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How to set a default value for a datetime column to record creation time in a migration?
...
This is supported now in Rails 5.
Here is a sample migration:
class CreatePosts < ActiveRecord::Migration[5.0]
def change
create_table :posts do |t|
t.datetime :modified_at, default: -> { 'CURRENT_TIMESTAMP' }
t.time...
How to obtain the start time and end time of a day?
... // Represents an entire day, without time-of-day and without time zone.
.now( // Capture the current date.
ZoneId.of( "Asia/Tokyo" ) // Returns a `ZoneId` object.
) // Returns a `LocalDate` object.
.atStartOfDay( // Det...
Why does datetime.datetime.utcnow() not contain timezone information?
...e like this
import pytz # 3rd party: $ pip install pytz
u = datetime.utcnow()
u = u.replace(tzinfo=pytz.utc) #NOTE: it works only with a fixed utc offset
now you can change timezones
print(u.astimezone(pytz.timezone("America/New_York")))
To get the current time in a given timezone, you could...
Override Java System.currentTimeMillis for testing time sensitive code
...than manually changing the system clock on the host machine?
Yes.
Instant.now(
Clock.fixed(
Instant.parse( "2016-01-23T12:34:56Z"), ZoneOffset.UTC
)
)
Clock In java.time
We have a new solution to the problem of a pluggable clock replacement to facilitate testing with faux date-ti...
Convert datetime object to a String of date only in Python
...
use t = datetime.datetime.now() to use current date
– gizzmole
Jul 17 '17 at 18:36
...
Can't subtract offset-naive and offset-aware datetimes
...L. When I pull data from the table, I then want to subtract the time right now so I can get it's age.
10 Answers
...
How do you convert a JavaScript date to UTC?
...
Simple and stupid
var date = new Date();
var now_utc = Date.UTC(date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate(),
date.getUTCHours(), date.getUTCMinutes(), date.getUTCSeconds());
return new Date(now_utc);
...
How to add 30 minutes to a JavaScript Date object?
....
* Example: dateAdd(new Date(), 'minute', 30) //returns 30 minutes from now.
* https://stackoverflow.com/a/1214753/18511
*
* @param date Date to start with
* @param interval One of: year, quarter, month, week, day, hour, minute, second
* @param units Number of units of the given interval...
Calculating the difference between two Java date instances
...lass in Scala and want to compare a Date object and the current time. I know I can calculate the delta by using getTime():
...
Insert current date in datetime format mySQL
...YSQL's functions.
mysql_query("INSERT INTO `table` (`dateposted`) VALUES (now())");
If you need to use PHP to do it, the format it Y-m-d H:i:s so try
$date = date('Y-m-d H:i:s');
mysql_query("INSERT INTO `table` (`dateposted`) VALUES ('$date')");
...