I originally posted this post on my blog.
Is it MM or mm for months when formatting dates? Is it "yyyy-MM-dd" or "yyyy-mm-dd"?
I always forgot which one to use...Until I figured out an easy mnemonic.
MM vs mm
Ask yourself: Which one represents a larger time frame? Months or minutes?
Since one month is larger than one minute, it's M for months. An uppercase m is larger than a lowercase m.
Write, anyDate.ToString("yyyy-MM-dd").
mm vs fff
Then, what is it for milliseconds? Isn't it mm?
Now, ask yourself: Which one is faster? One minute or one millisecond?
Since one millisecond is faster, write f.
Write anyTime.ToString("hh:mm:ss.fff").
Easy, peasy now!
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Good point.
Alas, I can't understand how date/time objects don't include a toShortIso() or something like that, producing the data in yyyy-MM-dd/hh:mm:ss formats.