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Note that microsecond comparisons are not well supported with MySQL, since MySQL does not store microsecond information. Only adding and subtracting timedeltas is supported, attempts to use other operations raise a TypeError. cCs‘t|ƒdkr!tdƒ‚nt|dtjƒsFtdƒ‚n||j|jfkrqtd|ƒ‚ntt|ƒj |||ƒdS(Nis$Must specify a node and a timedelta.is!Second child must be a timedelta.s Connector must be + or -, not %s( R R RRRR$R'R RR (R RRR((s5../Django//lib/python/django/db/models/expressions.pyR ĪscCs|j|||ƒS(N(tevaluate_date_modifier_node(R RR!R"((s5../Django//lib/python/django/db/models/expressions.pyR#­s(RCRDRER%R R#(((s5../Django//lib/python/django/db/models/expressions.pyRŠs (Rt django.utilsRtNodeRRFR(((s5../Django//lib/python/django/db/models/expressions.pyts s