| m0=: 6!:0 | System time stamp yyyy mm dd hh mm ss (argument y needed but ignored) |
| m1=: [:<._3:{.] | hh mm ss part of time stamp |
| m2=: 1000"_ #. ] | Base-1000 form of y |
| m3=: (':'"_) _6 _3} ": | Format with ':' between fields |
| m4=: [:<.3:{.] | yyyy mm dd part of time stamp |
| m5=: ('/'"_) 4 7} ": | Format with '/' between fields |
| m6=: [: m3 [: m2 [: m1 m0 | Formatted time stamp hh:mm:ss |
| m7=: [: m5 [: m2 [: m4 m0 | Formatted date stamp yyyy/mm/dd |
| m8=: (':'"_) 2 5} [: ": 1000"_ #. _3: {. [: <. m0 | Formatted time stamp hh:mm:ss |
| m9=: ('/'"_) 4 7} [: ": 1000"_ #. 3: {. [: <. m0 | Formatted date stamp yyyy.mm/dd |
| m10=: 100"_#.100"_|3:{. m0 | yymmdd from ccyy mm dd (y neglected) |
| m11=: 0: ~:/ .= 4 100 400"_ |/ ] | Is y a leap year? |
| m12=: 28"_ + m11@] | Number of days in February of year y |
| d13=: 31"_ - 2: | 7: | [ | 31 - 2 | 7 | x: days in month x, not = 1 |
| d14=: d13`m12@.([=1:) | Number of days in month x of year y |
| m15=: ('0123456789 '"_ i.[:":[:|. 3: {. 6!:0) { ('0123456789.'"_) | Current date in dd.mm.yy fmt, neglect y |
| m16=: ((12"_ <: {.),2:) { 'apm'"_ | am or pm depending on first atom of y |
| m17=: ([: m3 m2) , (' '"_ , m16) | Formatted 3-atom time y in 'm' form |
| m18=: [:":[:(1:|.])100"_|[:m4 m0 | Formatted date in mm dd yy form |
| m19=: '/'"_(]#[:i.#)@(' '"_=])}] | Replace blanks in y by '/' |
| m20=: m19@m18 | Formatted date in mm/dd/yy form |
| m21=: >:@(365&* + m22)@(-&1601) | # of New Year’s Day, Gregorian year y; m21 1601 is 1 |
| m22=: -/@:<.@(%&4 100 400)"0 | # of leap days in y years (Clavian corr.) |
| m23=: 7&|@m21 | Day of week year y begins (0=Sunday)
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