Example
Sometime you will need to know, with 2 dates objects, if there are corresponding to the same date, or find which date is after the other.
In Go, there is 4 way to compare dates:
date1 == date2, returnstruewhen the 2 are the same momentdate1 != date2, returnstruewhen the 2 are different momentdate1.Before(date2), returnstruewhen the first is strictly before the seconddate1.After(date2), returnstruewhen the first is strictly after the second
WARNING: When the 2 Time to compare are the same (or correspond to the exact same date), functions
AfterandBeforewill returnfalse, as a date is neither before nor after itself
date1 == date1, returnstruedate1 != date1, returnsfalsedate1.After(date1), returnsfalsedate1.Before(date1), returnsfalse
TIPS: If you need to know if a date is before or equal another one, just need to combine the 4 operators
date1 == date2 && date1.After(date2), returnstruewhen date1 is after or equal date2
or using! (date1.Before(date2))date1 == date2 && date1.Before(date2), returnstruewhen date1 is before or equal date2 or using!(date1.After(date2))
Some examples to see how to use:
// Init 2 dates for example
var date1 = time.Date(2009, time.November, 10, 23, 0, 0, 0, time.UTC)
var date2 = time.Date(2017, time.July, 25, 16, 22, 42, 123, time.UTC)
var date3 = time.Date(2017, time.July, 25, 16, 22, 42, 123, time.UTC)
bool1 := date1.Before(date2) // true, because date1 is before date2
bool2 := date1.After(date2) // false, because date1 is not after date2
bool3 := date2.Before(date1) // false, because date2 is not before date1
bool4 := date2.After(date1) // true, because date2 is after date1
bool5 := date1 == date2 // false, not the same moment
bool6 := date1 == date3 // true, different objects but representing the exact same time
bool7 := date1 != date2 // true, different moments
bool8 := date1 != date3 // false, not different moments
bool9 := date1.After(date3) // false, because date1 is not after date3 (that are the same)
bool10:= date1.Before(date3) // false, because date1 is not before date3 (that are the same)
bool11 := !(date1.Before(date3)) // true, because date1 is not before date3
bool12 := !(date1.After(date3)) // true, because date1 is not after date3
