datatypes: [Y, MO, D, H, MI, S] __datetime__ (…)

datatypes: [Y, MO, D, H, MI, S, errmsg] __datetime__ (…)

datatypes: […] = __datetime__ ('now')

datatypes: […] = __datetime__ ('today')

datatypes: […] = __datetime__ ('tomorrow')

datatypes: […] = __datetime__ ('yesterday')

datatypes: […] = __datetime__ (Y, MO, D)

datatypes: […] = __datetime__ (Y, MO, D, H, MI, S)

datatypes: […] = __datetime__ (Y, MO, D, H, MI, S, MS)

datatypes: […] = __datetime__ (X, 'ConvertFrom', dateType)

datatypes: […] = __datetime__ (…, 'Precision', precision)

datatypes: […] = __datetime__ (…, 'TimeZone', tzone, 'toTimeZone', totzone)

Base fuction for datetime class.