults to East, pass in a negative value for West. See also: date.default_longitude
o $zenith
- Default: date.sunrise_zenith
o $gmtoffset
- Specified in hours.
RETURN VALUES
Returns the sunrise time in a specified $format on success or FALSE on failure.
ERRORS
/EXCEPTIONS
Every call to a date/time function will generate a E_NOTICE if the time zone is not valid, and/or a E_STRICT or E_WARNING message if using
the system settings or the $TZ environment variable. See also date_default_timezone_set(3)
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.1.0 | |
| | |
| | Now issues the E_STRICT and E_NOTICE time zone |
| | errors. |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
date_sunrise(3) example
<?php
/* calculate the sunrise time for Lisbon, Portugal
Latitude: 38.4 North
Longitude: 9 West
Zenith ~= 90
offset: +1 GMT
*/
echo date("D M d Y"). ', sunrise time : ' .date_sunrise(time(), SUNFUNCS_RET_STRING, 38.4, -9, 90, 1);
?>
The above example will output something similar to:
Mon Dec 20 2004, sunrise time : 08:54
SEE ALSO
date_sunset(3).
PHP Documentation Group DATE_SUNRISE(3)