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If I have a random unix timestamp, how can I round it down to today's midnight or the midnight selected by the user. The reason for this is that I want to add hours and minutes after a certain day's midnight.
For example if the timestamp is 1324189035 then how can I remove the hours, minutes, and seconds to put the timestamp at midnight for that day.
567
Round time to nearest hour ( TIME(1,0,0) = 1/24 representing an hour) and add a zero time value to ensure the expression is cast as a Time. M: There isn't an equivalent of MROUND in M, so instead multiply the time by 24 to express it as a number of hours, then round, then divide by 24 and convert to a Time type.
Using a database querying tool, a midnight timestamp is treated as the start of the date, but in Clarity, it is interpreted as the day before if this timestamp is used for a Finish Date.
A few things you should know about Unix timestamps:Unix timestamps are always based on UTC (otherwise known as GMT). It is illogical to think of a Unix timestamp as being in any particular time zone. Unix timestamps do not account for leap seconds.
Unix time is the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970, excluding leap seconds. This time is named the Unix epoch, because it is the start of the Unix time. Unix time is not a true representation of UTC, because leap seconds are not independently represented.
echo date('d-m-Y H:i:s', strtotime('today', 1324189035));
Because of how you're using it, I wouldn't calculate midnight at all: it is far easier to simply convert what you're adding to the timestamp into 24 hour time and then use strtotime:
echo strtotime("0:00",1324189035); // 1324184400
echo strtotime("17:50",1324189035); // 1324248600
And if you want to have that in human readable, use date and m/d/Y H:i:s:
echo date('m/d/Y H:i:s', strtotime('17:50',1324189035)); // 12/18/2011 17:50:00
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